We have classified the 50 complaints from 2018 Honda Accord about VEHICLE SPEED CONTROL into the following categories.
Car on a straight road, no adverse weather conditions. the collision mitigation braking systems shuts down. this has occurred during both day and night time and has happened six times. the radar panel was not obstructed. the cmbs can only be reset by stopping and restarting the car. i have contacted the manufacturer's customer support with no resolution. i have contacted at least two dealer service centers with this problem, no resolution. they say they need to see the error code - problem is, the warning resets when the car is restarted. this problem has been reported by other customers on the car complaints website. most recent occurrence was on 06 feb 2020. the cmbs has shut down at different mileages, both in and out of the cars warranty.
The collision mitigation braking system and adaptive cruise control system has thrown an error and stopped working 5 times now. it has happened to me on long road trips on the highway at speeds of 50+ mph. it has happened less than 30 minutes after starting the vehicle and sometimes after 2+ hours of driving. the weather conditions have ranged from cloudy to fine (no snow or rain). this is extremely dangerous to have happen at highway speeds in traffic.
While driving on highway at 65 mph with cruise control on brakes suddenly applied themself nearly causing a vehicle to strike me in the rear .several alarms were displayed on dash first was adaptive cruise control second collision mitigation braking system third departure mitigation system problem all alarms said to see your dealer . i took pictures with my cell phone of all alarms displayed but i'm having difficulty uploading to report . i can send a attachment specific to the claim if needed or if a email could be given i would forward such.
Under certain driving conditions when the car is slowing down while using acc (cruise control) the system will fail causing the brakes to disengage.ever time this happens 3 times so far i was driving at the posted speed limit. most time the speed limit was 55 mph. traffic went from posted limit to an almost complete stop.the car would start to slow down then the system would fail, allowing the car to continue forward almost causing a collision. the message "collision mitigation braking system problem see your dealer" is displayed. honda has a tsb 19-051 that talks about the issue. when i took the car to dealership about issue they refused to do the tsb.
Collision mitigation system does not work; initial issue was warning systems went on with no one in front of car. second time brakes were applied to vehicle with no one in front of car, leading to car induced panic stop on road, thankfully, no one was trailing my car at that time. honda test drove and could not find anything; since this is sporadic, this was not surprising. told them it is a very dangerous condition and that this is a well documented complaint on websites; they told us we can turn off front mitigation collision system each time we drive. requested dealership general manager to report this condition to regional director at honda
Adaptive cruise control (acc) fails during use, the vehicle can automatically accelerate to a set speed and slow down when it senses a vehicle within a close proximity. when the acc is active and after a few times of needing to automatically slow down when another vehicle is in front of the vehicle, the system shuts down and an error message appears, " collision mitigation braking system problem. see your dealer". i've taken the vehicle to the dealer and there was no fix to the problem, my vehicle is still currently under warranty and i was disappointed that there was no fix to this problem. the date listed below was the most recent date that the same incident occurred, i took the vehicle in to south motors honda dealer back in 2018 shortly after purchasing the vehicle.
Multiple errors involving vehicle's collision mitigation braking system (cmbs). cmbs system fails regularly (approximately every 120 miles of driving) during routine use at freeway speeds. system failure shuts down adaptive cruise control (acc), collision mitigation braking system (cmbs) and displays error to "see your dealer".
Collision mitigation, lane assist, road departure, and brake system malfunction before vehicle is a year old causing vehicle to leave roadway when using speeds in excess of 50 mph preventing vehicle from stopping, and/or causing steering wheel to "alert" you of lane departure while driving properly also causing vehicle to "steer" into side of 18 wheeler while traveling speeds in excess of 60mph for interstate travel with passengers in tow. has happened for roughly 7,000 miles. when brought to honda to be fixed, was told it was not covered under vehicle warranty due to having "clips" broken off of front sensor. was accused of sensor being hit by something yet no sign of damage. honda refused to have this fixed and simply "cleared" the alerts causing vehicle to not have use of any safety features but also not show any maintenance codes as well. honda service manager stated something as simple as a "junebug" can cause this to malfunction and that is why customers carry collision with insurance. states alot about honda's quality if a simple junebug can cause an entire $30,000 vehicles safety features to malfunction and a service manager not want to comply with safety standards due to some 2$ broken clips that can break by simply driving down a louisiana roadway. what does this state about these vehicles up north dealing with snow with a sensor that sits underneath the front bumper?
The collision mitigation system and adaptive cruse control (acc) has on two occasions turned off at highway speed - potentially dangerous situation if you are depending on the system to regulate your speed in traffic. the car must be stopped and restarted to reactivate the system. also, the system at times applies braking when there are no other cars or other obstacles in it's line of sight. this also seems to happen (not always) when overtaking a tractor trailer at highway speed. i have researched this problem on the internet and other honda owners have experienced the same issue, typically with the dealer not being able to find a problem. apparently the error codes reset when the car is restarted.
Active cruise control (acc) failed while driving approx. 40 mph. approaching the vehicle ahead of me which was rapidly slowing/stopping, the acc failed to slow my vehicle which forced me to manually apply hard braking at the last moment to avoid a collision. when i looked down there was an error message on my instrument cluster which read "collision mitigation braking system problem. see your dealer". the weather at the time was clear and 62 deg. f, and the vehicle was clean with no dirt nor obstructions on the front radar unit nor the windshield (camera area). the acc could not be restarted until i pulled the car over and shut it down/restarted it, which then cleared the error message and enabled me to reinitiate the acc system. this is a significant safety defect!
On 2018 honda accords the adaptive cruise control which is standards on all trim levels, does not brake the vehicle to maintain the set speed when going downhill. this is odd since the vehicle will apply brakes to maintain speed if there's a vehicle in front of the car, but on downhills all it will do is make several downshifts to try and maintain the speed. every other car i've driven that has adaptive cruise control will apply brakes to keep the vehicle speed from increasing in an uncontrolled manner. of course if you tap the brakes yourself cruise control is disabled. a simple software update would resolve this issue.
Tl* the contact owns a 2018 honda accord. the contact stated that the brake pedal was extremely difficult to depress because of the placement of the accelerator pedal. the situation impacted the contact's driving ability. honda city (3859 hempstead turnpike, levittown, ny 11756, (516) 717-4762) was contacted and unable to provide a remedy. the vehicle was not repaired. the manufacturer was notified. the vin was not available. the approximate failure mileage was 0. *js *js *js *js *js
The collision mitigation braking system warning light comes on intermittently. i have to stop the car turn it off and turn it back on in order to reset the warning light. the dealer tells me this is a known problem but they don't have a fix the light has come on in all types of driving conditions, clear and dry, rain, etc.
I engaged acc, that controls cruise control and frontal collision ,mitigation system, in normal traffic. while travelling at a speed of 60 miles per hour, following another car the spacing was controlled by acc. the car in front of me continued forward, my braking system engaged and caused me to go from 60 mph to about 35 mph. the vehicle to my rear had to take an evasive maneuver to avoid an accident. i saw no road debris. i pulled over to check the radar unit and the camera system. no issues observed. during this trip the acc went offline 3 times down to sc and twice it failed driving back home. each time i was in traffic and caused issues as the system was trying to manage my speed in traffic.
Cmbs problem... was driving on the highway yesterday when the "collision mitigation breaking system" light came on and that disabled the acc i was using. nothing particular happened, maybe i was braking at the time. i arrived at destination. turn the car off and back again right away to see the warning light disappear and everything back to normal. i thought i was ok but it happened few hours later on the way back in the same circumstances.
On 2/14/19, i was driving on a city street in a straight line at approximately 40mph. the car ahead of me stopped. i stepped on the brake and instantly the dashboard warnings lit up - adaptive cruise control, collision mitigation braking system, road departure mitigation system, and the brake - and the brake did not work so i could not stop. i rear-ended the car in front of me doing significant damage to the front of my car. the warnings were still visible after the crash and i took pictures of the dashboard as best as possible. the warnings say something about system not working and to see a dealer. the same warnings appeared on 2/13/19 in the afternoon but disappeared on 2/14/19 in the morning. other warnings of safety systems not active have appeared due to ice/slush but then cleared when the sensors were cleared, but these new warnings are different. at least twice, maybe three times in the past few months, the car would suddenly brake and slow down with nothing in the road or in front of the car. my bluetooth connectivity worked fine for first 2-3 months but then stopped and i couldn't reconnect the phone over the past two months. it seems like more than one system/electronics problem and seems like the warnings appeared at the same time as the brake not working as if it was more than an alert but a system (systems) no longer functioning at all. the brake worked after the accident when the car was restarted.
My collision mitigation system randomly fails which pops up an alert and disables my adaptive cruise control and automatic braking. it has happened various times when adaptive cruise control has been engaged with different environemental situatuons (day and night, sunny and cloudy). turning off the engine and restarting typically corrects the issue for a time but it continues to fail intermently.
Car is 2 weeks old and i've had the cmbs which controls the autobraking and adaptive cruise control go off 4 times with the failure warning and to see the dealer for inspection. each time was under a different set of environments including at night, a cloudy day, rain, and sunny. it seems to fail within 10 mins of the first time the adaptive cruise is set. the green light that indicates the system is working goes off and turns to orange. i've contacted the dealer for repair but online searching shows both dealers and honda do not have a fix.
Vehicle running, both driving and stationary, dash indicated three warnings: "adaptive cruise control system problem", "collision mitigation braking problem", "road departure mitigation problem". all three systems were nonfunctional. dealer advised to drive through a car wash before coming in for repair. the car wash appears to have worked, but this is absurd! every time it rains or car is dirty, the safety features don't work? didn't see this disclosure when i bought the car or when i paid for these features.
Leased 2018 honda accord in october, 25 miles later had checked engine light on,took it back to the dealer,emission hose wasn't attached properly. after 900 miles the wheel alignment went out ( i did not hit any pot holes) took it back to the dealer, according to the dealer one the rod wasn't set right, now it's january 2019 and have 4000 miles yesterday the car started to supporter and all the warning started flashing auto high beam, adaptive cruise control, collision mitigation, road departure mitigation....all this sing said see your dealer..guess what i called the dealer first thing this morning..today is january 24 2019 still waiting to hear from the dealer all this technology is totally useless... i had 2002 honda accord with 310,000 miles and no technology
Collision mitigation braking system problem,car brakes by its self ,was driving at 75mph and car slamed on brakes to 35 on us 71 almost caused an accident. also monitor on dash that has home ,nav,audio settings shuts off by its self and reboots.braking problem happens on cruise control and normal driving. i photo the dash 5 times when collision mitigation went off in a 5000 mile period .
In the states where it snows, the car collects large amounts of snow on the front, and knocks out the radar system for the lane departure detection system, witch also is for the braking system, that helps with cruise control and any close encounters. i am not sure if it actually affects the cruise control because in the snow is not a time to use it.
Collision mitigation braking system activated for no reason, on surface roads and highway speeds, vehicle slammed on brakes automatically, there is nothing on the road in front of the car. this has occurred numerous times. dealerships told me that there was no registration in the warranty system because they were unable to fix the problem so no record of this problem was sent to honda usa.
Tl* the contact owns a 2018 honda accord. the contact stated that the brake pedal was too close to the accelerator pedal. when the contact lifted his foot off the accelerator pedal, the bottom of his foot came in contact with the brake pedal. the vehicle was taken to honda city long island (located at 3859 hempstead turnpike, levittown, ny 11756, (516) 717-4762) where it was inspected, but not test driven. the vehicle was not repaired. the manufacturer was notified of the failure and informed the contact to take the vehicle to another dealer. no further assistance was offered. the approximate failure mileage was 23,000.
Collision detection system failed, works fine after restart. issue occurs every 70 miles and requires a restart to fix.
Since the vehicle reached approximately 5000 miles, i had a massive safety failure of the "honda sense" system shutting down, hazard & turn signals inoperative, power locks inoperative, brake system warning light on, loss of auto headlights and information screen. vehicle was taken to the dealrship and they retrieved trouble code which is a "mystery code" that honda does not know why its occuring .... radar told car to accelerate when vehicle was not in motion u0401-92 along with 3 other codes. dealership showed me printout from computer but customer receipt said reset system only and did not list out trouble codes (4 codes retrieved) vehicle now stops intermittently while driving at highway speeds, pulls itself out of the lane while driving, and apple car play system no longer will recognize iphones (tried multiple) and dealer has verified issue but just resets. infotainment screen lost power and set warning message for same when dropped off again at dealership 2/26/19. dealer in florida also had car, said nothing wrong, could not duplicate and vehicle never left dealership and carplay did not work after they claimed it was fine. also found that entire system was reset and rebooted, causing loss of all settings and stored information/stations....why reboot if its working? vehicle now being driven with honda sense system off due to fear of collision or accident caused by vehicle and not driver. this vehicle is now unsafe to drive. multiple complaints about vehicle braking on its own, flashing "brake" warning to driver when no car in front ... happens local and highway driving now intermittently. vehicle has been in dealerships approximately 4-5 times since inital electrical failure 12/24/19. email contact and several phone calls to hma already. original electrical failure happened 12/23/28 and i have been dealing with since. also have snapshots
The collision mitigation braking system has completely failed twice on my month old 2018 honda accord. when this fails, the cruise control is also deactivated. both times the car was in motion with the adaptive cruise control active.
As i was pulling out the garage from the san francisco international airport heading towards the highway to san francisco the miles per hour is 30 entering and then 65 mph when you get on highway. the dash board indicates the wrong miles for speed it said 100 mph. it stayed like that for more than 5 mins. i already had a previous situation with this vehicle where the braking systems engaged as i was on highway in 05/13/2018, and almost caused my life and others behind me, there was significant damage from being rear ended and over 18k worth of damage but honda dealer keep saying nothing was found faulty! i had them turn 'off' all safety modes cause i'm afraid it will happen again but it keeps coming back 'on'. it yanked me several times when no other car is around me. the braking light appeared several times already since i got it back, and it's like they don't believe you. now after all this i'm stuck with a faulty car i'm really thinking about getting a lawyer on this. and my speakers seem not to be right either the sounding is very low compared to when i got it. only 2000 miles and this car been a pain . physically and mentally! and did i mention that my airbags didn't work from first incident i reported. after car was crushed in from being hit from behind . nope they failed too.
I live in rochester ny and even with very light snow that is not even collecting on the roadway i get an urgent notification that crash avoidance and any radar based safety systems are compromised and not available at this time. this is due to the radar unit being interfered with snow collection as it is in the shape of a square cup and it collects snow like a scoop. there is no heating element on the unit at all to keep it clear of snow and it's location is such that it is rendered totally useless in any snow what so ever. bmw, mercedes and audi all either have hidden their units behind items that are heated for northern climates or the radar unit itself is gently heated below a particular temperature to avoid loosing all safety systems. this is simply not acceptable in a modern car and i would ask nhtsa to look into with honda recalling all northern cars to change the radar unit to a heated version or to relocate it behind an emblem or something that doesn't collect snow like a scoop. it is a very poor design and impacts all distance and crash avoidance systems present on the vehicle. this is a 2.0 touring edition with every available option so it is not for a lack of spending money for safety that's for sure. the dealer said they have received many complaints about this same issue and are telling people it's made that way and frankly the sensor should be heated in northern climates. nice!
Adaptive cruise control(acc) stops working with error "collision mitigation braking system problem. see your dealer."i was driving on interstate at 60mph with acc on and suddenly the error pops out. error goes way when you restart the car. but repeats again intermittently. you cannot use acc again until you restart the car.
Automatic emergency braking took car from 60 to 0 on highway (route 65n in nashville). luckily no one was behind me (it was 6am) or i could have been rear-ended. i could not accelerate or control the car at this point and came to a complete stop. this is the second time this has happened in the last month. this turns a touted safety feature into a hazardous feature. planning on a dealer visit this friday
While driving with the cruise control on the collision mitigation and braking system will intermittently turn off and disable the cruise control. dealer says nothing is wrong, claim the sensors are overloaded. this can happen on bright sunny days, cloudy days and at night. sensor on front of car is clean; no bugs, smears or liquids. will reset with a stop/start of the engine. code check revealed. uo401-53 temporary stop of integrated driver support system -- received stop request by pgm-fi system. error code 401-93 temporary stop of integrated driver support system -- received stop request by pgm-fi system. this happens only when the cruise control is on and moving. this has happened at least 12 times in the past 8 months, most recent was today.
Two separate issues: 1) with only 2,400 miles on the accord, on october 7, 2018 it suddenly lost power 2 or 3 times over a 60-mile stretch of the busy 405 freeway, each time slowing from 65 mph to approximately 30 mph or less despite maintaining even pressure on the accelerator. the car did not respond to pressure on the gas pedal. no cruise control was used at any time. the sudden deceleration could have caused a serious accident. 2) on november 30, 2018, i attempted to resume motion after stopping for a red light. the accord's gas pedal failed to respond for approximately 5 to 6 seconds, then suddenly lurched forward. this also could have caused a serious accident.
Failure of front crash mitigation, lane deparure mitigation system while car is moving. sudden deceleration from engine to electric at highway speeds.
Driving my new 2018 accord ex-l 2.0 in the left lane on i65 going south toward lafayette in on friday october 5. there were two southbound lanes. conditions were wet but it was not raining hard at the time. had acc and other safety features on. was passing a semi (that was going about 70-71 mph) at about 75 mph when a car came up behind me going much faster than me. i accelerated to move in front of the truck and immediately lost all acceleration. the small yellow check engine light came on and i was steadily losing speed. i maneuvered over to the right shoulder going about 50. had to keep the engine revved at 3000 rpm and still was steadily losing speed while driving on the shoulder. eventually pulled off at the first exit after about 2 miles on the shoulder and was going about 15 mph at the time. turned off the car, waited for a few minutes, and started it up. it drove fine and the engine light stayed off. i had my wife and two daughters in the car. we easily could have caused an accident on a busy two-lane interstate with many semis. dealer says there are no codes to check from the cel and that all hoses, etc are connected and that the car is fine. it wasn't fine when it lost power on the highway. i suspect an electrical problem or something with the fuel pump.
While driving at highway speeds with acc (adaptive cruise control) enabled and lkas (lane keep assist) enabled and passing a car and another time an 18 wheel truck, the car suddenly and abruptly braked to slow down 5 mph. the road was straight and no cars were in front of me. this was a very dangerous situation because cars were behind me and they all had to react to slow down. t
Monday september 24th, 2018, i was traveling on u.s. highway 19 and a vehicle turned off about a half mile ahead of me while i had the cruise control engaged. the vehicle had completely cleared the road and my car slammed on brakes causing everything in the vehicle to be thrown into the floorboard. had there been a car behind me, the car would have rear-ended my vehicle. there continues to be an issue where the sensor recognizes something in the road that is not there or a vehicle that has already cleared the road and slams on brakes. this creates a serious safety issue and is damaging on the brakes. i do not feel safe driving with this system engaged because i do not know when the vehicle will slam on brakes causing other drivers to rear-end me.
Collision mitigation breaking system fails during operation of adaptive cruise control. the vehicle will no longer verify if a collision is going to happen, and can cause the vehicle to collide with a forward vehicle.
2018 honda accord exl. 1565 miles on odometer. weather was sunny and 89f. i was driving vehicle on the interstate at approximately 65 mph with acc and lkas activated but being closely monitored as this feature is new to me. as the traffic was slowing down ahead the instrument cluster displayed "collision mitigation braking system problem. see your dealer" error message. i had to quickly apply the brakes to avoid a collision with the car in front of me. in the process of notifying dealership to seek out a solution. very worried about this as a system designed to prevent front collisions almost caused one!
Tl* the contact owns a 2018 honda accord. the contact stated that the vehicle went into limp mode and the engine warning indicator randomly illuminated. the vehicle experienced a loss of power more than twice while making a turn and driving highway speeds. the contact had to coast the vehicle over to the side of the road, and shut off and restart the vehicle. waikem honda (3910 lincoln way e, massillon, oh 44646, (330) 477-5002) was unable to duplicate the failure or locate a diagnostic trouble code. the dealer and manufacturer technician test drove the vehicle, but found no failure. the vehicle was not repaired. the manufacturer was notified. the approximate failure mileage was 4,000 and a second time around 7,300 miles.*bf consumer stated when the goes into "limp mode" and i cannot accelerate. if i were in the left lane passing a semi, i could visualize this a fatal accident. i am anticipating another "limp mode" soon as i have just over 11,000 miles and it seems to happen about every 3 to 4,000 miles. *jb
Wife was driving on interstate in the left hand lane about 75 mph when a yellow light appeared on the dash and car lost engine power. wife is unsure which yellow light came on due it happening so fast. she coasted across three lanes and made it to the shoulder. car was towed to dealer and they cannot find anything wrong with it. there is 700 miles on the car. dealer said it may have been road debris that caused collision mitigation braking system to take control of the car but nothing was recorded in the edr unit. very unsafe.
I have revcieved the "collision mitigation braking system problem" multiple times. i have taken it to the dealer and they adjusted the brake and did a software update but i continue to get the same problem.
Immediately after purchasing the vehicle in charleston, sc, i made a trip to atlanta. during the round trip i noticed on several occasions after making a stop, such as at a traffic light, when the light turned green and i pressed the accelerator there was no response. after 4 or 5 seconds the engine accelerated at such a rate that it was difficult to control. i knew that this problem was potentially very dangerous. in fact, i told my wife that she should never drive the car until this problem was resolved. after returning home from atlanta i took my car into the service department at rick hendricks's honda in charleston, sc where i purchased the car. i explained the problem to the service technician and after several hours he told me that they had tested the car and that the problem i had was inherent to this accord and i would have to live with it. he told me that i had been driving the car in econ mode and that this problem would not happen if econ mode was 'off'. so, i turned econ mode 'off' and began driving the car off the dealer lot and when i stopped at the first stop sign and then began proceeding, there was no response when i pressed the accelerator. i refuse to accept the fact that i have purchased a new car and have to live with a defect that the dealer says 'it is just the way your 2018 honda accord works'. i am driving an automobile that potentially might cause injury to myself, passengers in my car, and other vehicles as well.
All honda sensing lights goes off and see the dealer message shown on screen.
On 3 seperate occasions the car has seen a shadow on the ground and slammed on brakes then releasing for no reason. there were no other vehicles around me on each occasion. i thought the car was stopping on a yellow light on the first incident but was told by the service manager that it doesn't do that. this is a very dangerous issue that needs to be addressed. i asked the service manager to disable it but was told he can't do that when it is possible because this is an added feature.
2.0 turbo : delay in acceleration when accelerator is depressed nhtsa # apas02142018901, item #10129330
I have had several occurrences of a warning that states "collision mitigation braking system problem. please see your dealer." this error message will pop up randomly with no pattern while using the advanced cruise control function on my vehicle. while this error is present i am not able to use any kind of cruise control settings. i was have seen my local honda dealer about this issue multiple times and have been given many horrible solutions. i have been told to just pull the vehicle over and restart it to clear the errors out. i have also been told by my local dealership that the camera is just dirty and that i need to carry a bottle of water and a rag to wipe off the windshield anytime it happens. i have tried both of these solutions several times and neither has worked. in fact every time i attempt to turn off and restart my vehicle i have eight other safety system failure messages that populate.
Tl* the contact owns a 2018 honda accord. while driving 70 mph with the adaptive cruise control function engaged, the vehicle decelerated. the contact stated that the failure recurred several times. the contact stated that the instrument cluster blacked out on several occasions. the vehicle was taken to zimbrick honda (located at 1601 w beltline hwy, madison, wi 53713, (608) 273-2555) to be diagnosed, but the mechanic was unable to retrieve a fault code or duplicate the failure. the vehicle was not repaired. the manufacturer was contacted. the approximate failure mileage was 2,000.
I have a 2018 honda accord 2.0t touring. i have numerous incidents where the collision mitigation braking system has gone out giving an amber dash warning to see the dealer. this has happened 6 times all when the adaptive cruise control was engaged. it also disabled the cruse control. all 6 times i was driving on the interstate. the road was flat and straight and it was a clear sunny day with no other car in the vicinity .the radar unit and camera were free of bugs. most times, upon shutting off the car and restarting everything returns to normal. however, one time upon restarting the car the phone ,radio navigation, adaptive cruse control, cruse control and collision mitigation braking system would not come back and i had to take the car to the dealer. this car was taken to honda of el cajon, ca on 4/21/18 and chapman honda, az on 7/31/18 and 7/3/19. no problem was found all 3 times
Three times during the first 1500 miles the collision mitigation braking system has failed, disabling that feature and adaptive cruise control, displaying a large diagnostic on the electronic dashboard and telling me to see my dealer. in all cases i was driving in normal traffic on northern california freeways at cruising speed (twice on 101, once on 80). the first two failures occurred during daytime, the third at night. the weather in all cases was normal (no rain, snow, mud, ...) .when i visited the dealer after the first two occurrences (when the car is turned off and then back on the condition clears) the dealer found no diagnostic codes or other problems. then the problem occurred a third time. the dealer and honda corporate say they have no idea how to fix it because of the absence of diagnostic codes.