Got abs & tcs lights and either "traction system active" or "service traction system". two dtc codes c0036 & c0245. ck'd left wheel sensor per buick service manuals by disconnecting connector at wheel hub & ck'd ok. no problem again for more than a year. recently got same lights abt & tcs and master light (ck traction system). also, concurrent got a thumping sound from left front of vehicle over bumps & when applying brakes. also, when turning left/right the abs pump would turn on (felt thru steering wheel). scan tool confirmed left wheel solenoid activated during test drive. ck'd the front wheel sensors ac voltage out put per buick service manuals & found left wheel sensor output at 150 mvac and right wheel sensor at 120mvac for "approx" same wheel speed; spec is 100mvac when "spinning wheel" (no speed of wheel in spec!). other sensor cks (open, shorts to ground, short to voltage, shorted together) all ok. during long trip (400miles) problem (abs,tcs, etc) lights never came on. problems that occurred during local/short trips totally went away during long trip???? sooooo what to do??? plan to change left front wheel hub as thumping in front end during braking (bearings?) hasn't gone away. *tr
Tl* the contact owns a 2002 buick rendezvous. the contact stated that the traction control warning light would sporadically illuminate. the vehicle was inspected by a dealer and they advised that the failure was non-repairable. yet, advised that if the failure was not repaired, the brakes would eventually fail. the manufacturer was contacted and they advised that there were no recalls for the vehicle. the failure mileage was unknown. the vin was unavailable. updated 06/17/11*lj updated 06/27/11
Anti-lock brake sensor failed which caused excessive movement in the brake pedal when stopping. in addition, this sensor caused the traction control system to disengage and created difficulty in stopping the vehicle. in some instances the brake pedal would depress all the way to the floor of the vehicle when attempting to stop. buick would not honor the warranty on this part. as a result, i paid $700 for the repair on this part. *tr