2020 Jeep Grand Cherokee Owners Manual - TRAILER TOWING

TRAILER TOWING

In this section you will find safety tips and information on limits to the type of towing you can reasonably do with your vehicle. Before towing a trailer, carefully review this infor- mation to tow your load as efficiently and safely as possible.

To maintain the New Vehicle Limited Warranty coverage, follow the requirements and recommendations in this manual concerning vehicles used for trailer towing.

Common Towing Definitions

The following trailer towing related definitions will assist you in understanding the following information:

Gross Vehicle Weight Rating (GVWR)

The Gross Vehicle Weight Rating (GVWR) is the total allow- able weight of your vehicle. This includes driver, passengers, cargo and tongue weight. The total load must be limited so that you do not exceed the GVWR. Refer to “Vehicle Loading/Vehicle Certification Label” in “Starting And Operating” for further information.

Gross Trailer Weight (GTW)

The Gross Trailer Weight (GTW) is the weight of the trailer plus the weight of all cargo, consumables and equipment (permanent or temporary) loaded in or on the trailer in its "loaded and ready for operation" condition.

The recommended way to measure GTW is to put your fully loaded trailer on a vehicle scale. The entire weight of the trailer must be supported by the scale.

Gross Combination Weight Rating (GCWR)

The Gross Combination Weight Rating (GCWR) is the total allowable weight of your vehicle and trailer when weighed in combination.

Gross Axle Weight Rating (GAWR)

The Gross Axle Weight Rating (GAWR) is the maximum capacity of the front and rear axles. Distribute the load over the front and rear axles evenly. Make sure that you do not exceed either front or rear GAWR. Refer to “Vehicle Loading/Vehicle Certification Label” in “Starting And Operating” for further information.

Tongue Weight (TW)

The Tongue Weight (TW) is the downward force exerted on the hitch ball by the trailer. You must consider this as part of the load on your vehicle.

Trailer Frontal Area

The frontal area is the maximum height multiplied by the maximum width of the front of a trailer.

Trailer Sway Control

The Trailer Sway Control (TSC) can be a mechanical tele- scoping link that can be installed between the hitch receiver and the trailer tongue that typically provides adjustable fric- tion associated with the telescoping motion to dampen any unwanted trailer swaying motions while traveling.

If equipped, the electronic TSC recognizes a swaying trailer and automatically applies individual wheel brakes and/or reduces engine power to attempt to eliminate the trailer sway.

Weight-Carrying Hitch

A weight-carrying hitch supports the trailer tongue weight, just as if it were luggage located at a hitch ball or some other connecting point of the vehicle. These kinds of hitches are the most popular on the market today and they are commonly used to tow small and medium sized trailers.

Weight-Distributing Hitch

A weight-distributing system works by applying leverage through spring (load) bars. They are typically used for heavier loads to distribute trailer tongue weight to the tow vehicle's front axle and the trailer axle(s). When used in accordance with the manufacturer's directions, it provides for a more level ride, offering more consistent steering and brake control thereby enhancing towing safety. The addition of a friction/hydraulic sway control also dampens sway caused by traffic and crosswinds and contributes positively to tow vehicle and trailer stability. Trailer sway control and a weight distributing (load equalizing) hitch are recom- mended for heavier Tongue Weights (TW) and may be required depending on vehicle and trailer configuration/ loading to comply with Gross Axle Weight Rating (GAWR) requirements.

Trailer Hitch Classification

The following chart provides the industry standard for the maximum trailer weight a given trailer hitch class can tow and should be used to assist you in selecting the correct trailer hitch for your intended towing condition.

Trailer Towing Weights (Maximum Trailer Weight Ratings) — Non SRT

The following chart provides the maximum trailer weight ratings towable for your given drivetrain:

NOTE:

The trailer tongue weight must be considered as part of the combined weight of occupants and cargo, and should never exceed the weight referenced on the Tire and Loading Information placard. Refer to “Tires” in “Servicing And Maintenance” for further information. The addition of passengers and cargo may require reducing trailer tongue load and Gross Trailer Weight (GTW). Redistributing cargo (to the trailer) may be necessary to avoid exceeding Rear Gross Axle Weight Rating (GAWR) of 3,700 lbs (1,678 kg).

NOTE:

• The trailer tongue weight must be considered as part of the combined weight of occupants and cargo, and should never exceed the weight referenced on the Tire and Loading Information placard. Refer to “Tires” in “Servicing And Maintenance” for further information.
• The manufacturer does not recommend using the run flat feature while driving a vehicle loaded at full capacity or towing a trailer.

Trailer Hitch Receiver Cover Removal (Summit Models) — If Equipped

Your vehicle may be equipped with a trailer hitch receiver cover, this must be removed to access the trailer hitch receiver (if equipped). This hitch receiver cover is located at the bottom center of the rear fascia.

1. Turn the two locking retainers located at the bottom of the hitch receiver cover a quarter turn counterclockwise.

NOTE:

Use a suitable tool such as a coin in the slot of the locking retainer if needed for added leverage.

1. Hitch Receiver Cover
2. Locking Retainers
2. Pull the bottom of the cover outward (towards you), pull downwards to disengage the tabs located at the top of the hitch receiver cover.

To reinstall the hitch receiver cover after towing repeat the procedure in reverse order.

NOTE:

Be sure to engage all tabs of the hitch receiver cover in the bumper fascia prior to installation.

Trailer Hitch Receiver Cover Removal (SRT Models) — If Equipped

Your vehicle may be equipped with a trailer hitch receiver cover. This must be removed to access the trailer hitch receiver (if equipped). This hitch receiver cover is located at the bottom center of the rear fascia.

• Turn the two locking retainers located at the bottom of the hitch receiver cover a quarter turn counterclockwise.

NOTE:

Use a suitable tool such as a coin in the slot of the locking retainer if needed for added leverage.

Hitch Receiver Cover

1. Hitch Receiver Cover
2. Locking Retainer

• Pull the bottom of the cover outward (towards you).

5

Hitch Receiver Cover

• Lower back down to disengage the tabs located at the top of the hitch receiver cover and then pull outwards to remove.

Hitch Receiver Cover Removal

To reinstall the hitch receiver cover after towing repeat the procedure in reverse order.

NOTE:

Be sure to engage all tabs of the hitch receiver cover in the bumper fascia prior to installation.

Never exceed the maximum tongue weight stamped on your bumper or trailer hitch.

Weight Distribution

NOTE:

Remember that everything put into or on the trailer adds to the load on your vehicle. Also, additional factory-installed options or dealer-installed options must be considered as part of the total load on your vehicle. Refer to the “Tire And Loading Information” in this chapter for the maximum combined weight of occupants and cargo placard for your vehicle.

Consider the following items when computing the weight on the rear axle of the vehicle:

• The tongue weight of the trailer.
• The weight of any other type of cargo or equipment put in or on your vehicle.
• The weight of the driver and all passengers.

Towing Requirements

To promote proper break-in of your new vehicle drivetrain components, the following guidelines are recommended.

Perform the maintenance listed in the “Scheduled Servicing”. Refer to “Scheduled Servicing” in “Servicing And Maintenance” for the proper maintenance intervals. When towing a trailer, never exceed the GAWR or GCWR ratings.

Towing Requirements — Tires

• Do not attempt to tow a trailer while using a compact spare tire.
• Do not drive more than 50 mph (80 km/h) when towing while using a full size spare tire.
• Proper tire inflation pressures are essential to the safe and satisfactory operation of your vehicle. Refer to “Tires” in “Servicing And Maintenance” for proper tire inflation procedures.
• Check the trailer tires for proper tire inflation pressures before trailer usage.
• Check for signs of tire wear or visible tire damage before towing a trailer. Refer to “Tires” in “Servicing And Main- tenance” for the proper inspection procedure.
• When replacing tires, refer to “Tires” in “Servicing And Maintenance” for the proper tire replacement procedures. Replacing tires with a higher load carrying capacity will not increase the vehicle's GVWR and GAWR limits.

Towing Requirements — Trailer Brakes

• Do not interconnect the hydraulic brake system or vacuum system of your vehicle with that of the trailer. This could cause inadequate braking and possible personal injury.
• An electronically actuated trailer brake controller is required when towing a trailer with electronically actuated brakes. When towing a trailer equipped with a hydraulic surge actuated brake system, an electronic brake controller is not required.
• Trailer brakes are recommended for trailers over 1,000 lbs (453 kg) and required for trailers in excess of 2,000 lbs (907 kg).

Towing Requirements — Trailer Lights And Wiring

Whenever you pull a trailer, regardless of the trailer size, stoplights and turn signals on the trailer are required for motoring safety.

The Trailer Tow Package may include a four- and seven-pin wiring harness. Use a factory approved trailer harness and connector.

NOTE:

Do not cut or splice wiring into the vehicle’s wiring harness.

The electrical connections are all complete to the vehicle but you must mate the harness to a trailer connector. Refer to the following illustrations.

Seven-Pin Connector

1. Battery
2. Backup Lamps
3. Right Stop/Turn
4. Electric Brakes
5. Ground
6. Left Stop/Turn
7. Running Lamps

NOTE:

• Disconnect trailer wiring connector from the vehicle before launching a boat (or any other device plugged into vehicle’s electrical connect) into water.
• Be sure to reconnect once clear from water area.



Four-Pin Connector

1. Female Pins
2. Male Pin
3. Ground
4. Park
5. Left Stop/Turn
6. Right Stop/Turn

Before setting out on a trip, practice turning, stopping, and backing up the trailer in an area located away from heavy traffic.

Select the DRIVE (D) range when towing. The transmission controls include a drive strategy to avoid frequent shifting when towing. However, if frequent shifting does occur while in DRIVE, you can use the AutoStick shift control to manu- ally select a lower gear.

Select the DRIVE (D) range when towing. The transmission controls include a drive strategy to avoid frequent shifting when towing. However, if frequent shifting does occur while in DRIVE, select TOW mode, or use the AutoStick shift control to manually select a lower gear.

NOTE:

Using a lower gear (using the AutoStick shift control) while operating the vehicle under heavy loading conditions, will improve performance and extend transmission life by reducing excessive shifting and heat buildup. This action will also provide better engine braking.

NOTE:

Using TOW mode, or selecting a lower gear (using the Auto- Stick shift control) while operating the vehicle under heavy loading conditions, will improve performance and extend transmission life by reducing excessive shifting and heat buildup. This action will also provide better engine braking.

TOW Mode

To reduce the potential for automatic transmission over- heating, select TOW mode when driving in hilly areas, or select a lower gear (using the AutoStick shift paddles) on more severe grades.

AutoStick

• When using the AutoStick shift control, select the highest gear that allows for adequate performance and avoids frequent downshifts. For example, choose “5” if the desired speed can be maintained. Choose “4” or “3” if needed to maintain the desired speed.
• To prevent excess heat generation, avoid continuous driving at high RPM. Reduce vehicle speed as necessary to avoid extended driving at high RPM. Return to a higher gear or vehicle speed when grade and road conditions allow.

Speed Control — If Equipped

• Do not use on hilly terrain or with heavy loads.
• When using the Speed Control, if you experience speed drops greater than 10 mph (16 km/h), disengage until you can get back to cruising speed.
• Use Speed Control in flat terrain and with light loads to maximize fuel efficiency.

To reduce potential for engine and transmission over- heating, take the following actions:

City Driving

In city traffic — while stopped, place the transmission in NEUTRAL, but do not increase engine idle speed.

Highway Driving

• Reduce speed.
• Temporarily turn off air conditioning.
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