07-00-89-021P Service Bulletin/Repair Instructions

File in Section:
Service Bulletin
Bulletin No.:

Date:
00 - General Information

07-00-89-021P

March, 2013
INFORMATION

Subject:
Supplemental Information on Trailer Towing and Recreational Vehicle Towing (Dinghy

Towing)
Models:
2008-2013 Buick Enclave

2009-2013 Chevrolet Traverse

2007-2013 GMC Acadia

2007-2010 Saturn OUTLOOK
This bulletin is being revised to add an Important statement to the Towing a Trailer section.

Please discard Corporate Bulletin Number 07-00-89-021O (Section 00 – General Information).
The purpose of this bulletin is to inform dealers of

special procedures necessary when towing a trailer or

when towing the vehicle behind a recreational vehicle.
Towing a Trailer

Trailer Weight Information

The following chart shows how much the trailer can

weigh, based on the vehicle powertrain combination

and whether the vehicle is equipped with Trailer

Provision (RPO V92). Retailers should refer customers

to the appropriate Owner Manual for important trailering

tips, vehicle maintenance, and safety rules before

towing a trailer.

Vehicle
Maximum Trailer Weight for Vehicles

Built Prior to 12/04/08
Maximum Trailer Weight for Vehicles

Built After to 12/04/08
2007-2013 GMC Acadia, 2007-2010

Saturn OUTLOOK Equipped with Trailer

Provisions (RPO V92)
4,500 lb. (2,041 kg)
5,200 lb. (2,359 kg)
2007-2013 GMC Acadia, 2007-2010

Saturn OUTLOOK Equipped without

Trailer Provisions (RPO V92)
2,000 lb. (907 kg)
2,000 lb. (907 kg)
2008-2013 Buick Enclave Equipped with

Trailer Provisions (RPO V92)
4,500 lb. (2,041 kg)
4,500 lb. (2,041 kg)
2008-2013 Buick Enclave Equipped

without Trailer Provisions (RPO V92)
2,000 lb. (907 kg)
2,000 lb. (907 kg)
2009-2013 Chevrolet Traverse Equipped

with Trailer Provisions (RPO V92)
5,200 lb. (2,359 kg)
5,200 lb. (2,359 kg)
2009-2013 Chevrolet Traverse Equipped

without Trailer Provisions (RPO V92)
2,000 lb. (907 kg)
2,000 lb. (907 kg)
Copyright 2013 General Motors LLC. All Rights Reserved.
Page 2
March, 2013
Important: The following modifications are intended to

address the ability to update a vehicle to allow the

electrical function for trailer lighting when trailer towing

is desired only. Modification of a non-V92 vehicle to

bring it up to the towing capacity of a V92 equipped

vehicle is not practical or recommended. The V92

package when ordered as part of the original build of

the vehicle includes additional cooling capability,

engine and transmission calibrations to include a Tow/

Haul mode, which are not available for retrofit. The

towing capability will remain at the non-V92 limits, even

after the recommended electrical updates included in

this bulletin to allow trailer lighting to function.

Towing a Trailer with a Vehicle without Trailer

Provisions (RPO V92) (2007 Model Year Only)

These vehicles must be modified by installing a new

underhood bussed electrical center (UBEC) to provide

full functionality for 4 circuits: ground, tail lamps, RH

and LH stop/turn lamps. Perform this modification only

if the customers will be using the vehicle to tow.

The replacement of the UBEC remains the best

solution to upgrade the vehicles wiring for towing. The

electrical circuitry for the tail/stop lamps is controlled by

the BCM and splicing into the body harness is not

recommended.

The backup lamp circuit will also need to be modified

using the following procedure:

1. Disconnect the X7 connector from the Body

Control Module (BCM).

2. Remove the terminal for pin 3 from the BCM X7

connector. The wire to this terminal is dark blue

and is the 38 circuit.
Bulletin No.: 07-00-89-021P
3. Re-connect the X7 connector to the BCM.

4. Cut the terminal off the end of this wire and strip

the end of the wire.

5. Splice this wire into the 24 circuit wire that goes

into BCM connector X6, pin 2. The 24 circuit is light

green.

Towing a Trailer with a Vehicle without Trailer

Provisions (RPO V92) (2008-2012 Model Year Built

Prior to May 01, 2012)

These vehicles must be modified by installing a new

underhood bussed electrical center (UBEC) to provide

full functionality for 4 circuits: ground, tail lamps, RH

and LH stop/turn lamps. Perform this modification only

if the customers will be using the vehicle to tow.

The replacement of the UBEC remains the best

solution to upgrade the vehicles wiring for towing. The

electrical circuitry for the tail/stop lamps is controlled by

the BCM and splicing into the body harness is not

recommended.

Towing a Trailer with a Vehicle without Trailer

Provisions (RPO V92) (2012–2013 Model Year Built

After April 30, 2012)

These vehicles must be modified by installing the

necessary relays and fuses into the underhood bussed

electrical center (UBEC) to provide full functionality for

4 circuits: ground, tail lamps, RH and LH stop/turn

lamps. Refer to the illustration below for relay and fuse

locations. Perform this modification only if the

customers will be using the vehicle to tow.
Bulletin No.: 07-00-89-021P
March, 2013
Page 3
2704723
Recreational Vehicle Towing (Dinghy

Towing)

Recreational Vehicle Towing Information

Important: Vehicles that are “dinghy towed” must be

started at the beginning of each day and at each fuel

stop for a minimum of five minutes.

Recreational vehicle towing means towing the vehicle

behind another vehicle – such as behind a motorhome.

The two most common types of recreational vehicle

towing are known as "dinghy towing" (towing the

vehicle with all four wheels on the ground) and "dolly
towing" (towing the vehicle with two wheels on the

ground and two wheels up on a device known as a

"dolly"). With the proper preparation and equipment,

many vehicles can be towed in these ways. Refer to the

appropriate model/model year Owner Manual for

towing preparation guidelines and dolly and dinghy

towing procedures. The Towing Chart below

summarizes powertrain combination compatibility with

dolly and dinghy towing methods.
Recreational Vehicle Towing Chart

Powertrain Combination and Towing

Method
Rear Wheels on a Tow

Dolly
Front Wheels on a Tow

Dolly
All Four Wheels on the

Ground (Dinghy)
3.6L V6 Engine with Front-Wheel Drive and

6T75 Six-Speed Automatic Transaxle (MY9)
No
Yes
Yes*
3.6L V6 Engine with All-Wheel Drive and

6T75 Six-Speed Automatic Transaxle (MH6)
No**
No**
Yes*
*Caution: These vehicle can be dinghy towed from the

front for unlimited miles at 65 mph (105 km/h). To avoid

vehicle damage, never exceed 65 mph (105 km/h) while

towing these vehicles. The repairs would not be

covered by the warranty.

**Caution: Dolly towing an all-wheel drive vehicle may

result in premature failure of the rear drive module.
Dinghy Towing Procedure (2007-2008 Model Year)

Caution: If you tow your vehicle without performing

each of the steps listed under "Dinghy Towing," you

could damage the automatic transmission. Be sure to

follow all steps of the dinghy towing procedure prior to

and after towing your vehicle.
Page 4
March, 2013
Caution: Don't tow a vehicle with the front drive

wheels on the ground if one of the front tires is a

compact spare tire. Towing with two different tire sizes

on the front of the vehicle can cause severe damage to

the transmission.

Important: All-wheel drive vehicles may only be

dinghy towed from the front, with all four wheels on the

ground.

1. Position the vehicle to tow. Shift the transmission

to PARK (P) and turn the ignition to OFF.

2. Securely attach the vehicle being towed to the tow

vehicle.

3. Set the parking brake.

4. Turn the ignition to ACCESSORY.

5. Shift your transmission to NEUTRAL (N).
Bulletin No.: 07-00-89-021P
Important: All-wheel drive vehicles may only be

dinghy towed from the front, with all four wheels on the

ground.

1. Position the vehicle to tow. Shift the transmission

to PARK (P) and turn the ignition to OFF.

2. Securely attach the vehicle being towed to the tow

vehicle.

3. Set the parking brake.

4. Turn the ignition to ACCESSORY.

5. Shift your transmission to NEUTRAL (N).
2513344
6. To prevent your battery from draining while the

vehicle is being towed, remove the 50 amp BATT1

fuse (1) in the UBEC and store in a safe location.

7. Release the parking brake.

Once you have reached your destination, do the

following steps:

1. Set the parking brake.

2. Reinstall the BATT1 fuse.

3. Shift the transmission to PARK (P), turn the ignition

key to OFF and remove the key from the ignition.

4. Release the parking brake.
Important: The fuses must be removed in the order

specified.

6. Remove the 15 amp ECM fuse (1) in the UBEC

and store in a safe location.

7. To prevent your battery from draining while the

vehicle is being towed, remove the 50 amp BATT1

fuse (2) in the UBEC and store in a safe location.

8. Release the parking brake.

Once you have reached your destination, do the

following steps:

1. Set the parking brake.

2. Reinstall the BATT1 fuse.

3. Reinstall the ECM fuse.

4. Shift the transmission to PARK (P), turn the ignition

key to OFF and remove the key from the ignition.

5. Release the parking brake.
Dinghy Towing Procedure (2009-2012 Model Year

Built Prior to May 01, 2012)

Caution: If you tow your vehicle without performing

each of the steps listed under "Dinghy Towing," you

could damage the automatic transmission. Be sure to

follow all steps of the dinghy towing procedure prior to

and after towing your vehicle.

Caution: Don't tow a vehicle with the front drive

wheels on the ground if one of the front tires is a

compact spare tire. Towing with two different tire sizes

on the front of the vehicle can cause severe damage to

the transmission.
Dinghy Towing Procedure (2012–2013 Model Year

Built After April 30, 2012)

Caution: If you tow your vehicle without performing

each of the steps listed under "Dinghy Towing," you

could damage the automatic transmission. Be sure to

follow all steps of the dinghy towing procedure prior to

and after towing your vehicle.

Caution: Don't tow a vehicle with the front drive

wheels on the ground if one of the front tires is a

compact spare tire. Towing with two different tire sizes

on the front of the vehicle can cause severe damage to

the transmission.
2519677
Bulletin No.: 07-00-89-021P
March, 2013
Important: All-wheel drive vehicles may only be

dinghy towed from the front, with all four wheels on the

ground.

1. Position the vehicle to tow. Shift the transmission

to PARK (P) and turn the ignition to OFF.

2. Securely attach the vehicle being towed to the tow

vehicle.

3. Set the parking brake.

Note: If the ignition is turned to the RUN position

during this step, the MIL will illuminate with DTCs

U0100 and P0700 set in the transmission control

module (TCM). To clear the DTCs, the ignition must be

cycled three times.

4. Turn the ignition to ACCESSORY.

5. Shift your transmission to NEUTRAL (N).
Page 5
6. Remove the 20 amp ECM 1 fuse (1) in the UBEC

and store in a safe location.

7. To prevent your battery from draining while the

vehicle is being towed, remove the 50 amp BATT1

fuse (2) in the UBEC and store in a safe location.

8. Release the parking brake.

Once you have reached your destination, do the

following steps:

1. Set the parking brake.

2. Reinstall the BATT1 fuse.

3. Reinstall the ECM 1 fuse.

4. Shift the transmission to PARK (P), turn the ignition

key to OFF and remove the key from the ignition.

5. Release the parking brake.
Parts Information (2007-2012 Model

Year Built Prior to May 01, 2012)

For part numbers and usage of the UBEC, see Group

02.483 of the appropriate Parts Catalog. Saturn

retailers should refer to the appropriate model year

Parts & Illustration Catalog for the vehicle. Order the

UBEC with the same option content including

RPO V92.
Parts Information (2012–2013 Model

Year Built After April 30, 2012)

Part Number
Description
Qty
19116059
Relay
3
19116050
30 Amp Fuse
2
19116042
10 Amp Fuse
4
Warranty Information

2734174
Important: The fuses must be removed in the order

specified.
Please advise the customer that the installation and

cost of the new underhood bussed electrical center

(UBEC) will not be covered under the vehicle's

warranty.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these

technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper

service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a

job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your

vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the

information.
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