Designed to be a more fuel efficient alternative to the traditional full size SUV, the GMC Acadia was introduced for the 2007 model year, and rode on the new FWD Lambda platform. All-wheel drive and a selection of V6 engines were available, making it a viable option for people that wanted fullsize capability and reasonable fuel economy. To that end, first gen versions of this upscale 3 row crossover were fitted with the 6 speed 6T75 transmission. Let’s look at some of the most common GMC Acadia transmission problems.
GMC Acadia Recalls
2014 Acadia – 14V092000 / 14048
According to the recall, the Acadia’s transmission shift lever may become detached from the transmission shift cable adjuster. If this happens, the shifter won’t work properly, and the gear indicator won’t be able to display the gear that’s actually selected.
Should the shifter become detached while the truck is being driven, the driver won’t be able to select Park, even though the shifter is in the correct position. This can lead to an unintended rollaway, resulting in serious property damage and/or injury.
This recall began on April 10, 2014, and GMC dealers were instructed to inspect and replace any affected transmission shift cable adjusters, free of charge. Owners can contact GMC at 1-800-462-8782, referring to recall # 14048. Or they can call the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236
2009 Acadia – 09V073000 / 09041
On some 2009 Acadia’s, the shift cable adjustment clip may come loose, causing the gear indicator to display the wrong gear.
If this problem occurs, the driver could remove the ignition key and exit the vehicle thinking the vehicle is in Park, even though it isn’t. This can lead to a rollaway, which can cause injury and/or property damage. A lesser consequence would be the inability to start the vehicle because the vehicle is not in Park.
This recall began on March 24, 2009, and GMC dealers were instructed to inspect and replace any affected transmission shift cable adjustment clips, free of charge. Owners can contact GMC at 1-800-462-8782, referring to recall # 09041. Or they can call the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236
Acadia Technical Service Bulletins (TSB)
2013 Acadia – TSB 13120A
The torque converter clutch solenoid can stick due to debris in the transmission. When the vehicle is at the end of a coast-down, as the vehicle is coming to a stop, a stuck solenoid will fail to release the torque converter clutch. This keeps the engine directly connected to the driven wheels. As the vehicle stops, the engine speed will be pulled down below normal idle speed and the engine may stall. The vehicle can be immediately restarted and driven
The transmission control module will have to be reprogrammed in order to correct the problem.
2007 Acadia – TSB 09-07-30-012B
Owners may experience a Check Engine/SES light along with no reverse and/or a slip / flare or harsh shifts in 3rd and/or 5th gear. This condition may be caused by a broken 3-5-R clutch wave plate, allowing the apply piston to over- stroke, causing the piston to leak and causing loss of gear application. This normally will not occur before approximately 32,000 km (20,000 mi). Debris generated by the condition can affect the operation of the speed sensors and other clutches.
A new 35R clutch wave plate will need to be installed.
2009 Acadia – TSB PIP4668
Symptoms associated with this service bulletin include:
- Hesitation when accelerating during a right hand turn around 15 mph.
2. Hesitation/delay/harsh shift around 40 mph during 5-3-2 shift.
3. Low speed hesitation during a 2-3 shift on light acceleration after launch.
4. Cruise control busyness around 50 mph and/or poor shift feel.
5 .Delayed up-shift after a forced throttle downshift after returning to normal throttle.
6. Nonlinear deceleration feel and/or tachometer swing on 5-4 coast-down shift as a result of entering and exiting Decel Fuel Cut Off (DFCO)
The transmission control module will have to be reprogrammed in order to correct these problems.
How to Diagnose & Fix
- Check the OBD Codes
- Check the fluid level
- Test transmission pressure
- Drop the transmission pan
- Repair, replace or rebuild
What to Read Next
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