2008 GMC Acadia Problems: 8 Known Issues

On the 2007-2023 GMC Acadia, gM customer-satisfaction bulletin 13079 covers certain 2009-2013 GMC Acadia vehicles with 3.6L High Feature V6 engines (RPO LY7 or LLT) that may experience leakage from the water-pump shaft seal, often after operation with low coolant.

On the 2007-2016 GMC Acadia, gM bulletin 12-06-01-009D covers 2007-2012 GMC Acadia vehicles with 3.6L High Feature V6 engines (RPO LY7 or LLT) and timing-chain correlation DTCs P0008, P0009, P0016, P0017, P0018 or P0019.

On the 2007-2008 GMC Acadia, first-generation Acadias from 2007 and 2008 that were optioned with the heated wiper washer fluid system are covered by NHTSA recall 08V441000. The heater unit's printed circuit board can short circuit and overheat the control-circuit ground wire. What an owner may experience, per GM, is other electrical features misbehaving, an odor, or smoke — the reason the agency classes this as a fire risk. The 857,735 vehicles listed for this recall are the total for the whole GM campaign, which included several brands.

On the 2007-2009 GMC Acadia, gMC Acadias from 2007 through 2009 that were equipped with the heated washer fluid system (HWFS) are covered by NHTSA recall 10V240000. What makes this one notable is that it is a second bite at the same defect: GM recalled these vehicles in 2008 to add a fuse to the heated washer module's control circuit harness, intended to contain a printed circuit board electrical short, and thermal incidents were still reported on modules that had received the improvement. NHTSA's consequence language is unambiguous — the heated washer module may ignite and a fire may occur.

On the 2007-2016 GMC Acadia, gM special-coverage bulletin 10248773 covers specified 2007-2011 GMC Acadia vehicles with power-steering pump wear that can intermittently reduce hydraulic pressure and steering assist. Manual steering remains available but requires greater effort, especially at low speeds.

On the 2007-2018 GMC Acadia, the Lambda-platform hub bearing assemblies wear early — owners report failures well under 60,000 miles and, on the rear, repeat failures on the same vehicle. Two distinct symptoms come from one part: mechanical noise (a speed-dependent hum or growl that changes when the vehicle is loaded in a turn) and an ABS fault, because the encoder/tone ring on GM Lambda hubs is magnetically printed onto the bearing's inner race surface. When that magnetic layer degrades or sloughs off, the ABS module gets an implausible wheel speed signal and posts a wheel speed sensor code even though the sensor itself is fine — which is why replacing the sensor does not fix it.

On the 2007-2012 GMC Acadia, the 35R clutch wave plate inside the 6T70/6T75 six-speed transaxle cracks and fractures, allowing the 35R clutch piston to overstroke and leak apply pressure. The result is a hard flare or slip in 3rd and 5th gear and eventually a complete loss of reverse. Failures typically begin after about 25,000 miles and are extremely common on the early Lambda Acadia; GM eventually extended coverage on the wave plate to 10 years/120,000 miles. Debris from the broken plate circulates through the transmission, so a simple plate swap is often not enough on high-mileage units.

On the 2007-2021 GMC Acadia, the dual-zone HVAC case uses several small plastic-geared blend/mode door actuators. The gear teeth strip or the door binds, so the actuator hunts for its calibration position and produces a repetitive clicking or ticking from behind the dash or glovebox. The classic complaint is full heat on the driver's side and ice-cold air on the passenger's side (or the reverse), often with the click audible whenever the temperature setting is changed or the ignition is cycled. It is one of the most common non-powertrain complaints on the Acadia across both generations because every part of the actuator drivetrain is plastic.