GMC Acadia 2007–2016Common problems, reliability & repair costs

Symptoms: Rattle from the engine on cold start or under acceleration, Check Engine light with camshaft/crankshaft correlation codes (P0008, P0009, P0016–P0019), rough running, and in bad cases reduced power. Often traced to oil neglect from the original long oil-change intervals.

Fix: Full timing chain kit (chains, guides, tensioners) replacement, labor-intensive. GM issued TSBs and Special Coverage (10 years / 120,000 miles) on early cars, but that coverage has expired. Stay on top of oil changes to slow wear on a sound chain.

Sources: Go-Parts: P0009 stretched timing chain, 2007–2014 Acadia, GMC Acadia Forum: stretched timing chain, 1A Auto: top 1st-gen Acadia problems

Symptoms: Flare or RPM spike shifting into 3rd or 5th, late or harsh engagement, then reverse begins slipping and eventually drops out entirely. Once the thin spring-steel wave plate cracks, debris contaminates the valve body and TEHCM fast, often within minutes of the first hard failure.

Fix: If caught very early, a valve-body/wave-plate repair may save it; once contaminated, the realistic fix is a reman or replacement 6T75. GM issued Special Coverage 14404B (10 years / 120,000 miles) which has now expired.

Sources: GMCProblems: busted wave plates and overheating in 6T70/6T75, GM Service Bulletin (NHTSA TSB PDF), TransmissionRepairCostGuide: GMC Acadia

Symptoms: Steering suddenly heavy or hard to turn, whine or chirp from the pump, and low/leaking power-steering fluid. Some cars lose assist temporarily after driving through a puddle (water on the belt). GM released redesigned wheel-well liners for that.

Fix: Power steering pump replacement (plus belt, and the revised liner where applicable). GM extended the warranty on 2007–2011 pumps to 10 years / 150,000 miles, but that coverage has expired.

Sources: Engine Patrol: common GMC Acadia problems, Haynes: GMC Acadia problems and recalls (2006–2017)

Symptoms: Coolant weeping or dripping from the water pump area, low-coolant warnings, and sometimes a noisy pump. The 3.6L's water pump is a common wear item on these.

Fix: Water pump (and gasket) replacement; the pump sits under the intake on the 3.6L, which drives the labor. Replace the thermostat while you're in there if it's high mileage.

Sources: RepairPal: GMC Acadia water pump replacement cost, CarProblemZoo: GMC Acadia water pump problems

Symptoms: A/C blows warm, compressor clutch won't stay engaged, or the compressor cycles randomly. Some cars run again only when the underhood fuse-block wiring is wiggled, then quit on the next bump, a connector/harness fault. Failed compressor bearings can shed debris through the system.

Fix: Repair or reseat the underhood harness/fuse-block connector where that's the cause; otherwise compressor replacement, often with the orifice/drier and a system flush if the compressor failed internally.

Sources: GMC Acadia Forum: A/C not working / compressor clutch, RepairPal: GMC Acadia A/C not working

Tools: Screwdriver / trim tool

1. Open the glovebox, release the side stops to let it drop fully, and pull the cabin-filter access cover behind it.
2. Slide out the old cabin filter, noting the airflow arrow, and insert the new one the same direction.
3. For the engine filter, loosen the duct clamp, disconnect the sensor connector, remove the cover screws and lift the cover (on 2010-2012, remove the engine cover first). Lift out the old panel filter and drop in the new one.
4. Refit the cover and its screws, reconnect the sensor, tighten the duct clamp, close the glovebox, and confirm everything seats flush.

Tools: Serpentine belt tool or breaker bar (to rotate the tensioner), Socket set

1. Note the belt routing (photograph the under-hood diagram or the existing belt path).
2. Rotate the automatic tensioner to release belt tension and slip the old belt off the pulleys.
3. Route the new belt to match the diagram, leaving the tensioner pulley for last.
4. Hold tension off, seat the belt on the tensioner pulley, and release slowly.
5. Start the engine and confirm the belt tracks straight with no squeal.

Tools: 10mm and 13mm sockets, Memory saver (optional)

1. Turn everything off and disconnect the negative terminal first, then the positive.
2. Remove the hold-down clamp at the base of the battery.
3. Lift out the old battery (it's heavy) and set the new one in the same orientation.
4. Reinstall the hold-down, connect positive first then negative, and snug both terminals.
5. Reset the clock and any radio presets; let the relearn settle on a short drive.