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GMC · 1st gen (Lambda) · 2007–2016

GMC Acadia (2007–2016): Problems, Reliability & Repair Costs

The first-gen Acadia is a roomy, comfortable three-row that's badly let down by two expensive, well-documented failures: the 3.6L V6 timing chain stretches, and the 6T75 automatic eats its 3-5-Reverse wave plate. Both were widespread enough that GM issued special-coverage warranty extensions. A clean later-year car with documented repairs can be a cheap big SUV; the wrong early one is a $4,000-repair waiting to happen.

4/10 CarCaseFile
reliability score

Engines

  • LY7 — 3.6L gasoline, 275 hp
  • LLT — 3.6L gasoline, 288 hp

Transmissions

  • 6T75 — automatic, 6-speed

Drivetrain

FWD / AWD

Body

suv

Should you buy a 2007–2016 GMC Acadia?

Buy only with eyes open, and only the right car. The first-gen Acadia gives you a lot of three-row SUV for the money, but it carries two genuinely expensive failure modes — the 3.6L timing chain and the 6T75 transmission wave plate — that can each cost $3,000–$5,000. Both were covered by GM special-coverage extensions that have now expired, so the risk is fully on the buyer today. Favor 2013–2016 cars (revised parts, fewer reports), demand service records showing the timing chain and/or transmission were addressed, and budget for a power-steering pump and water pump as near-term wear items. A documented, well-kept later car can be a smart cheap hauler; a cheap early one with no records is a gamble.

Best years

2013, 2014, 2015, 2016

Years to avoid

2007–2009 (timing chain + wave plate failures cluster here), 2010–2012 (still elevated transmission and steering risk)

Pre-purchase inspection checklist

  • ☐Cold-start the engine and listen for a rattle in the first few seconds — that's the classic stretched-timing-chain tell. Then scan for codes P0008/P0009/P0016–P0019.
  • ☐Drive it through all gears. Feel for a flare or RPM spike going into 3rd or 5th, and confirm reverse engages firmly and immediately — slipping reverse is the wave-plate death rattle.
  • ☐Ask for records proving the timing chain and/or 6T75 transmission were already repaired or replaced; a car with documented work is safer than an untouched one.
  • ☐Check the power steering: turn lock-to-lock at idle, listen for a chirp/whine, and look for fluid weeping from the pump — a known leak point.
  • ☐Look under the front of the engine for coolant residue at the water pump; pull the dipstick and cap to check for coolant/oil mixing.
  • ☐Run the A/C on a hot day and watch that the compressor clutch stays engaged over bumps — intermittent cutout points to the underhood harness/fuse-block issue.
  • ☐On AWD cars, listen for driveline whine and check for service history on the power takeoff unit and rear differential.
  • ☐Pull a VIN recall/special-coverage report (GM owner site or a dealer) to see what was performed and what's now expired.

Common GMC Acadia problems & repair costs

3.6L timing chain stretch

$2,700–$3,700
engine severe 2007–2013 (worst 2007–2009) ~80k–130k mi

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

6T75 transmission 3-5-Reverse wave plate failure

$3,500–$5,500
transmission severe 2007–2012 (worst 2007–2009) ~Often before 90k mi

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

Power steering pump leak / heavy steering

$600–$1,300
steering moderate 2007–2011 (reported through 2016)

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)

Water pump shaft-seal coolant leak

$700–$1,100
cooling moderate 2009–2013 ~70k–120k mi

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

A/C compressor / clutch / harness failure

$700–$1,500
hvac moderate 2007–2016

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

The Acadia is cheap to buy and roomy to live with, but it is not a cheap car to keep once the big-ticket items come due. The two that define ownership cost are the timing chain and the 6T75 transmission — either one can equal or exceed the value of an older car. Even on a healthy car, plan for a power-steering pump, a water pump, and eventual A/C work as normal wear on this generation. Routine items (brakes, fluids, plugs) are ordinary GM costs. The smart move is to buy one where the expensive failures are already documented-fixed and then maintain the engine oil religiously to protect the chain.

DIY repairs & parts

Replace the cabin & engine air filters

easy 20–30 min saves ~$60–$120

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, unclip the airbox lid, lift out the old panel filter, and drop in the new one.
  4. Re-clip the airbox, close the glovebox, and confirm everything seats flush.

Parts

Replace the serpentine belt

moderate 1 hr saves ~$80–$160

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.

Parts

Replace the battery

easy 30 min saves ~$40–$80

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.

Parts

Some parts links are affiliate links — we may earn a commission at no cost to you. We only list parts that fit this generation.

The short version

The first-generation GMC Acadia (2007–2016) is a lot of three-row SUV for the money — and the price reflects two failures that hang over the whole generation. The 3.6L V6 timing chain stretches, and the 6T75 automatic destroys its 3-5-Reverse wave plate. Either one can run $3,000–$5,000.

Both were common enough that GM extended warranty coverage on them (10 years / 120,000 miles on each), plus a separate steering-pump extension. All of those have now expired, so today the risk lands entirely on whoever owns the car.

What to check before you buy

Two tests decide whether an Acadia is a deal or a money pit.

First, cold-start the engine and listen to the first few seconds. A rattle that fades as oil pressure builds is the stretched-chain warning. Back it up with a code scan — P0008/P0009 and the P0016–P0019 correlation codes are the giveaways.

Second, drive every gear. A flare or RPM flare-up going into 3rd or 5th, late engagement, or any hesitation in reverse means the wave plate is on its way out. Reverse that slips or drops out is the classic end-stage symptom, and once it lets go, metal contaminates the transmission fast.

A car with paperwork showing the timing chain and/or transmission were already replaced is safer than a low-mileage one that’s never been touched — the original parts are the problem, so a documented fix removes the biggest unknown.

The rest of the list

Beyond the two headliners, plan for ordinary-but-not-cheap wear: a power-steering pump that leaks or goes heavy, a water pump that weeps coolant (it lives under the intake, so labor isn’t trivial), and A/C that can quit from either a tired compressor or a flaky underhood harness connector. None of these are dealbreakers on their own — they’re predictable on this generation, so price them in.

How this file is built: failure modes and cost ranges are compiled from NHTSA complaint and TSB data, GM’s own special-coverage actions, independent repair sources, and owner forums, then sanity-checked against shop-floor experience. Cost figures are 2024–2026 independent-shop estimates and vary by region. Spot something off? Tell us.

Viral car myths, checked

Frequently asked questions

Which GMC Acadia years should I avoid?

The 2007–2009 cars are the riskiest — they cluster both the timing-chain stretch and the 6T75 wave-plate transmission failure. 2010–2012 are better but still carry elevated transmission and power-steering risk. The 2013–2016 cars are the safer used buy, especially with records showing the big-ticket repairs were already done.

Is the GMC Acadia transmission failure covered by GM?

It was. GM issued Special Coverage 14404B extending the wave-plate transmission warranty to 10 years / 120,000 miles on affected cars, and a similar 10-year/120,000-mile extension on the timing chain. Both have now expired, so on a car today the repair is on the buyer — which is exactly why you verify the work was already done before purchase.

How much does it cost to fix the Acadia timing chain or transmission?

A full timing-chain kit job runs roughly $2,700–$3,700 at an independent shop. A failed 6T75 that's contaminated usually needs a reman unit, with real-world installed invoices around $3,500–$5,500. Either repair can rival the value of an older Acadia, so they're the make-or-break checks.

Is the first-gen GMC Acadia reliable?

Honestly, it's below average. It's spacious and comfortable, but the timing chain, transmission, and power-steering issues on this generation are common and expensive. A well-documented later car that's been maintained can serve you well; an untouched early one with no records is a real gamble.