The 2017 GMC Acadia (second-gen) represents GM's downsized crossover on the C1XX platform. While more refined than its predecessor, it suffers from catastrophic 3.6L V6 engine failures and persistent transmission cooling issues that can leave owners stranded with rebuild bills.
3.6L V6 Catastrophic Engine Failure (Piston Ring / Bearing Collapse)
Occasional · high severityTypical onset: 60,000-100,000 mi
Symptoms: Excessive oil consumption (1 quart per 1,000 miles or worse), Metallic knocking or rod knock at idle, Check engine light with misfire codes, Blue smoke from exhaust on startup, Sudden loss of power / total engine seizure
Fix: Complete engine rebuild or replacement required. Piston ring land failures and bearing wear are common failure modes on the LGX/LGZ V6. Expect 25-35 labor hours for short block replacement, more for full rebuild. Many owners opt for remanufactured long blocks due to internal scoring.
Estimated cost: $6,500-10,000
Transmission Oil Cooler Line Leaks / Cooler Failure
Common · high severityTypical onset: 50,000-90,000 mi
Symptoms: Transmission fluid leaking near radiator area, Transmission overheating warnings, Harsh shifting or slipping after highway driving, Pink fluid visible under vehicle, Transmission enters limp mode
Fix: The 9T45 9-speed transmission's external oil cooler lines corrode and leak, or the cooler itself fails internally. If coolant mixes with ATF, the transmission is often toast. Cooler line replacement is 2-3 hours; if internal cooler damage contaminated the trans, add 12-18 hours for transmission replacement.
Estimated cost: $400-800 (lines only), $4,500-6,500 (if trans damaged)
Transmission Mount Failure
Common · medium severityTypical onset: 40,000-80,000 mi
Symptoms: Clunking when shifting from Park to Drive/Reverse, Vibration at idle in gear, Visible sagging or torn rubber on mount, Excessive drivetrain movement when accelerating
Fix: The front transmission mount deteriorates prematurely on the C1XX platform, especially with the V6. Replacement requires supporting the powertrain and is about 2-2.5 hours. Use OEM or quality aftermarket; cheap mounts fail in 20,000 miles.
Estimated cost: $350-550
Rear Driveshaft Imbalance / Carrier Bearing Failure (AWD)
Occasional · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Vibration at highway speeds (60-70 mph), Clunking from underneath when accelerating, Whining or howling noise that changes with speed, Carrier bearing support bracket cracking
Fix: AWD models experience driveshaft imbalance and carrier bearing wear. GM issued a recall for some units (driveshaft separation risk). Requires driveshaft removal, balancing, and/or bearing replacement. About 2.5-3.5 hours including alignment of driveshaft phasing.
Estimated cost: $600-1,100
Fuel Pump Module Failure
Occasional · high severityTypical onset: 70,000-110,000 mi
Symptoms: No-start condition with fuel gauge reading, Engine cranks but won't fire, Intermittent stalling, especially when fuel level is low, Fuel pump not priming (no hum when key turned on), P0087 or P0230 codes
Fix: The in-tank fuel pump module fails, often without warning. GM issued a recall for some VINs. Requires dropping the fuel tank (3-4 hours labor). OEM pump module recommended as aftermarket units have high failure rates on this platform.
Estimated cost: $800-1,300
Front Brake Caliper Sticking / Uneven Pad Wear
Common · low severityTypical onset: 30,000-60,000 mi
Symptoms: Pulling to one side during braking, Premature pad wear on one side, Hot wheel smell after driving, Grinding noise from one front corner, Brake pedal pulsation
Fix: Front caliper slide pins seize or caliper pistons stick, causing uneven pad wear. GM had a recall addressing some caliper issues. Typically replace calipers and rotors in pairs. About 2 hours labor for both sides with rotor replacement.
Estimated cost: $500-900
Timing Chain Stretch / VVT Solenoid Failure (3.6L V6)
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Rattle on cold start (first 5 seconds), Check engine light with P0008, P0009, P0011, P0014 codes, Rough idle, Reduced power / poor acceleration, Whining from timing cover area
Fix: The 3.6L's timing chains can stretch, and VVT solenoids fail. If caught early, solenoid replacement is 2-3 hours. Timing chain job requires front cover removal and is 10-14 hours. Critical to address before chain jumps time and causes valve-to-piston contact.
Estimated cost: $350-600 (solenoids), $2,200-3,500 (chains)
Pass on high-mileage V6 examples due to engine grenade risk; low-mileage 2.5L models with documented maintenance are acceptable, but budget for transmission cooler preventive work.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.