The 2010 HHR is a decent compact wagon built on GM's Delta platform, sharing architecture with the Cobalt. Main concerns center around ignition system failures, power steering gremlins, transmission cooling issues, and some unfortunate engine bottom-end problems on higher-mileage examples.
Ignition Lock Cylinder / Key Stuck Issues
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: Key won't turn or gets stuck in ignition, Shifter won't move out of park even with brake depressed, Vehicle won't start intermittently, Steering wheel locked with key inserted
Fix: GM issued a recall for ignition switch but lock cylinder wear is separate. Replacement involves removing steering column covers and drilling out shear bolts. 2.5-3.5 hours labor including programming if needed.
Estimated cost: $350-650
Electric Power Steering (EPS) Failure
Common · high severityTypical onset: 70,000-140,000 mi
Symptoms: Power steering cuts out completely while driving, Service StabiliTrak and power steering warning lights, Heavy steering effort at low speeds or suddenly at any speed, No warning before complete failure
Fix: Electric power steering motor assembly fails internally or loses communication. Entire column assembly usually requires replacement. 3-4 hours labor. This is a recall item (14V-342) but many units failed outside recall scope.
Estimated cost: $800-1,400
Transmission Oil Cooler Line Leaks
Common · medium severityTypical onset: 80,000-150,000 mi
Symptoms: Transmission fluid dripping from radiator area, Pink fluid spots on driveway, Low transmission fluid warnings, Overheating transmission if leak progresses
Fix: Quick-connect fittings at radiator or steel lines corrode and leak. Often requires replacing hard lines and cooler section. 2-3 hours labor including fluid refill and leak check.
Estimated cost: $400-750
Harmonic Balancer Failure (2.2L/2.4L)
Occasional · high severityTypical onset: 100,000-160,000 mi
Symptoms: Severe vibration at idle that worsens with RPM, Visible wobble of crankshaft pulley, Serpentine belt wearing unevenly or shredding, Squealing or grinding from front of engine
Fix: Rubber isolator separates allowing outer ring to wobble. Can damage crankshaft snout if driven too long. Requires special puller and installer tools. 3-4 hours labor on 2.2L/2.4L engines.
Estimated cost: $500-850
Timing Chain Stretch / Guide Wear (2.4L)
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: Rattling noise from front of engine on cold start, Check engine light with cam/crank correlation codes (P0016, P0017), Rough idle or hesitation, Metal shavings in oil
Fix: 2.4L Ecotec has known timing chain stretch issues. Requires front engine disassembly, new chain, guides, tensioner, and often VVT actuators. 8-12 hours labor depending on additional valve train damage discovered.
Estimated cost: $1,800-3,200
Fuel Pump Failure
Occasional · high severityTypical onset: 90,000-140,000 mi
Symptoms: No start condition with crank but no fire, Stalling when fuel tank below 1/4 full, Loss of power under acceleration, Whining noise from rear of vehicle
Fix: In-tank fuel pump assembly fails, particularly if vehicle regularly run low on fuel. Requires dropping fuel tank. 2.5-3 hours labor.
Estimated cost: $550-900
Solid platform if the electric power steering and ignition have already been addressed, but budget $1,500-2,000 for deferred maintenance and known failure points on any 100k+ mile example.
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.