The 2006 HHR is a retro-styled compact on the Cobalt platform with decent bones but plagued by ignition switch failures, fuel pump issues, and timing chain problems on the 2.2L/2.4L engines that can lead to catastrophic damage if ignored.
Ignition Switch Failure (Recalled)
Common · high severitySymptoms: Key won't turn or gets stuck in ignition, Engine stalls while driving, Loss of power steering and brakes during stall, Airbags may not deploy in a crash
Fix: GM recall 14V-153 covers replacement of ignition lock cylinder and keys. If not done, requires ignition switch and/or lock cylinder replacement, 1.5-2 hours labor. This is a safety-critical fix.
Estimated cost: $0 if recall applied, $250-400 if not covered
Timing Chain Stretch and Guide Failure (2.2L/2.4L)
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Rattling noise on cold start that quiets after warmup, Check engine light with cam/crank correlation codes (P0017, P0008), Rough idle or poor performance, Catastrophic engine failure if chain jumps timing
Fix: Timing chain, guides, tensioner, and VVT actuators must be replaced. Requires front cover removal, oil pump inspection. 8-12 hours labor. The 2.2L Ecotec is notorious for this; many engines are damaged beyond repair if driven with stretched chain.
Estimated cost: $1,200-2,200
Fuel Pump Failure
Common · high severityTypical onset: 60,000-120,000 mi
Symptoms: Intermittent no-start or extended cranking, Engine dies at operating temperature, Loss of power under acceleration, Whining noise from rear of vehicle
Fix: Fuel pump module replacement requires dropping the fuel tank. 2-3 hours labor. Use OEM or quality aftermarket (AC Delco) — cheap pumps fail quickly.
Estimated cost: $500-800
Transmission Oil Cooler Line Corrosion (4T45-E Auto)
Common · medium severityTypical onset: 70,000-130,000 mi
Symptoms: Transmission fluid leaking near radiator, Pink or red fluid pooling under vehicle, Transmission overheating or slipping if fluid level drops, Burnt transmission fluid smell
Fix: Steel cooler lines rust through at fittings and along frame rails (salt-belt cars especially). Replace both lines and inspect radiator cooler for contamination. 2-3 hours labor, may require transmission fluid flush if contaminated.
Estimated cost: $400-700
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Vibration at idle that worsens with RPM, Squealing or chirping from serpentine belt, Visible wobble or rubber separation on crankshaft pulley, Check engine light with misfire codes
Fix: Rubber dampener separates from pulley hub, causing accessory belt misalignment and potential timing cover damage. Replacement requires special puller and installer tools. 2-3 hours labor.
Estimated cost: $350-600
Power Window Regulator Failure
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Window drops into door or won't stay up, Grinding or clicking noise when operating window, Window moves slowly or unevenly, Complete failure to move
Fix: Plastic regulator gears strip or cables fray. Front doors fail more often than rears. Requires door panel removal and regulator replacement. 1.5-2 hours per door.
Estimated cost: $250-400 per door
Evaporative Emissions Purge Valve and Vent Solenoid Failure
Occasional · low severityTypical onset: 70,000-110,000 mi
Symptoms: Check engine light with P0441, P0455, P0446 codes, Rough idle or stalling when fuel cap is opened, Fuel smell around vehicle, Failed emissions test
Fix: Purge valve sticks open/closed or vent solenoid fails. Both are common on Ecotec engines. Purge valve is near intake manifold (30 min), vent solenoid is near fuel tank (1 hour labor).
Estimated cost: $150-350 depending on which component
Buy only if timing chain and ignition recall have been addressed, and budget $1,500 for deferred maintenance — decent utilitarian transport but requires proactive care to avoid expensive surprises.
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.