This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗2006 Chevrolet HHR engine problems
moderate 39 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
39
Recalls
0
Avg fix
$3,100
1fire
When does it fail?
Of the 39 engine complaints filed for the 2006 Chevrolet HHR, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 6 model years of Chevrolet HHR we track for engine problems, this one carries the most owner complaints on file — 39.
Owners have filed 39 engine complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large amounts of debris has flowed throughout the oiling system.
full bulletin at NHTSA ↗This Warranty Admin service bulletin provides guidelines for Dealers Not Required and for Dealers Required to Contact the PQC for engine or transmission assembly replacement and explains the PQC process, GWM Transaction submission, vehicle service record retention and proper handling of assembly returns for Canadian Dealers only.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2006 HHR engine failures cluster around two dangerous scenarios: unexpected shutdown while driving, and complete loss of cooling or exhaust containment.
Stalling and power loss strike with little warning. At highway speeds—70 mph, 65 mph, even 73 mph—the engine simply shuts down or throws a "engine power reduced" message before losing power entirely. Some owners hit a pothole or bump first; others experience it on smooth pavement. The dash lights cut out, instrumentation goes black. Steering and brakes stay functional because the battery is still live, but drivers are coasting blind in traffic. The engine restarts minutes later or after multiple tries, but many failures have recurred unpredictably—one owner had six separate incidents, another reported it happening nearly daily after onset. Dealers have installed diagnostic recorders, cleaned throttles, replaced coil packs, and swapped the ECM module itself—none has consistently fixed it. GM has not issued a recall.
Cooling and exhaust failures are equally severe. Radiators lose all coolant during normal driving with no felt impact—road debris pierces an unprotected underside—and engine temperature spikes above 250 degrees within miles. Flex pipes connecting to the catalytic converter crack or break completely, venting carbon monoxide fumes directly into the cabin through the ventilation system. One owner developed persistent headaches; another noted the oil cooler leaks so badly that GM discontinued the part after six months and offers no replacement except a full engine swap for nearly $6,000, which the company refuses to fund.
These failures span the service life: early problems appear under warranty, and stalls recur at 80,000–140,000 miles. Owners report seeing multiple complaints for this model across online forums, yet no systematic recall action has been taken.
Same Chevrolet HHR engine reports on nearby years: 2007 · 2008
Failure modes owners describe
Unexpected Engine Stall / Shutdown While Driving
Engine shuts off or stalls without warning at highway and city speeds, sometimes after hitting bumps or potholes. Vehicle loses all power including dash lights and instrumentation. Engine typically restarts after several attempts or after a waiting period. Occurs intermittently or repeatedly.
When: Varies widely: 5 miles to 140,000 miles; recurs at speeds 25-73 mph, often on highways or after road bumps
Symptoms owners cite: Complete engine shutdown while driving; Loss of dash lights and instrumentation; Engine restart difficult or requires multiple attempts; Check engine light illuminated before or after event; Vehicle coasts to safety when power lost; Steering and brakes remain functional (vehicle still has battery power)
Codes mentioned: P0601 (ECM internal failure), Misfire codes (reported in some cases), Check engine light without specific code provided in many narratives
Repairs/costs cited: ECM module replacement ($670 parts + $250 labor in one case); throttle cleaning attempted; coil pack replacement attempted (failed); dealer unable to replicate or diagnose problem in most cases; one vehicle fitted with Event Data Recorder but failure could not be duplicated or repaired
Recalls/TSBs owners mention: No recalls issued; GM refused responsibility in some cases; dealership service suggests no defect found; one dealer refused further warranty work after second visit
Engine Power Reduced / Limp Mode
Dashboard message 'Engine Power Reduced' or 'Engine Disabled' appears; vehicle loses power and limps at 10-20 mph or stalls completely. Occurs randomly or unpredictably, sometimes with no check engine light beforehand.
When: Occurs at 45-80 mph; frequency varies from a few times per week to intermittent
Symptoms owners cite: Dashboard warning 'Engine Power Reduced' or 'Engine Disabled'; Sudden loss of acceleration and power; Vehicle slows to 10-20 mph when limp mode activates; No brake lights illuminate immediately when deceleration begins; Check engine light may or may not illuminate; Condition does not occur consistently on cruise control
Codes mentioned: Check engine light (cause not pinpointed in narratives)
Repairs/costs cited: No repairs described as successful; owners report forums indicate multiple possible causes (throttle, sensors, etc.) but no single fix identified; throttle cleaning mentioned but effectiveness unknown
Radiator / Coolant System Damage from Road Debris
Radiator and/or condenser sustain damage from road debris while driving normally on highways. No visible impact felt or recalled. Coolant leaks completely or nearly completely, causing engine overheating. Vehicle becomes undrivable or dangerous. No protective plate under radiator to prevent projectile damage.
When: Occurs during normal highway driving; failures reported at 50,000+ miles
Symptoms owners cite: Coolant warning light illuminates on dashboard; Alarm sounds; Temperature gauge reads over 250-300 degrees; Coolant completely depleted with no visible cause; Engine overheats rapidly (within 5 miles of driving)
Repairs/costs cited: Radiator and condenser replacement required (both beyond repair); repair costs not specified but implied to be expensive; one owner drove with temperature over 300 degrees to reach dealership due to fire risk warning
Recalls/TSBs owners mention: Dealer and manufacturer deny defect; manufacturer refused to install protective plate; no recall issued
Exhaust Flex Pipe / Flange Cracking
Flex hose connecting engine to catalytic converter develops cracks or breaks. Allows exhaust fumes including carbon monoxide to leak into cabin through ventilation system or causes loud noise from exhaust system. Exhaust cone inside front flange of converter assembly may break off.
When: Occurs at 50,000+ miles; one case at 78,000 miles
Symptoms owners cite: Loud noise from exhaust system; Strong smell of exhaust in vehicle cabin through A/C vents; Carbon monoxide fumes entering cabin; Headaches reported from prolonged exposure; Visible cracks in flex pipe or bellows; Vibration damper cracking and leaking
Repairs/costs cited: Flex pipe and catalytic converter replacement (approximately $700 parts + labor); in some cases replacement was only option as assembly is one piece; one owner replaced unit themselves at 82,000 miles
Oil Cooler Leaking / Engine Oil Loss
Oil cooler mounted on top of engine develops leak. Part was discontinued after 6 months due to defective design. Bypass produced as replacement also failed. No viable repair available except full engine replacement. Oil loss causes engine damage risk.
When: Early in vehicle ownership; part discontinued shortly after production
Symptoms owners cite: Oil leak from cooler; Oil and anti-freeze mixture leaking; Environmental contamination from fluid leak; Engine oil depletion
Repairs/costs cited: Part discontinued; no repair available; full engine replacement required (cost $5,999 cited); replacement bypass also failed
Recalls/TSBs owners mention: GM refused responsibility for defective part; refused financial assistance for engine replacement
Cylinder Head / Valvetrain Failure
Engine head goes bad at low mileage causing misfire condition and requiring engine pull and repair. Later recurrence of sputtering and check engine light after repair.
When: Approximately 15,000 miles initially; recurrence at 19,300 miles
Symptoms owners cite: Check engine light on and off repeatedly; Misfire diagnostic code; Sputtering from engine; Poor running condition
Codes mentioned: Misfire code
Repairs/costs cited: Engine pulled and head repaired at approximately 15,000 miles; multiple sensor replacements attempted before root cause found; problem recurred 3 months after repair at 19,300 miles
Oil Pan Hole / Damage
Vehicle develops hole in oil pan during normal driving at moderate speed. Engine oil leaks out, causing deceleration and strong burning odor.
When: At approximately 50,000 miles
Symptoms owners cite: Vehicle decelerates independently; Strong burning odor; Hole discovered in engine oil pan
Repairs/costs cited: Vehicle towed; owner states manufacturer would not provide assistance; vehicle not repaired per narrative
Recalls/TSBs owners mention: Manufacturer would not provide assistance
Coil Pack Defect
Coil pack becomes defective, causing engine stall and check engine light at moderate speed. Replacement attempted but fails to resolve problem.
When: At 119,000 miles with continuing issues through 135,000 miles
Symptoms owners cite: Engine stall while driving 50 mph; Check engine warning lamp illuminates
Repairs/costs cited: Coil pack replaced but failure persisted; vehicle not fully repaired
Loose Engine Component Wires / Vibration Issues
Engine component wires become loose, causing power steering lockup and stiff brake pedal. Vehicle shakes vigorously at moderate speeds.
When: At 67,000 miles
Symptoms owners cite: Power steering locked up; Brake pedal became stiff; Vigorous vehicle shaking; Engine light illuminated
Repairs/costs cited: Technician identified loose wires needing re-adjustment; narrative states 'vehicle was not repaired'
Thermostat / Cooling System Bypass Issue
Heater inoperative and coolant system does not cool engine properly. Thermostat housing compartment appears to be bypassed or inaccessible. Engine overheats after only 5 miles of driving.
When: Beginning of year in reported complaint; appears to be design or assembly issue
Symptoms owners cite: Heater does not work; Coolant system fails to cool engine; Engine temperature rises after 5 miles of driving; Thermostat housing compartment cannot be located or is bypassed
Exhaust Spiral Tubing Cracking
Metal spiral tubing exhaust pipe from manifold to exhaust system cracks internally despite appearing in mint condition externally. Results in exhaust leak.
When: Before 50,000 miles (owner states less than 2 years)
Symptoms owners cite: Exhaust leak; Internal crack in spiral tubing
Repairs/costs cited: Muffler shop technician indicated defect in metal itself; repair cost not specified
Synthesized from 39 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Tl* the contact owns a 2006 Chevrolet hhr. The contact stated that the battery died without warning. The battery was replaced, but the vehicle could not be started. The engine shut down warning light was also illuminated. The contact spoke with the manufacturer in regards to the failure and the manufacturer advised that the engine would need to be reset. The VIN was not available. The failure…
Driving at 70mph on the freeway, between two semi trucks, my car dinged at me and the display said, "engine power reduced." I did not know what this meant so I immediately started to try and maneuver between the two trucks and pull over. Seconds later, the warning bells happened again and the error message was "engine disengaged." the car turned itself off! I coasted over to the berm. To be…
Had engine trouble with your 2006 Chevrolet HHR?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2006 Chevrolet HHR?
It's a documented issue but not catastrophic. 39 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 34 complaints that reported odometer mileage, most engine failures cluster between 46,290 and 97,000 miles, with the median around 74,504. A quarter of owners report trouble before 46,290; a quarter make it past 97,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2006/Chevrolet/HHR.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.