This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
full bulletin at NHTSA ↗2008 Chevrolet HHR engine problems
severe 13 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
13
Recalls
0
Avg fix
$3,100
2crashes
1injury
When does it fail?
Of the 13 engine complaints filed for the 2008 Chevrolet HHR, here's the actual mileage breakdown — failures cluster heaviest at 100,000-125,000 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
No new NHTSA engine complaint has been filed on this vehicle in over 11 years — the issue may be aging out of the active population.
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 bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
full bulletin at NHTSA ↗This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗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 service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2008 Chevrolet HHR cluster shows a constellation of engine and engine-related failures that span cooling, ignition, stalling, and exhaust systems. Exhaust flex-hose cracking and rust-through is the most consistent complaint—appearing in multiple narratives—causing fumes to seep into the cabin, particularly at idle or when the heater runs. Owners report dealers demanding full exhaust-pipe and catalytic-converter replacement ($900–$2000) rather than fixing the flex hose alone. GM has denied warranty coverage on flex-hose failures beyond 80,000 miles on emissions grounds.
Unexplained stalling is another recurring theme. Multiple owners report vehicles stalling without warning—one at 50 mph, another while turning, others after hitting a pothole or just sitting at a traffic light—sometimes resulting in loss of steering and brakes, collisions, and injury. In one case, the same timing-belt failure recurred four times. Dealers have been unable to reproduce or diagnose these stalling events.
Separately, owners report overheating cycles (one vehicle overheated four times in one year), radiator and A/C condenser damage from road debris with repeated $600 repairs, an oil-pump failure at 138,000 miles that destroyed the engine, and a burning smell with simultaneous power-brake and steering loss. Several complaints note dealers' inability to find the root cause, even after multiple visits.
Same Chevrolet HHR engine reports on nearby years: 2006 · 2007 · 2010 · 2011
Failure modes owners describe
Exhaust flex hose cracking and rust-through
Flex hose immediately downstream of exhaust manifold and ahead of catalytic converters develops cracks and rusts through, allowing exhaust fumes to leak into cabin. Occurs repeatedly on same vehicles. Dealers refuse to replace only the flex hose; insist on full pipe replacement with both catalytic converters at $900–$2000.
When: 2008 model; no specific mileage cited in most complaints; complaint #8 at 82,419 miles
Symptoms owners cite: Loud exhaust noise resembling diesel truck; Exhaust fumes seeping into cabin during idle; Carbon monoxide exposure risk; Smell of exhaust fumes in cabin; Fumes present when heater is on
Repairs/costs cited: Flex hose replacement and catalytic converter replacement estimated $900–$2000; GM denied warranty claim on complaint #8 citing 80,000-mile emissions warranty threshold
Recalls/TSBs owners mention: Dealer refuses partial flex-hose replacement; requires full pipe assembly and both catalytic converters. GM cited emissions warranty limit in complaint #8.
Timing belt failure with repeated recurrence
Timing belt fails without warning, causing stalling. Owner reported the failure recurred four times total with identical diagnosis and repair each time from same independent mechanic. Manufacturer advised taking vehicle to Chevrolet dealer.
When: At 140,000 miles
Symptoms owners cite: Vehicle stalls without warning at traffic light; Loss of power; Stalling recurs after repair
Repairs/costs cited: Timing belt replaced multiple times (four repairs for same failure mode)
Recalls/TSBs owners mention: Manufacturer notified; advised taking vehicle to Chevrolet dealer for diagnosis and repair
Unexplained stalling and deceleration with inability to diagnose
Vehicle decelerates on its own and stalls intermittently while driving at highway speed. Engine warning light illuminates. Dealer unable to reproduce issue or identify root cause. Manufacturer notified but no repair made.
When: At 133,000 miles
Symptoms owners cite: Vehicle decelerates on its own; Intermittent stalling while driving at 50 mph; Engine warning indicator illuminates; Can be restarted after stall
Repairs/costs cited: Vehicle not repaired; cause not identified
Recalls/TSBs owners mention: Manufacturer notified; no resolution provided
Stalling without warning—loss of control and crash
Vehicle stalls without warning at unknown speed, causing loss of control. Owner crashed into embankment. Vehicle not taken to dealer for inspection. Driver sustained shoulder injury.
When: At 90,000 miles
Symptoms owners cite: Stalling without warning; Loss of power steering; Loss of vehicle control
Repairs/costs cited: Vehicle not repaired; no diagnosis made
Recalls/TSBs owners mention: Manufacturer notified; no follow-up or remedy offered
Stalling after pothole impact—crash into other vehicle
Vehicle stalls without warning after hitting pothole at low speed, causing loss of control and collision with another vehicle. No dealer inspection or repair performed.
When: At 111,098 miles
Symptoms owners cite: Stalling without warning after pothole impact; Loss of vehicle control; No collision injuries reported
Repairs/costs cited: Vehicle not repaired
Recalls/TSBs owners mention: Manufacturer notified; no resolution provided
Repeated overheating with radiator and cylinder-head failure
Vehicle overheats repeatedly. Radiator and cylinder heads replaced. Dealership acknowledges issue is unexplained (unseen situation) and unable to provide permanent resolution or guarantee against recurrence.
When: Four times within first year of ownership (purchased May 2009)
Symptoms owners cite: Vehicle overheating; Radiator failure; Cylinder-head failure
Repairs/costs cited: Radiator replaced; cylinder heads replaced; no permanent fix achieved
Recalls/TSBs owners mention: Dealership admits inability to resolve underlying cause
Radiator and A/C condenser damage from road debris
Radiator and A/C condenser repeatedly damaged by road rocks and debris. Owner reports repeated failure every three months, with $600 replacement costs each time. Dealer refuses warranty coverage.
When: Recurring throughout ownership
Symptoms owners cite: Radiator damage from road debris; A/C condenser damage from road debris
Repairs/costs cited: $600 radiator replacements required approximately every 3 months
Recalls/TSBs owners mention: GM refused warranty coverage for radiator and A/C condenser damage
Oil pump failure with bent valves and timing-chain skip
Oil pump fails suddenly, causing complete engine failure. Bent valves and timing chain skip as result. Owner reports good maintenance and oil-change history.
When: At 138,000 miles
Symptoms owners cite: Oil pump failure; Complete engine shutdown; Bent valves; Timing chain skip
Repairs/costs cited: Major engine damage; bent valves and timing chain affected
Stalling while turning—undiagnosed, unrepaired
Vehicle stalls when turning. Owner took vehicle to dealership multiple times. Dealers unable to duplicate or diagnose issue. Problem remains unresolved. No loaner car provided during repeated visits.
When: Mileage not stated
Symptoms owners cite: Stalling while turning; Intermittent stalling
Repairs/costs cited: Not repaired; unable to diagnose
Recalls/TSBs owners mention: Dealership unable to identify or fix issue; no loaner vehicle offered
Engine power loss and stalling in humid conditions with fuel smell
Engine cuts out and loses power at random times, especially during humid weather. Constant smell of leaking gasoline noted. No diagnostic details provided.
When: Mileage not stated
Symptoms owners cite: Engine cuts out; Power loss at random times; Worsens in humid conditions; Smell of leaking gasoline
Burning odor, engine shutdown, and loss of brakes/steering
Vehicle produces intermittent burning-hair odor. Engine shuts off, causing simultaneous loss of power brakes and steering. Complaint also notes speaker problems.
When: Mileage not stated
Symptoms owners cite: Burning odor (hair-like smell); Engine shutdown; Loss of power brakes; Loss of power steering
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
I took the car into the shop on 11/15/14 because of a loud exhaust sound. The mechanic advised the flex pipe was leaking and the flex pipe and catalytic converters (2) would need to be replaced. The cost is estimated at about $900. If the car is in idol, the exhaust seeps into the car and could cause carbon monoxide poisoning and death, if the windows are not cracked to allow for ventilation.…
Had engine trouble with your 2008 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 2008 Chevrolet HHR?
It's a meaningful issue. 13 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 10 complaints that reported odometer mileage, most engine failures cluster between 82,219 and 133,000 miles, with the median around 111,098. A quarter of owners report trouble before 82,219; a quarter make it past 133,000. 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/2008/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.