This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
full bulletin at NHTSA ↗2007 Chevrolet Cobalt engine problems
critical 48 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
48
Recalls
0
Avg fix
$3,100
7crashes
3fires
5injuries
1fatality
What stands out
Owners have filed 48 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.
Among the 6 model years of Chevrolet Cobalt in our records for engine problems, this one ranks #3 by owner-complaint volume.
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 2007 Cobalt exhibits critical engine failures that strike without warning and bypass manufacturer protection. Timing chain breaks stand out as the most expensive catastrophe—the chain snaps anywhere from 79,000 to 175,000 miles, bending valves, damaging pistons, or cracking the block. Owners pay $4,500–$5,000 for engine replacement because GM denies warranty coverage. Many report hearing a loud knocking noise before failure or struggling to start the car days beforehand, but no recall addresses this known defect.
Stalling is another widespread pattern. Vehicles stall during normal driving or at traffic lights with zero warning, sometimes accompanied by an "engine power reduced" message. Multiple mechanics fail to diagnose the root cause, and even dealer recalls (campaign 14E021000) don't fix it—parts aren't available or repairs fail to prevent recurrence.
Fuel system problems create fire hazard. Owners smell strong gasoline in and around the vehicle; mechanics find corroded plastic fuel lines leaking onto hot exhaust manifolds. One owner reports fuel dripping directly onto the exhaust pipe.
A smaller cluster reports spontaneous fires—vehicles ignite while parked at stop signs or after minor low-speed collisions, with flames spreading so fast occupants cannot escape. One fatal crash involved a Cobalt that caught fire immediately after hitting a pole; the driver could not unbuckle his seatbelt before being overcome by caustic fumes.
Rough idle, hard starting, power steering loss, and rough engine operation round out the pattern. Owners also report uncontrolled acceleration, electrical faults in the instrument cluster, and complete loss of power while driving. Most repairs at dealerships fail to resolve recurring issues. No manufacturer recalls address the timing chain defect or most stalling complaints.
Same Chevrolet Cobalt engine reports on nearby years: 2005 · 2006 · 2008 · 2009 · 2010
Failure modes owners describe
Timing chain failure
Internal timing chain breaks, causing severe engine damage (bent valves, damaged pistons, holes in piston heads, or complete engine seizure). Owners report the chain snapping with little to no warning, rendering the engine inoperable and requiring full engine replacement.
When: Typically between 79,000 and 175,000 miles; one case reported at 110,000 miles
Symptoms owners cite: Engine won't start or turn over; Loud knocking noise from engine before failure; Difficulty starting with prolonged cranking or multiple attempts required; Car suddenly dies while driving
Repairs/costs cited: Full engine replacement: $4,500–$5,000. Dealers initially refused warranty coverage on timing chain failure. Independent mechanics confirmed this is a known defect.
Recalls/TSBs owners mention: No recalls issued for timing chain defects. GM denied warranty coverage; owners report no assistance from manufacturer.
Stalling without warning
Vehicle stalls suddenly during normal driving or while stopped at lights/signs, often accompanied by loss of power steering and brake assist. Occurs repeatedly even after dealer service attempts under manufacturer recalls. No consistent diagnostic codes or reproducible faults found by technicians.
When: Reported between 30,000 and 137,000 miles; one case at 45,000 miles
Symptoms owners cite: Engine power reduced warning message displays; Vehicle suddenly stalls while driving or at traffic lights; Loss of all power (steering, braking, lights); Vehicle shakes violently before stall; Stalling recurs multiple times despite repairs; Vehicle accelerates uncontrollably before stalling
Codes mentioned: Check engine light (code 0410 mentioned in one case)
Repairs/costs cited: Dealer service under campaign 14E021000 attempted but parts unavailable or repairs failed to prevent recurrence. Multiple mechanics unable to diagnose root cause. One owner reported three different mechanics and several part replacements with no resolution.
Recalls/TSBs owners mention: Campaign 14E021000 recall attempted but part availability issues prevented completion. Manufacturer did not resolve recurring stalling.
Engine power reduced / limp mode activation
Vehicle enters reduced power mode with engine power dramatically cut and severe acceleration loss, limiting speed to 10 mph or less. Warning message 'engine power reduced' appears on dashboard. Vehicle shakes violently. Condition recurs within minutes of restart, making the car unsafe and undriveable.
When: Repeated incidents within 10 minutes; owner stranded on freeway
Symptoms owners cite: Engine power reduced warning displays; Severe acceleration loss (cannot exceed 10 mph); Vehicle shakes violently; Vehicle lurches forward unexpectedly when put in park; Condition repeats every 10 minutes during operation
Repairs/costs cited: Three different mechanics unable to resolve after multiple repairs and part replacements. Vehicle remains unsafe to operate.
Recalls/TSBs owners mention: No manufacturer response reported.
Rough idle and hard starting after fuel fill
Vehicle begins to idle roughly and hesitate starting, especially after refueling. Owner must give the engine fuel (rev it) to smooth idle. Problem develops after extended dealer attempts to repair misfiring and acceleration issues.
When: Starting at 50,000 miles; escalating around 88,000 miles
Symptoms owners cite: Engine misfires at low speeds; Uncontrolled acceleration and lunging at stops; Rough idle; Difficulty starting, especially after refueling; Engine will not turn over without revving
Repairs/costs cited: Dealer replaced fuel pedal sensor, engine computer, wiring harness, and rebuilt cylinder head—all unsuccessful. Owner has three of four warranty work receipts needed for lemon law claim; fourth receipt withheld by dealer.
Recalls/TSBs owners mention: No recall coverage for these issues. Lemon law claim blocked due to missing fourth receipt.
Complete loss of engine power while driving
Engine dies suddenly while vehicle is in motion with no warning. Vehicle loses all electrical power (lights, controls, braking assist) and becomes uncontrollable. Can result in inability to steer or brake, leading to crashes and injury.
When: Reported between 45,000 and 125,000 miles
Symptoms owners cite: Engine shuts off with no warning; Complete loss of power (lights and controls go dark); Vehicle loses control on freeway or at intersections; Unable to restart vehicle
Repairs/costs cited: One case: dealer wanted $3,800 for full engine replacement. Another case: dealer found 'nothing mechanically wrong,' codes erased, insurance paid for damage.
Recalls/TSBs owners mention: No manufacturer support reported. Dealer diagnostics inconclusive or unhelpful.
Fuel leak and strong fuel odor
Plastic fuel system components corrode or fail, causing fuel to leak onto hot engine components or exhaust manifold. Creates strong gasoline smell inside and outside vehicle. Presents serious fire risk.
When: Reported between 90,000 and high mileage vehicles
Symptoms owners cite: Strong fuel smell inside and outside vehicle; Fuel dripping from undercarriage; Trouble starting; Overpowering gasoline odor while driving
Repairs/costs cited: Corrosion in axle fuel lines identified; fuel lines need replacement. One owner reported fuel leaking directly onto exhaust pipe. Plastic fuel system components noted as defective.
Recalls/TSBs owners mention: Special coverage program mentioned in one case but declined to perform repair. Manufacturer documented fuel leak issues in one vehicle previously repaired under unknown recall.
Low cylinder compression and spark coil failures
One or more cylinders develop low compression (74 psi reported), causing inspection failure. Multiple ignition spark coils fail in succession (four reported in one case). Compression and coil failures may indicate deeper engine degradation.
When: At 79,000 miles; vehicle 9 years old with regular 3,000-mile oil changes
Symptoms owners cite: Low compression in one cylinder (74 psi, well below normal 150+ psi); Multiple spark coil failures; Inspection failure
Repairs/costs cited: Owner changed oil every 3,000 miles with special corrugated paper filter (added cost $12+). No history of overheating or prior issues. Vehicle has been stationary since May pending repairs.
Recalls/TSBs owners mention: No manufacturer acknowledgment of premature spark coil or compression failure patterns.
Engine overheating and coolant system failure
Engine temperature rises to critical levels (240–304°F) with cooling system unable to maintain safe temperatures. Fan cycles on and off ineffectively. Engine dies due to overheating during highway driving.
When: Temperature spike occurred during highway rush-hour traffic
Symptoms owners cite: Temperature warning light illuminates at 240°F; Temperature escalates to 304°F; Cooling fan activates but ineffective; Engine dies while in motion; Mechanic unsure of root cause
Repairs/costs cited: Cause unknown; mechanic considering full engine replacement. Specific failure point not yet identified.
Recalls/TSBs owners mention: No manufacturer response reported.
Engine fire (post-crash)
Vehicle bursts into flames after minor collisions or accidents. Two separate cases reported: one after skidding on gravel, one after hitting a pole. Fires occur immediately post-impact and spread rapidly with caustic fumes, making escape difficult.
When: Immediately following crashes at low to moderate speeds
Symptoms owners cite: Smoke visible immediately after impact; Rapid transition to full-vehicle flames; Caustic fumes from melting interior; Flames prevent occupant exit
Repairs/costs cited: One fatal incident: victim unable to escape due to stuck seatbelt and melting interior. Police officer hospitalized from smoke inhalation.
Recalls/TSBs owners mention: No response to complaint letter. No recalls addressing fire risk after low-speed impacts.
Spontaneous fire while parked or at low speeds
Vehicle ignites spontaneously while parked at a stop sign or during low-speed operation with no prior warning or visible mechanical failure. Fire consumes entire vehicle interior rapidly.
When: While stopped at stop sign; another case at a stoplight
Symptoms owners cite: Smoke rolling out from engine compartment; Rapid escalation to full-vehicle flames; Complete vehicle destruction except trunk/frame
Repairs/costs cited: No prior warning, smoke, or odor. Vehicle destroyed; cause not investigated.
Recalls/TSBs owners mention: No recalled component directly tied to fire by manufacturer in available records. Owner heard about unspecified recall post-fire but unsure of connection.
Exhaust system component failure (rippled flex tube)
Exhaust flex pipe (4.5-inch rippled steel section between muffler and headers) breaks prematurely with no impact damage or visible stress. Steel appears too thin to withstand normal vibrations and engine movement.
When: Failure noted with no evidence of bottoming out or impact
Symptoms owners cite: Exhaust pipe rupture at flexible connection; No dents, scrapes, or visible damage to exhaust
Repairs/costs cited: Owner suspects design defect due to thin steel gauge. No impact or abuse history.
Recalls/TSBs owners mention: No manufacturer acknowledgment of exhaust flex tube design issues.
Bent valves and engine component failure
Engine valves become bent, preventing proper valve operation. Loud knocking noise audible from engine shortly before failure. Engine cannot be restarted after valves bend.
When: At 140,000 miles
Symptoms owners cite: Loud knocking noise from engine; Engine cannot be restarted
Repairs/costs cited: Independent mechanic diagnosis: bent valves in motor. Timing chain failure likely cause of valve damage.
Recalls/TSBs owners mention: Manufacturer notified but no support provided.
Uncontrolled acceleration at stops
Vehicle accelerates on its own when driver attempts to slow down or come to a complete stop. Acceleration can be violent and unpredictable, with speedometer jumping to 80 mph at complete stop without driver input.
When: Random incidents; one case at stop sign, another at stoplight
Symptoms owners cite: Vehicle accelerates without pedal input; Acceleration occurs while attempting to stop; Speedometer jumps to 80 mph while stationary; Engine shuts down after uncontrolled acceleration
Repairs/costs cited: No check engine light or diagnostic codes generated.
Recalls/TSBs owners mention: No manufacturer response documented.
Power steering failure or loss during driving
Power steering system fails or loses assist, making steering extremely difficult or impossible. Failures often occur while driving at highway speeds, resulting in loss of vehicle control and crashes. Power steering light frequently illuminates on dashboard.
When: Reported between 46,000 and 90,000 miles; one case at 90,000 miles causing crash at 60 mph
Symptoms owners cite: Power steering light illuminates on dashboard; Steering becomes very difficult or impossible; Power steering assist stops working mid-drive; Loss of vehicle control; Vehicle stalls simultaneously with power steering loss
Codes mentioned: Power steering lock warning lamp
Repairs/costs cited: Owner in one case received only a head gasket replacement (30,000 miles); power steering failure occurred later. No repairs documented for power steering loss in provided narratives, though it was a known widespread issue.
Recalls/TSBs owners mention: Multiple owners mention multiple people experiencing power steering failures; no recall issued despite widespread complaints. One owner notes hundreds of complaints online with some resulting in accidents.
Engine jerking, hesitation, and backfiring
Engine hesitates when accelerating, jerks at low speeds, and backfires. Symptoms start gradually and become constant. Vehicle may not respond smoothly to throttle input.
When: Starting at 63,000 miles; symptoms constant over two-week period
Symptoms owners cite: Vehicle jerks at 1–2 mph; Hesitation upon acceleration; Engine backfires; Symptoms constant and recurring
Repairs/costs cited: Owner has not yet taken vehicle to dealer or mechanic; unsure of cause.
Recalls/TSBs owners mention: Not yet reported to manufacturer or dealer.
Fuel gauge and instrument cluster electrical faults
Fuel gauge reads empty when tank has fuel. RPM gauge and speedometer flutter between 0 and 20 mph erratically. Security lock indicator and power steering light remain illuminated constantly. Multiple electrical faults occur simultaneously.
When: At 70,000 miles
Symptoms owners cite: Fuel gauge reads empty with fuel in tank; RPM gauge flutters between 0–20 mph; Speedometer flutters between 0–20 mph; Power steering light stays on constantly; Security lock indicator stays illuminated; Engine stalls during operation
Repairs/costs cited: Dealer unable to reproduce failure; vehicle not repaired.
Recalls/TSBs owners mention: Manufacturer notified but no resolution provided.
Catalytic converter premature failure
Catalytic converter fails at only three years old, well before typical service life. Replacement parts are backordered for extended periods, and only original GM converters will fit the vehicle.
When: Only three years old (2007 model, complaint filed around 2010)
Symptoms owners cite: Catalytic converter failure requiring replacement
Repairs/costs cited: GM dealers unable to supply replacements; backordered for up to one month. Aftermarket converters will not fit; only original GM parts compatible. Vehicle exceeds warranty mileage; no warranty coverage available.
Recalls/TSBs owners mention: No warranty coverage due to mileage. No parts availability for repairs.
Check engine light with AER (secondary air injection) codes
Check engine light illuminates with diagnostic code 0410, which relates to secondary air injection system. Burning electrical wire smell accompanies the fault.
When: During operation; not tied to specific mileage in available narrative
Symptoms owners cite: Check engine light illuminated; Burning electrical wire smell from engine; Code 0410 stored
Codes mentioned: P0410
Repairs/costs cited: Owner notes this code is subject to a recall on some Cobalts, but their vehicle is not on the recall list.
Recalls/TSBs owners mention: Recall exists for this code on some models; owner's vehicle excluded from recall despite having same fault.
Limp mode activation with beeping and warning lights
Vehicle enters limp mode (reduced power, sluggish acceleration) accompanied by persistent beeping and illumination of unknown warning light. Failure occurs repeatedly during normal driving.
When: At 177,000 miles
Symptoms owners cite: Abnormal beeping sound; Vehicle enters limp mode; Unknown warning light illuminated; Failures occur on multiple occasions
Repairs/costs cited: Vehicle not diagnosed or repaired.
Recalls/TSBs owners mention: Dealer and manufacturer not notified.
Synthesized from 48 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had engine trouble with your 2007 Chevrolet Cobalt?
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 2007 Chevrolet Cobalt?
It's a serious issue. 48 complaints have been filed, including 7 reports involving a crash and 1 fatality(ies). We've classified it as critical based on NHTSA's reported outcomes.
At what mileage does the engine typically fail?
Across the 39 complaints that reported odometer mileage, most engine failures cluster between 52,300 and 118,000 miles, with the median around 88,000. A quarter of owners report trouble before 52,300; a quarter make it past 118,000. 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/2007/Chevrolet/Cobalt.
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.