This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗2006 Chevrolet Cobalt engine problems
severe 57 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
57
Recalls
0
Avg fix
$3,100
4crashes
When does it fail?
Of the 57 engine complaints filed for the 2006 Chevrolet Cobalt, 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
Owners have filed 57 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 #2 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 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
Stalling is the dominant complaint across this cluster. Owners describe the engine cutting off without warning at low speeds (under 70 mph), particularly at stops, traffic lights, and during stop-and-go driving. The car typically restarts but the failure recurs days, weeks, or sometimes multiple times daily. Many owners drove hundreds of miles to a dealership only to have the shop claim they could not replicate the problem—a nightmare scenario when a $600 diagnostic fee hangs over your head.
Repair attempts have included coil packs, catalytic converters, starters (replaced twice on one car), fuel injectors, O2 sensors, spark plugs, MAF sensors, even timing chains and full engine rebuilds. None of these fixed the stalling in the narratives provided.
A secondary thread involves the catalytic converter failing repeatedly within warranty periods. One owner got three replacements; a fourth failure followed shortly.
Other repeated issues: rough idle and stalling when the A/C or heater kicks on; throttle body sensor faults causing power loss; head gasket and internal engine damage after overheating; and a muffler baffle design flaw where baffles rattle loose but no replacement part exists from the factory.
Owners cite electrical system recalls (14V047000, 14E021000) and a power steering recall, though parts availability delays and dealer hesitation to perform the work appear in several complaints. One owner's car stalled on a highway and nearly caused a rear-end collision. Another lost all function (steering, brakes, transmission lockout, throttle) after lightning struck the car.
Same Chevrolet Cobalt engine reports on nearby years: 2005 · 2007 · 2008 · 2009
Failure modes owners describe
Engine stalling at low speed or while driving
Engine cuts off without warning at speeds under 70 mph, particularly at stops, stop lights, or while slowing down. Restart typically successful. Occurs intermittently and unpredictably, sometimes once a week, other times multiple times daily or across weeks without incident. No diagnostic codes often present.
When: First occurrence reported between 10,000–120,000 miles; spans all mileage ranges up to 160,000 miles
Symptoms owners cite: Engine shuts off without warning; No check engine light or warning lights in many cases; Car restarts normally after stalling; Occurs randomly during stop-and-go traffic, at traffic lights, highway driving, and low-speed maneuvers; Sometimes preceded by rough idle or RPM fluctuation
Codes mentioned: P0300 (random/multiple cylinder misfire), P060E (indeterminate fault)
Repairs/costs cited: Multiple repairs attempted and failed: coil pack, catalytic converter, starter (replaced twice), fuel injectors, O2 sensor, ignition coil, spark plugs, MAF sensor, timing belt/chain, crankshaft sensor. Dealers unable to diagnose or replicate in 95% of cases.
Recalls/TSBs owners mention: Recall 14V047000 (Electrical System); Recall 14E021000 (Electrical System); Recall campaign ID 10V073000 (Steering). Owner reported recall parts not available. Ignition switch recall performed in some cases.
Catalytic converter failure (repeated)
Catalytic converter fails multiple times within short ownership period, reported as clogging. First two failures covered under factory and extended warranty; subsequent failures also covered under extended warranty initially, then further failures occur.
When: First failure under 30,000 miles; subsequent failures; fourth failure reported before 83,000 miles total ownership
Symptoms owners cite: Hesitation upon acceleration; Loss of power for several seconds before stalling; Engine light illumination
Codes mentioned: Catalytic converter clogging codes (specific codes not listed)
Repairs/costs cited: Catalytic converter replaced three times under warranty; fourth failure occurred. Dealers diagnosed clogging as cause.
Recalls/TSBs owners mention: First replacement: factory warranty (3 year/30,000 mile). Second and third replacements: extended warranty. Fourth failure: not repaired as of report date.
Rough idle and stalling when heater/AC activated
Engine stalls when heating or air conditioning system is turned on, whether car is at idle or driving. Occurs when A/C or heater engaged; car restarts immediately when system turned off. Loss of power steering and other electrical systems also occur.
When: Multiple occurrences; no specific mileage noted
Symptoms owners cite: Engine stalls when heater or A/C engaged; Loss of power steering simultaneous with stall; Loss of all power functions; No check engine light displayed; Idle drops to 500 RPM with A/C on, surges to 1000 RPM on recovery
Codes mentioned: No codes displayed in most cases
Repairs/costs cited: PCM reprogramming performed in at least one case; not covered under extended warranty per owner report.
Recalls/TSBs owners mention: TSB (Technical Service Bulletin) noted for idle control issue; PCM reprogramming required but not warranty-covered.
Head gasket and internal engine damage
Engine overheating leads to head gasket failure. Repair attempts by multiple mechanics, including GM dealer, resulted in incomplete repairs and further damage discovery (worn piston rings, crankshaft bearings, exhaust camshaft damage, damaged lifters and rollers). Subsequent electrical damage from storm affected ECM and other components.
When: Reported at low mileage; damage escalated over time following initial overheating incident and failed repairs
Symptoms owners cite: Engine overheat; Head gasket failure; Internal engine noise; Continued overheating after head gasket replacement; Engine hunting/hunting idle after subsequent electrical damage; Throttle body malfunction; No stable idle
Codes mentioned: ECM malfunction codes
Repairs/costs cited: First shop replaced head gasket ($2,300 insurance paid); subsequent damage not addressed. GM dealer claimed to replace head and gasket but allegedly did not install new head. Third repair: full engine rebuild with new pistons, rings, crankshaft bearings, exhaust camshaft, lifters, rollers.
Recalls/TSBs owners mention: GM service department initially handled repair (claimed replacement of head and gasket); warranty/recall coverage not mentioned.
Timing chain/belt failure
Timing chain or belt fails while driving, causing engine stall and inability to restart. Vehicle requires towing and engine replacement.
When: Reported at 57,000 miles in two separate complaints
Symptoms owners cite: Engine stalls without warning; Engine does not restart; No power
Codes mentioned: Timing chain failed (mechanical diagnosis)
Repairs/costs cited: Timing chain diagnosed as failed; engine replacement required. Not repaired per owner reports.
Recalls/TSBs owners mention: Manufacturer made aware of failure in at least one case.
Throttle position sensor/throttle body malfunction
Throttle position sensor or throttle body fails, causing engine power reduction, check engine light, and abrupt loss of acceleration control. Gas pedal becomes overly sensitive or unresponsive.
When: Various mileages; one case at low mileage; one case at 40,000 miles
Symptoms owners cite: Check engine light illumination; Engine power reduced message; Abrupt loss of power; Gas pedal overly sensitive or unresponsive; Traction control light may illuminate; Sluggish acceleration
Codes mentioned: Throttle position sensor codes, P060E (indeterminate fault)
Repairs/costs cited: O2 sensor installed in one case with no resolution. Throttle body sensor and O2 sensor replacements mentioned; some repairs unsuccessful.
Recalls/TSBs owners mention: Owner reported on fourth recall related to this issue.
Muffler baffle failure
Muffler baffles deteriorate and rattle inside the muffler unit. No aftermarket or dealer part available for replacement at time of complaint.
When: Reported at 3 years of ownership; design flaw, not impact-related
Symptoms owners cite: Rattling noise from muffler; Baffles loose inside muffler
Repairs/costs cited: Multiple service shops unable to install replacement muffler; Chevy had not released muffler part; dealer wanted $550 for muffler replacement; not covered under extended warranty.
Recalls/TSBs owners mention: Chevy has not released replacement muffler part for 2006 Cobalt SS per dealer statement; extended warranty does not cover.
Oil filter gasket leak
Oil filter gasket fails to seal, allowing oil to leak from the oil filter housing. Design flaw in gasket or cap prevents proper seal.
When: No specific mileage provided
Symptoms owners cite: Oil leak from oil filter cap/housing; Loss of oil while vehicle running
Repairs/costs cited: Identified as design flaw in oil filter cap and gasket; repair not detailed.
ECM/PCM/BCM and electrical system failures
Engine control module, powertrain control module, and body control module malfunction. Reported alongside stalling, misfire codes, and power loss. One owner reported odometer rollback and five service attempts for computer issues.
When: Reported at various mileages including low mileage (13,000)
Symptoms owners cite: Check engine light illumination without clear cause; Multiple random misfire codes on cylinders; Electrical system malfunction affecting multiple components; Odometer anomalies (rollback reported in one case)
Codes mentioned: Random misfire codes (cylinders 1 and 4 reported), P0300, Multiple unspecified codes
Repairs/costs cited: Five service visits for computer issues in one case; specific repairs not detailed. PCM reprogramming in one case. Alternator and voltage regulator damage from electrical storm in another case.
Recalls/TSBs owners mention: Recall 14V047000 and 14E021000 (Electrical System) relevant; parts availability issues reported.
Fuel pump and fuel system issues
Fuel pump failure and fuel system malfunction, including abnormal fuel odor and fuel leaks. Fuel evaporative system issues reported in conjunction with misfire diagnostics.
When: Reported at various mileages; one case at 81,744 miles
Symptoms owners cite: Check engine light illumination; Abnormal fuel odor; Fuel leak; Engine shutoff and difficulty restarting; Fuel evaporative system malfunction
Codes mentioned: Fuel system codes (not specified), Evaporative emission system codes
Repairs/costs cited: Fuel injector cleaner and higher octane fuel tried without resolution in one case. Fuel pump relay replaced in one case. Fuel module replacement mentioned; issue persisted.
Recalls/TSBs owners mention: Owner reported owner research showing 1000+ complaints online; dealer stated vehicle not included in recall.
Synthesized from 57 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Tl* the contact owns a 2006 Chevrolet cobalt. While driving approximately 50 MPH, the engine stalled. The vehicle was not able to restart. The vehicle was towed to a mechanic where it was diagnosed that the timing belt needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The VIN was unavailable. The approximate failure mileage was 57,000.
Had engine trouble with your 2006 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 2006 Chevrolet Cobalt?
It's a meaningful issue. 57 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 46 complaints that reported odometer mileage, most engine failures cluster between 30,000 and 89,000 miles, with the median around 62,551. A quarter of owners report trouble before 30,000; a quarter make it past 89,000. 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/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.