2006 Chevrolet Cobalt electrical problems

Ignition switch fails repeatedly, sometimes after the factory recall repair. Key locks in ignition and will not turn off or come out. Engine may not start or starts inconsistently. Switch clicks on and off without driver input.

When: Throughout vehicle's life; recurring post-recall in some cases

Symptoms owners cite: Key stuck in ignition and will not turn to off position; Key will not release from ignition; Engine won't turn over or starts only after multiple attempts; Ignition switch clicking repeatedly; Car will not shut off completely

Codes mentioned: U0121, U2105, U2106, U2108

Repairs/costs cited: Factory recall performed (ignition switch, cylinder, and key replacement); however, defect recurred in multiple cases post-repair. Replacement costs $200–$900+ for independent shops. Dealer parts on backorder 1–3 months. Automatic shifter assembly replacement ($380+) sometimes done alongside ignition work.

Recalls/TSBs owners mention: NHTSA Campaign 14V047000 (air bags, electrical system); Campaign 14V171000 (electrical system); Campaign 10V073000 (power steering). Ignition switch recall initiated but took months to source parts. Dealerships frequently denied problem existed or told owners to pay out of pocket for diagnostics even after recall notice.

Engine suddenly shuts off without warning during normal driving. Occurs at various speeds (25–70 mph), when stopping, turning, idling, or with AC on. Vehicle may restart after a few minutes or require towing. Loss of power steering and brakes follows. Occurs repeatedly even after recall repairs.

When: Occurs throughout vehicle ownership; multiple incidents per owner reported; some worse after recall

Symptoms owners cite: Engine dies without warning while driving; Power loss at traffic lights, stops, or intersections; Power loss when turning the steering wheel; Power loss when AC is running; Car hesitates or stumbles during acceleration after stopping; Power steering becomes hard to turn or locks up; Brakes become unresponsive; Check engine light and TC light illuminate

Codes mentioned: PO300 (random misfire codes)

Repairs/costs cited: Shops replace ignition module, spark plugs, fuel filters, and clean throttle body with only temporary improvement. One owner paid for ignition module, spark plugs, and fuel filter with no resolution. Another's brother cleaned throttle body, which helped slightly but hesitation persists. No lasting fix reported despite multiple repair attempts.

Recalls/TSBs owners mention: No manufacturer response documented. Owners report dealerships claim the vehicle is safe to drive or blame user error. One owner noted this issue recurs even after the ignition switch recall and stated dealership would not cover diagnostics.

Instrument cluster gauges drop to zero or display only dashes. Multiple warning lights (check engine, TC, ABS, power steering, brake) cycle on and off randomly while driving. Anti-theft system engages falsely, disabling gauges, radio, and other systems.

When: Throughout ownership; some cases post-recall or after battery issues

Symptoms owners cite: All gauges drop to zero while driving; Mileage and speed display shows only dashes (--------); Warning lights flash on and off randomly (check engine, TC, ABS, power steering, brake system); Anti-theft system light stays on constantly; Radio stops working; Gauges flicker or work intermittently; Multiple dash icons light simultaneously (described as 'Christmas tree show')

Codes mentioned: U0121, U2105, U2106, U2108

Repairs/costs cited: Dealerships replaced engine computer twice (while under warranty) without lasting fix. Fuses blown in ABS and traction control circuits, traced to short in ignition switch wiring. ABS fuse replacement cost $106.95 (inspection only). Parts replaced include body control module and fuel pressure sensor. Owners report repeated visits produce no resolution.

Recalls/TSBs owners mention: Dealerships claim warning lights unrelated to ignition switch recall. One service manager said he sees this 'all the time with recalls.' No systematic remedy offered.

Engine idles roughly, stumbles, or hesitates when accelerating from a stop. Car may stall at idle or when pulling out into traffic. Problem worsens when AC is on. Occurs especially after refueling or at traffic lights.

When: Throughout ownership; some owners report since purchase

Symptoms owners cite: Rough idle and shuddering at traffic lights; Engine hesitation or stumbling during re-acceleration; Car stalls when pulling out from stops or intersections; Car dies or nearly stalls when AC compressor engages; Engine cutting out intermittently; Difficulty starting after refueling

Codes mentioned: PO300

Repairs/costs cited: Replaced spark plugs, spark plug wires, cooling sensor, and ignition coil with minimal or temporary improvement. Throttle body cleaned in one case. One owner spent $200+ on new battery (third in one year) and fuel treatments with no sustained fix. Multiple repair shops unable to diagnose cause.

Recalls/TSBs owners mention: No manufacturer recalls specifically for rough idle/stalling. Dealers unable to replicate problem or find codes when inspected.

Airbag warning light illuminates and remains lit. Airbag sensor flashes when ignition switch fails. Airbags fail to deploy during crashes caused by engine stalling. 'Service airbag' message appears randomly on dash.

When: Throughout ownership; particularly after ignition switch failure events

Symptoms owners cite: Airbag warning light stays on continuously; Airbag sensor flashes when car stalls; 'Service airbag' message appears randomly on dashboard; Airbags do not deploy during crash; Airbag light turns on and off based on passenger seat occupancy

Repairs/costs cited: Dealership told one owner the airbag sensor is faulty and unrelated to ignition switch repair, and refused to cover repair under warranty. Owner did not pursue out-of-pocket repair. No fix documented.

Recalls/TSBs owners mention: Campaigns 14V047000 and 14V171000 include air bag and electrical system repairs, but owners report dealers deny connection between stalling and airbag failure.

Ignition key becomes stuck and will not turn to the off position or cannot be removed even when engine is off. Automatic transmission shifter locks in park and cannot be moved. These issues occur simultaneously or separately.

When: Throughout ownership; recurring issue for some owners

Symptoms owners cite: Key will not turn to off position; Key will not come out of ignition after shutting off engine; Shifter button stuck and will not press to move out of park; Shifter locked in park despite brake being applied; Engine shuts off but key remains in accessory position

Repairs/costs cited: Automatic shifter assembly replacement required; cost $380–$450 per replacement (parts, labor, towing). One owner replaced shifter at 15,000 miles, again at 66,000 miles. Manual emergency key release button under steering wheel used by some owners as workaround. One owner reports using emergency switch to release keys repeatedly.

Recalls/TSBs owners mention: Recall bulletin 06-07-30-004B issued for shifter/lock cylinder inspection, but dealers stated they could not verify complaints. Covered under warranty for first incident, out of pocket for recurring failures.

Wiring harness corroded or damaged, causing intermittent electrical failures. Wires too short to reconnect after damage. Ground wire (G105) near oil filter shorts, causing sudden power loss while driving. Main wire harness to engine damaged, requiring $826 replacement.

When: Throughout ownership; some wiring defects present from early vehicle life

Symptoms owners cite: Corrosion visible on wiring harness under dashboard; Multiple electrical component failures with no single root cause; Sudden power loss traced to ground wire short; Wires too short to reconnect to engine connectors; Battery drain even with new battery installed

Codes mentioned: U0121, U2105, U2106, U2108

Repairs/costs cited: Wiring harness replacement cost $826 at dealership when animal chewed main connector. One owner's mechanic discovered corroded wiring under dash after power steering recall. Entire wiring harness may need replacement; parts on backorder.

Recalls/TSBs owners mention: No manufacturer acknowledgment of systemic wiring defect. Dealership charged owner for wiring replacement even though animal damage occurred during vehicle ownership.

Battery drains prematurely despite being new. Starter motor fails and must be replaced. Multiple battery replacements required within short timeframes (three new batteries in one year reported).

When: Throughout ownership; some cases post-recall

Symptoms owners cite: Battery goes dead overnight or after short periods of sitting; Starter motor does not crank or makes dragging noise; Multiple attempts needed to start engine; Check engine light and battery warning light illuminate; New battery fails to hold charge

Repairs/costs cited: New starter installed ($200+ for part, $600+ for labor at some shops). Multiple battery replacements in one year ($$$). One owner paid $102 towing fee and $600+ for starter repair after dealership misdiagnosed as ignition switch. Battery replacement under recall but repeated drains suggest ongoing electrical draw.

Recalls/TSBs owners mention: Campaigns 14V047000 and 14V171000 may include battery replacement. One owner received a battery swap after recall paperwork noted low battery test, but problem recurred.

Power steering becomes hard or locks up intermittently. Steering wheel becomes impossible to turn manually when power is lost. Power steering warning light illuminates. After power steering recall repair, problem worsens or recurs.

When: Throughout ownership; some cases worse post-recall; duration of 7+ months reported for one owner

Symptoms owners cite: Steering wheel hardens and becomes difficult or impossible to turn; Power steering warning light illuminates; Steering wheel locks up while driving or parked; Power steering fails along with engine stall; Car drives sluggish like it will stop in traffic

Repairs/costs cited: One owner's mechanic unable to detect the problem due to intermittent nature. Dealer estimate ranged $200–$900. Power steering monitor replacement suggested post-recall ($$$). After power steering recall was performed, one owner reports problem got worse—car now drives 'as loud as a 5th wheeler truck' and becomes uncontrollable below 15 mph.

Recalls/TSBs owners mention: Campaign 10V073000 covers electric power steering. One owner states dealer was unable to pinpoint failure and could only suggest corroded wiring harness (not repaired). Another reports dealer performed power steering monitor replacement post-recall with minimal improvement.

Power door locks lock and unlock themselves repeatedly without driver input. Locks remain engaged even when deliberately unlocked. Lock buttons non-responsive or inconsistent.

When: Throughout ownership; one case reported starting 2008, ongoing

Symptoms owners cite: Door locks engage and disengage repeatedly while driving and parked; Locks will not stay in unlocked position; Alarm cannot be disengaged; Manual entry required after locks malfunction

Repairs/costs cited: One owner disconnected electric locks as a workaround. No dealer repair documented.

Recalls/TSBs owners mention: No recall or TSB noted. Dealership charges diagnostic fee ($95+) to investigate.

Interior door handle will not open from inside; driver must roll down window to use exterior handle. Chrome door handle edge is sharp and dangerous. Door latch mechanism sticks or fails to hold door closed.

When: Throughout ownership; recurring issue

Symptoms owners cite: Interior door handle will not open; exterior handle opens door; Sharp chrome edge on interior handle; Door latch does not hold door fully closed; Door panel clips won't stay in place; Exterior door seals fail; water leaks into car; Door rusting on driver side despite owner care

Repairs/costs cited: One owner's daughter received stitches (internal and external) from sharp handle edge; required hospital visit. Medical bills and missed wages not reimbursed despite insurance claim pending 7 months. Door seals replaced under warranty but issue recurred. New door panel clips installed without fixing underlying problem.

Recalls/TSBs owners mention: Vehicle working as designed per dealer statement regarding interior handle. No safety bulletin or recall issued for sharp handle edge.

Headlights aim downward excessively, forcing driver to squat in seat to see road at night. One collision with deer due to poor visibility. Single headlight fails intermittently; bulb and wiring replaced without resolution.

When: Throughout ownership; intermittent and recurring

Symptoms owners cite: Headlights point too far downward; Driver cannot see road at night without adjusting position; Single headlight fails intermittently; Headlight aims not adjustable to proper height despite multiple dealer visits; Headlight cannot be repositioned correctly

Repairs/costs cited: Headlights adjusted multiple times at dealer with no lasting improvement. New bulbs and wiring installed without fixing aim defect. No parts list cost provided.

Recalls/TSBs owners mention: No recall or TSB issued. Dealer adjusted aim multiple times without success.

Rear windows roll down by themselves while driving. Window regulators malfunction. Clock on dashboard resets to 12:00 repeatedly. AC and heating stop working, sometimes after dealer service.

When: Throughout ownership; ongoing

Symptoms owners cite: Rear windows open themselves slightly while driving; Windows difficult to operate manually; Clock resets to 12:00 every time engine starts; AC and heat stop working simultaneously after dealer service; Power windows unresponsive

Repairs/costs cited: Owner manually rolls windows up repeatedly. Clock reset is persistent annoyance. After dealer replaced fuse for ABS/traction control, AC and heat stopped working; repair shop diagnosed AC/heat issue as unrelated but cause remains unclear.

Recalls/TSBs owners mention: No manufacturer response documented.

Engine revs to maximum RPM without driver input. Occurs when cruise control is engaged (resume button) or during normal driving. Brakes provide only partial slowdown due to high speed. Cruise coast function does not work.

When: Freeway speeds, 40–60 mph

Symptoms owners cite: Accelerator goes to floor on its own; Engine revs uncontrollably at freeway speeds; Cruise control resume causes uncontrolled acceleration; Brakes only partially slow vehicle during event; Cruise coast does not work to slow vehicle; Event lasts several minutes then resolves on its own

Repairs/costs cited: Dealer test drive (18 miles) could not replicate issue. Diagnostic tests showed no codes or events recorded. Incident described as random and intermittent.

Recalls/TSBs owners mention: General Motors opined the issue is impossible, per owner complaint. Dealership unable to diagnose.

Automatic transmission shifts hard or will not shift into gear. Shifter sticks or requires repeated attempts to move out of park. Shifter button stuck and won't press. Transmission bucking or erratic behavior.

When: Throughout ownership; recurring in some cases

Symptoms owners cite: Difficulty shifting into and out of gears; Shifter button stuck and cannot be pressed; Shifter will not move out of park; Transmission bucks or shudders during shift; Shifter moves without applying brake (safety issue)

Repairs/costs cited: Automatic shifter assembly replacement ($380–$450). One owner replaced shifter twice (at 15,000 and 66,000 miles). Another reports using manual emergency release switch under dash as persistent workaround.

Recalls/TSBs owners mention: Service bulletin 06-07-30-004B covers shifter/lock cylinder. Replacements covered under warranty initially; out-of-pocket after warranty expiration.

Brakes wear unevenly in front; pads and rotors require premature replacement. Brake pedal goes to floor after bleeding. Hard to bleed brakes; multiple attempts (6+) needed to get pressure. Anti-lock brakes lock up completely in one case.

When: Throughout ownership; recurring after repair

Symptoms owners cite: Front brake pads wear unevenly; Rotors and calipers require replacement; Brake pedal travels to floor; no pressure feedback; Brakes difficult to bleed; multiple attempts required; Anti-lock brake system locks up completely; ABS fuse blows repeatedly

Codes mentioned: U0121, U2105, U2106, U2108

Repairs/costs cited: Rotors, pads, and calipers replaced (first job ~$XXX). Second brake job: both front rotors and calipers replaced again. Bleeding procedure took 2 hours and 6 cycles; pedal still went to floor. Problem resolved overnight on own initiative. ABS fuse replacement ($106.95 inspection cost).

Recalls/TSBs owners mention: No TSB or recall for brake bleeding issues. Shops performed work but problem recurred.

Evaporative emission system (evap) leak causes fuel vapor leaks. Gas leak from tank that could cause fire. Fuel pressure sensor failure. Difficulty starting after refueling.

When: Throughout ownership; gas leak incident led to fire on second incident

Symptoms owners cite: Difficulty starting car after refueling; Gas vapors leak from fuel tank; Fuel odor; potential fire hazard; One vehicle caught fire due to gas leak (two separate incidents); Fuel cap vent malfunction

Repairs/costs cited: Gas leak found during 2013 service (initially misdiagnosed as starter issue); vehicle caught fire in August 2014, then again in October 2014. Fuel tank evap system has non-serviceable component that breaks; entire tank must be replaced (expensive). One owner notes part breaks on top of tank causing vapor leak.

Recalls/TSBs owners mention: Gas leak noted in recall paperwork but owner states dealer never disclosed danger. Recall parts were on backorder at time of second fire. Campaign 14V171000 (electrical system) and 14V047000 (air bags, electrical system) may address some fuel system electrical issues.

Recall parts unavailable for extended periods (1–5 months). Dealerships provide conflicting information about order dates and part availability. Poor communication from dealership and GM customer service. Owners forced to drive unsafe vehicles while waiting.

When: 2013–2014 during peak recall period

Symptoms owners cite: Parts ordered but no delivery date given; Multiple calls to dealership yield 'call back next week' responses; Conflicting information about when parts were ordered; Order dates change when cross-checked by owner; GM customer service unable to track part status centrally

Repairs/costs cited: One owner waited 46 days total (22-day delay plus 24-day wait after first contact). Another ordered in April, still waiting in mid-September (5+ months). Dealership wait time estimates: 14–21 days initially, then 30–45 days stated on follow-up. One owner called senator to expedite recall; car ready 4 hours later.

Recalls/TSBs owners mention: Campaign 14V047000 and 14V171000 recall notices sent, but parts sourcing failed. GM offered no loaner cars for extended waits in most cases. One dealership eventually provided rental car but charged owner $192 in unexpected fees.