I had to replace the driver side window motor at about 30,000 miles and now the passenger side motor is acting up and will probably have to be replaced - I am currently at 38000 miles. Seeing so many other complaints, including vehicle door fires, this should be recalled. *tr
2008 Chevrolet Trailblazer electrical problems
severe 62 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
62
Recalls
0
Avg fix
$850
10fires
1injury
When does it fail?
Of the 62 electrical complaints filed for the 2008 Chevrolet Trailblazer, 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
Electrical accounts for 32% of every owner complaint on file for this vehicle — the dominant problem area across 12 categories tracked.
Owners have filed 62 electrical 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.
The failure pattern owners describe
Buyer takeaway: The 2008 Chevrolet Trailblazer has a documented pattern of electrical system failures, including ignition switch shutdowns that can kill the engine without warning on the highway, door module fires triggered by rain exposure, fuse box and wiring fires that can ignite the cabin, and repeated charging/starting problems. Many owners report multiple dealer visits, expensive repairs with recurring failures, and a frustrating lack of recalls for the 2008 model year despite identical faults being recalled on 2006–2007 vehicles.
The 2008 Trailblazer electrical system is showing a complex pattern of failure across 62 complaints, with two dominant themes: sudden loss of engine power and fire hazards.
Engine stalling from ignition switch failure is the most serious recurring issue. Owners report the engine dying without warning at highway speeds (55–65 mph), in intersections, and during normal driving. Power steering and brake assist are lost simultaneously, forcing owners to struggle to control the vehicle to safety. Many can restart only after cycling the key or shifting to neutral. Multiple owners report the failure occurring repeatedly over years of ownership. Notably, the 2006–2007 model years have a recall for identical ignition switch failures, but General Motors did not extend the recall to the 2008 model year despite owners describing the exact same malfunction.
Fire hazards constitute the second major cluster. Owners report electrical fires in the fuse box, under-hood relays, door modules, window switches, and wiring harnesses—sometimes while the vehicle is parked overnight. The driver door module is particularly problematic: moisture from rain causes corrosion, leading to short circuits that melt circuit boards and connectors, producing smoke and flames. One owner documented a passenger door fire that melted the door and seat while parked. Again, the 2006–2007 model years have a recall for moisture-related door module fires (184,000+ vehicles), but the 2008 is excluded.
Additional electrical gremlins include alternator/charging system failures causing weak power windows and wipers, headlight relay failures (despite a recall for the 2007), brake light corrosion and circuit failures, blower resistor fires with melted connectors, and airbag sensor/deployment faults. Several owners report being in the shop 13+ times in 3 years with no lasting resolution.
Same Chevrolet Trailblazer electrical reports on nearby years: 2005 · 2006 · 2007
Failure modes owners describe
Ignition switch failure causing stalling
Engine shuts down while driving with no warning, loss of steering and braking assist. Vehicle may not restart on first attempt or may require jiggling the key or cycling to neutral. Multiple owners report repeated failures over vehicle lifetime.
When: Various mileage points: 27k, 61k, 71k, 86k, 90k-100k+
Symptoms owners cite: engine dies while driving; no restart response initially; power steering loss; brake assist loss; need to cycle key or shift to neutral to restart; warning lights illuminate
Repairs/costs cited: Ignition switch replacement; some owners report multiple replacements ($389–$500+); some dealers replace under warranty initially
Recalls/TSBs owners mention: 2005–2007 model years subject to recall; 2008 model year not included in recall despite identical failure mode; some dealers decline to help 2008 owners
Driver door module failure (moisture-related)
Door lock and power window controls in driver door fail when exposed to rain or moisture, with potential for electrical fire due to short circuit in circuit board. Door module corrosion can cause overheating, melting, smoke, or fire. Issue documented in 2006–2007 recall (184k+ vehicles) but 2008 not included.
When: Intermittent; occurs during or after rain; 35k–139k mileage observed
Symptoms owners cite: power window inoperative; door locks fail; door locks cycle randomly; burning odor from door area; window switch charred or melted; failure intermittent, clears when module dries
Repairs/costs cited: Door module replacement quoted $500+ parts plus labor; owners cite high cost due to lack of recall coverage for 2008
Recalls/TSBs owners mention: Recall covering 2006–2007; 2008 model year excluded despite identical failure; owners report manufacturers cite VIN exclusion
Electrical fires in fuse box and under-hood components
Fuse box, relay, and wiring harness overheat and ignite without warning, sometimes when vehicle is parked overnight or during ignition on. Black smoke and flames visible; fires may self-extinguish. Damage to fuses and connectors. Potential for fire spread.
When: Various mileage: 50k, 74k, 89k, 206k; some while parked overnight
Symptoms owners cite: black smoke from fuse box; burning smell; sparks and flames from fuse box or relay area; dashboard lights dim or fail; charred fuses and connectors; melted wiring harness
Repairs/costs cited: Fuse box replacement, accessory board replacement, wiring harness replacement; costs unknown in most narratives
Recalls/TSBs owners mention: No recalls mentioned; dealers informed and in some cases proposed discounts on new vehicle
Alternator/charging system failure
Alternator fails to charge battery or overcharges, causing battery warning light illumination and reduced electrical performance. Some owners report battery checked good but alternator malfunction suspected; others diagnosed with alternator overcharging.
When: Early in ownership (1 month), and at various mileage points (18k, 110k observed)
Symptoms owners cite: battery warning light on 50% of the time; power windows weak or non-functional; wipers barely move in rain; audio system loses power or malfunctions; transmission hesitation; fuel gauge resets while driving
Repairs/costs cited: Alternator replacement; some owners report battery and alternator checked good by independent mechanics
Recalls/TSBs owners mention: Owner's manual notes battery not charging is 'fuel saving feature'; dealers unable to diagnose root cause
Blower motor resistor electrical failure
Blower resistor fails, causing loss of function on certain speed settings. Evidence of electrical fire that has fused harness connectors and melted plastic. Replacement resistor may restore some but not all settings due to charred connectors.
When: Winter 2012 or earlier; replacement performed October 2014 at ~84k–90k mileage
Symptoms owners cite: blower only works on settings 1, 2, 3 (of 0–5); burning smell from heater area; blower inoperative on higher settings; connectors blackened and melted
Repairs/costs cited: Blower resistor replacement; repair does not fully restore all settings due to wiring damage
Headlight failure (relay/wiring)
Low beam headlights fail intermittently or permanently. High beams remain functional. Bulb replacement provides only temporary fix (2–3 days). Fault traced to faulty relay or wiring; no recall for 2008 model year despite 2007 recall for same issue.
When: Various mileage observed; 75k+ noted for intermittent cold-related failure
Symptoms owners cite: low beam headlights go out while driving; daytime running lights fail; high beams remain functional; bulb replacement ineffective long-term; intermittent failure especially in cold
Repairs/costs cited: Bulb replacement temporary; relay or wiring repair needed; fuse 15016745 identified as faulty in one case
Recalls/TSBs owners mention: 2007 model year has recall; 2008 does not despite identical failure mode
Brake light circuit failure
Brake lights fail to illuminate or function intermittently, with some lights blinking on and off without vehicle being on. Voltage regulator corrosion implicated; sockets and wiring corrode. Multiple dealer attempts to repair only provide temporary fixes.
When: 6k–50k+ mileage
Symptoms owners cite: brake lights not working or intermittent; rear lights blink on/off unprompted; lights corroded; cannot determine when lights are functioning
Repairs/costs cited: Socket replacement (temporary fix), alternator replacement, wiring repair attempted; failures recur
Airbag system electrical faults
Airbags deploy without collision or warning. Driver-side airbag warning light illuminates and stays on for extended periods (months). Sensor malfunction suspected. Multiple warning lights illuminate on dashboard. One case of both curtain airbags deploying simultaneously.
When: Various mileage; one case at 84k, warning light persisted 5+ months
Symptoms owners cite: airbag deploys without accident; driver-side airbag warning light on continuously; multiple dashboard warning lights; inability to clear warning lights; physical injury from improper deployment
Repairs/costs cited: No repairs completed in narratives; dealership unable to diagnose; damage estimated $4k for one deployment case
Power distribution box ribbon wiring overheat/fire
Copper ribbon wiring in electrical power distribution box under left rear seat overheats and ignites papers and vehicle interior, resulting in complete vehicle fire. Circuit breaker fails to trip. Defect attributed to design change from discrete wires to copper ribbon foil.
When: No specific mileage given
Symptoms owners cite: copper ribbon overheats; fire starts in cabin; circuit breaker does not activate; entire vehicle fire
Multiple electrical module failures requiring repeated replacement
Entire electrical system shuts down intermittently, requiring multiple module replacements (OnStar module, various electrical modules). Check Engine and StabiliTrak lights cycle on and off. Vehicle in shop repeatedly for electrical diagnostics.
When: Day purchased (new in 2008); failures recurring for 3+ years of ownership
Symptoms owners cite: all lights, locks, blinkers, gauges fail; OnStar module malfunction; Check Engine light intermittent; StabiliTrak light intermittent; system resets unprompted
Repairs/costs cited: OnStar module replacement; multiple other electrical module replacements; 13+ shop visits in 3 years
Passenger door window electrical fire
Door caught fire while parked, with circuit board in door panel identified as source by fire department. Front passenger window inoperative. Door and front seat melted from fire that smoldered overnight.
When: 206k mileage; overnight parked
Symptoms owners cite: fire in passenger door; door and seat melted; wiring melted inside door
Recalls/TSBs owners mention: No recalls found; vehicle not serviced or diagnosed
Power window switch electrical fire
Power window switch melted and charred while vehicle parked. Window erroneously rolled down on its own. Electrical burning odor present.
When: 139k mileage
Symptoms owners cite: window switch charred and melted; window opens on its own when parked; burning electrical odor
Repairs/costs cited: Not repaired; cause not diagnosed
Recalls/TSBs owners mention: Manufacturer notified; no response documented
Rear hatch lock and license plate light wiring fault
License plate lights blow out and flicker; hatch lock clicks repeatedly without user input. Wiring harness covered with rubber boot causes intermittent contact; moving boot causes lock clicking and light flickering. Hatch lock intermittently fails to unlock.
When: No specific mileage given
Symptoms owners cite: license plate lights flicker and blow out; hatch lock clicks repeatedly; hatch lock locks but won't unlock; problem worsens when harness is moved
Engine stalling due to ignition or electrical malfunction
Engine stalls without warning while driving, sometimes at low speed and sometimes on freeway at highway speeds. Vehicle loses all power including power steering and brake assist, creating hazard. Subsequent restart may be delayed or require key cycling.
When: Various mileage and conditions; 15 mph, 30 mph, 55 mph, 60 mph, 65 mph observed
Symptoms owners cite: engine dies with no warning; loss of power steering; loss of brake assist; difficulty restarting; warning lights illuminate; loss of all electrical power reported
Repairs/costs cited: Ignition switch replacement most common repair; towing required
Ignition key stuck or won't turn
Ignition key fails to turn in switch, preventing engine start. Tumbler mechanism portion of ignition switch fails. In one case, key could not be removed from ignition after failed start attempt.
When: 27k (first failure), 71k (second failure); 74k observed in another case
Symptoms owners cite: key won't turn in ignition; tumbler mechanism fails; key stuck and won't come out; battery warning light on
Repairs/costs cited: Ignition switch replacement; one owner notes 'electrical portion' failure; $389–$500+ cost
Recalls/TSBs owners mention: First replacement covered under warranty in one case
Intermittent electrical gremlins affecting multiple systems
Cluster of intermittent electrical faults affecting window switches, climate control, transmission, and various lights. Burning odors reported in some cases. Root cause not identified in several narratives; some attributed to corroded voltage regulator.
When: 35k–102k mileage; varies by system affected
Symptoms owners cite: window motor switch fails; HVAC temperature control motor fails; rear locking assembly inoperative; burning odor present; multiple warning lights; window control intermittent
Repairs/costs cited: Window motor switch replacement, HVAC temperature control motor replacement, rear locking assembly replacement; some vehicles not repaired
Recalls/TSBs owners mention: Dealer proposed discount on new vehicle in one case
Electronic Control Module (ECM) failure
ECM failures cause brake system to lose effectiveness (pedal must be pressed to floor with little effect) and airbag sensor short. Narrative suggests similarity to 2014 Malibu recall for ECM failure.
When: No specific mileage given
Symptoms owners cite: brakes lose effectiveness; brake pedal must go to floor; airbag sensor failure; multiple warning lights
Repairs/costs cited: Brake system repair performed, but owner uncertain if needed beyond ECM fix
Synthesized from 62 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 6 most recent
Airbag light came on and had a bad impact sensor. Had to replace to pass inspection. SUV only 6 years old. Stability control light comes on every time I hit a bump in the road. *tr
Tl* the contact owns a 2008 Chevrolet trailblazer. The contact stated that the vehicle failed to start. The failure occurred on numerous occasions. The vehicle was taken to an independent mechanic where it was diagnosed that the ignition switch needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was 61,553. Updated 02/24/15*lj…
75k on 2008 trailblazer.... Instrument panel lights and audio display work intermittently. Seems to be connected to cold temps? They are off at startup but as SUV is driven and warms up... The audio display appears. The radio/cd player work even when the display is off. Just started happening this fall (2016). Also.. The low tire pressure light comes on only in cold temps but goes out after…
While entering a gas station the vehicle in front of me slammed on the brakes. This was done because the gm at the pump had it's backup lights on and wasn't even backing up. What's really disturbing is the fact people will start ta ignore these in dark or rainy parking lots and potentially get run over. Shouldn't backup lights only be used for backing up? This looks like a problem with the whole…
It bag for front driver light is on do not know why? There is some kind of electrical short and I've had it checked by two companies cannot find it I've had new battery, new alternator and still car stops working I get car jumped and can put key in ignition to try to start car and when I shut car off too soon or why I try to start car it's not working and then I cannot get key out of the…
Had electrical trouble with your 2008 Chevrolet Trailblazer?
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 electrical problem on the 2008 Chevrolet Trailblazer?
It's a meaningful issue. 62 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Across the 54 complaints that reported odometer mileage, most electrical failures cluster between 61,553 and 102,000 miles, with the median around 84,883. A quarter of owners report trouble before 61,553; a quarter make it past 102,000. 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 $850 for electrical 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 electrical?
No active recalls currently cover electrical 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/Trailblazer.
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.