FixChevrolet Trailblazer Check Engine Light On — What It Usually Means, and What It Costs
Across all vehicles, the most common cause of a check engine light is Spark Plugs (17.4%). On the Chevrolet Trailblazer it is Thermostat (19.9%), so the order of suspects is different for this vehicle. The table below shows each fix for this vehicle next to the all-vehicle share, with what it costs on the Chevrolet Trailblazer.
What it actually turns out to be on the Chevrolet Trailblazer
| The fix involved | Chevrolet Trailblazer* | All vehicles* | Typical cost† |
|---|---|---|---|
| Thermostat | 19.9% | 6.1% | $181 – $329 |
| Ignition Coil | 18% | 10.7% | $210 – $375 |
| Spark Plugs | 16.3% | 17.4% | $211 – $431 |
| EVAP Component | 12.1% | 9.8% | $154 – $333 |
| Sensor | 7.4% | 14.2% | $178 – $385 |
| Oxygen Sensor | 7.3% | 11.7% | $180 – $349 |
| Fuel Cap | 6.5% | 3.7% | $34 – $125 |
| VVT Solenoid | 6.1% | 2% | $211 – $379 |
| Throttle Body | 4.2% | 2.9% | $309 – $605 |
| Other, rarer causes | smaller shares | — | varies |
*Share of visits whose repair involved this part, among visits for this complaint that ended in a parts repair. Combined
repairs count toward each part involved, so shares overlap and don't add up to 100%.
†Middle half of real Chevrolet Trailblazer invoices (25th–75th percentile) when this was the only fix, parts + labor; rows marked "all vehicles" use all vehicle types.
Real repair reports
Recent, paid Chevrolet Trailblazer visits for this complaint — the words as the owner said them, and what it turned out to be.
Chevrolet Trailblazer owners said
“Mil back on / rescan / fault codes”
“Diagnose check engine light”
“Diagnosis check engine light”
“Flashing Check engine light on”
More on this problem and this vehicle
- Check Engine Light On: all vehicles — how to tell the causes apart, and what each fix usually costs
Take this to the shop
The FixDozer Diagnosis Brief for this complaint puts the all-vehicle odds on one printable sheet. Bring it with this page: the table above shows how the Chevrolet Trailblazer differs.
Download the Diagnosis Brief (PDF, all vehicles)View it online · Narrow it down step by step
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