Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 939 (ANTI-LOCK BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC TROUBLE CODE (DTC) LIST
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Diagnostic Trouble Code (DTC) List
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Diagnostic Trouble Code (DTC) List
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE (DTC) DEFINITION
| DTC | Description |
|---|---|
| C0221 | RF Wheel Speed Sensor Circuit Open |
| C0222 | RF Wheel Speed Signal Missing |
| C0223 | RF Wheel Speed Signal Erratic |
| C0225 | LF Wheel Speed Sensor Circuit Open |
| C0226 | LF Wheel Speed Signal Missing |
| C0227 | LF Wheel Speed Signal Erratic |
| C0229 | Drop Out Of Front Wheel Speed Signals |
| C0235 | Rear Wheel Speed Signal Circuit Open |
| C0236 | Rear Wheel Speed Signal Circuit Missing |
| C0237 | Rear Wheel Speed Signal Erratic |
| C0238 | Wheel Speed Mismatch |
| C0241 | EBCM Control Valve Circuit |
| C0245 | Wheel Speed Sensor Frequency Error |
| C0254 | EBCM Control Valve Circuit |
| C0265 | EBCM Relay |
| C0266 | EBCM Relay Circuit |
| C0267 | Pump Motor Circuit Open/Shorted |
| C0268 | Pump Motor Circuit Open/Shorted |
| C0269 | Excessive Dump/Isolation Time |
| C0271 | EBCM Malfunction |
| C0272 | EBCM Malfunction |
| C0273 | EBCM Malfunction |
| C0274 | Excessive Dump/Isolation Time |
| C0279 | Powertrain Configuration Not Valid |
| C0281 | Brake Switch Circuit |
| C0283 | Traction Switch Shorted To Ground (W/NW7) |
| C0284 | EBCM Malfunction |
| C0287 | Delivered Torque Circuit |
| C0290 | Lost Communications With PCM |
| C0292 | Lost Communications With PCM |
| C0297 | Powertrain Configuration Data Not Received |
| C0298 | Powertrain Indicated Traction Control Malfunction |
| P1504 | Vehicle Speed Output Circuit |
| P1571 | TCS PWM Circuit No Frequency |
| P1644 | P1644: Delivered Torque Output Circuit |
| P1689 | Traction Control Delivered Torque Circuit |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.