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 1680 (BODY CONTROL 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 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) List
| DTC | Diagnostic Procedure | Module(s) |
|---|---|---|
| B0005 | BCM | |
| B0285 | DTC B0285 in Stationary Windows | BCM |
| B0286 | DTC B0286 in Stationary Windows | BCM |
| B0936 | DTC B0936 in Engine Cooling | BCM |
| B1000 | DTC B1000 | SDM, BCM |
| B1001 | DTC B1001 | SDM, BCM |
| B1327 | DTC B1327 in Engine Electrical | BCM |
| B1328 | DTC B1328 in Engine Electrical | BCM |
| B1372 | DTC B1372 | BCM |
| B1382 | DTC B1382 | BCM |
| B1482 | DTC B1482 in Lighting Systems | BCM |
| B2532 | DTC B2532 in Lighting Systems | BCM |
| B2533 | DTC B2533 in Lighting Systems | BCM |
| B2600 | DTC B2600 in Lighting Systems | BCM |
| B2602 | DTC B2602 in Lighting Systems | BCM |
| B2603 | DTC B2603 in Lighting Systems | BCM |
| B2622 | DTC B2622 in Lighting Systems | BCM |
| B2623 | DTC B2623 in Lighting Systems | BCM |
| B2627 | DTC B2627 in Lighting Systems | BCM |
| B2628 | DTC B2628 in Lighting Systems | BCM |
| B2662 | DTC B2662 in Lighting Systems | BCM |
| B2707 | DTC B2707 in Shift Lock Control | BCM |
| B2708 | DTC B2708 in Shift Lock Control | BCM |
| B2743 | DTC B2743 in Lighting Systems | BCM |
| B2752 | DTC B2752 in Horns | BCM |
| B2753 | DTC B2753 in Horns | BCM |
| B2947 | DTC B2947 in Theft Deterrent | BCM |
| B2948 | DTC B2948 in Theft Deterrent | BCM |
| B2957 | DTC B2957 in Theft Deterrent | BCM |
| B2958 | DTC B2958 in Theft Deterrent | BCM |
| B2960 | DTC B2960 in Theft Deterrent | BCM |
| B2965 | DTC B2965 in Instrument Panel, Gages, and Console | BCM |
| B3031 | DTC B3031 in Theft Deterrent | BCM |
| B3033 | DTC B3033 in Theft Deterrent | BCM |
| B3109 | DTC B3109 in Keyless Entry | BCM |
| B3538 | DTC B3538 in Instrument Panel, Gages, and Console | BCM |
| B3702 | DTC B3702 in Wiper/Washer Systems | BCM |
| B3703 | DTC B3703 in Wiper/Washer Systems | BCM |
| B3708 | DTC B3708 in Wiper/Washer Systems | BCM |
| B3713 | DTC B3713 in Wiper/Washer Systems | BCM |
| B3717 | DTC B3715, B3716, B3717, B3718, or B3719 in Wiper/Washer Systems | BCM |
| B3718 | DTC B3715, B3716, B3717, B3718, or B3719 in Wiper/Washer Systems | BCM |
| B3722 | DTC B3722 in Wiper/Washer Systems |
BCM |
| B3723 | DTC B3723 in Wiper/Washer Systems | BCM |
| B3787 | DTC B3787 in HVAC Systems - Manual | BCM |
| B3788 | DTC B3788 in HVAC Systems - Manual | BCM |
| C0267 | BCM | |
| U1000 | DTC U1000 in Data Link Communications | BCM, EPS, SDM, VCIM |
| U1048 | DTC U1001-U1254 in Data Link Communications | BCM |
| U1088 | DTC U1001-U1254 in Data Link Communications | BCM, VCIM |
| U1096 | DTC U1001-U1254 in Data Link Communications | BCM, EPS, SDM |
| U1151 | DTC U1001-U1254 in Data Link Communications | BCM |
| U1300 | DTC U1300, U1301, or U1305 in Data Link Communications | BCM, EPS, SDM, VCIM |
| U1301 | DTC U1300, U1301, or U1305 in Data Link Communications | BCM, EPS, SDM, VCIM |
| U2104 | DTC U2104 in Data Link Communications | BCM, ECM |
| U2105 | DTC U2105-U2108 in Data Link Communications | BCM, EBTCM, TCM |
| U2106 | DTC U2105-U2108 in Data Link Communications | BCM, EBTCM, ECM |
| U2108 | DTC U2105-U2108 in Data Link Communications | BCM, ECM, TCM |
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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.