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 18 (BODY CONTROL MODULES)SELF-DIAGNOSTIC SYSTEMANTI-LOCK BRAKE SYSTEM DIAGNOSTIC SYSTEM CHECK
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Anti-Lock Brake System Diagnostic System Check
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Anti-Lock Brake System Diagnostic System Check
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana Special, 2001 GMC Savana Camper Special, and 2001 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC), located below steering column. Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST A: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Attempt to establish communications with 4-WAL 3 Sensor and Powertrain Control Module (PCM). If communications with specified modules is successful, go to next step. If unable to establish communications with specified modules, go to TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Using scan tool, request DTCs from 4-WAL 3 Sensor and PCM. If DTCs are retrieved, go to next step. If no DTCs are retrieved, repair by symptom. See appropriate ANTI-LOCK BRAKES article in BRAKES.
- If scan tool retrieves DTCs which begin with "U", see TEST B: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS. If scan tool retrieves other DTCs, go to next step.
- If scan tool retrieves DTCs P0500, P0502, P0503, P0562, P0563, P0601-P0607, P1381, P1621, P1627 or P1683, see appropriate SELF DIAGNOSTICS article in ENGINE PERFORMANCE. If scan tool displays other DTCs, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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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.