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 959 (ANTILOCK BRAKE SYSTEM AND TRACTION CONTROL SYSTEM)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 959 (Antilock Brake System And Traction Control System)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 959 (Antilock Brake System And Traction Control System)
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Antilock Brake System
- Diagnostic System Check - ABS
- Scan Tool Output Controls (8600 GVW or Under Except PHT)
- Scan Tool Output Controls (Over 8600 GVW or PHT)
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC C0035 or C0040: Front Wheel Speed Sensor Circuit
- DTC C0055: Rear Wheel Speed Sensor Circuit
- DTC C0110: Pump Motor Circuit
- DTC C0161: Traction Control System (TCS) Brake Switch
- DTC C0201: Antilock Brake System (ABS) Enable Relay Contact Circuit
- DTC C0221, C0222, C0223, C0224, C0225, C0226, C0227: Front Wheel Speed Sensor Circuit
- DTC C0228: Antilock Brake System (ABS) Channel in Release Too Long
- DTC C0229: Drop Out of Front Wheel Speed Signals
- DTC C0235, C0236, C0237 or P0609: Rear Wheel Speed Sensor Circuit
- DTC C0238: Wheel Speed Mismatch
- DTC C0241, C0242, C0243, C0244, C0245, C0246, C0247, C0248, C0249, C0250, C0251, C0252, C0253, C0254 (8600 GVW or under except PHT): EBCM Malfunction
- DTC C0241, C0242, C0243, C0244, C0245, C0246, C0247, C0248, C0249, C0250, C0251, C0252, C0253, C0254 (Over 8600 GVW or PHT): EBCM Malfunction
- DTC C0265 or C0266: EBCM Relay Circuit
- DTC C0267 or C0268: Pump Motor Circuit
- DTC C0269 or C0274: Excessive Dump/Isolation Time
- DTC C0271, C0272, C0273, C0284: EBCM Malfunction
- DTC C0279: Powertrain Configuration Not Valid
- DTC C0281: Brake Switch Circuit
- DTC C0283: Traction Switch Shorted to Ground
- DTC C0287, P1644, or P1689: Delivered Torque Circuit
- DTC C0290 or C0292: Lost Communications With PCM
- DTC C0291: Lost Communications With BCM
- DTC C0297: Powertrain Configuration Data Not Received
- DTC C0298 or P0856: Requested Torque Signal Circuit
- DTC C0550: ECU Malfunction
- Symptoms - Antilock Brake System
- ABS Indicator Always On
- ABS Indicator Inoperative
- Traction Off Indicator Always On
- Traction Off Indicator Inoperative
- Repair Instructions
- Description and Operation
- ABS Description and Operation (8600 GVW or less except PHT)
- ABS Description and Operation (Over 8600 GVW or PHT)
- Special Tools and Equipment
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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.