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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2 (ANTI-LOCK BRAKE SYSTEM)
2002 Chevrolet Avalanche 2500, RWD
Section 2 (Anti-Lock Brake System)
2002 Chevrolet Avalanche 2500, RWDSECTION Section 2 (Anti-Lock Brake System)
WARNING: This page does not describe the selected car, but rather 54 other vehicles, including the 1999 Oldsmobile Bravada, 1999 GMC Yukon, 1999 GMC Suburban, 1999 GMC Sonoma, and 1999 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
- Model Identification
- Description
- Operation
- Bleeding Brake System
- Diagnosis & Testing
- Symptom Tests
- Diagnostic Tests
- Notes
- DTC C0221: Right Front Wheel Speed Sensor Circuit Open
- DTC C0222: Right Front Wheel Speed Sensor Signal Missing
- DTC C0223: Right Front Wheel Speed Sensor Signal Erratic
- DTC C0225: Left Front Wheel Speed Sensor Circuit Open
- DTC C0226: Left Front Wheel Speed Sensor Signal Missing
- DTC C0227: Left Front Wheel Speed Sensor Signal Erratic
- DTC C0229: Drop Out Of Front Wheel Speed Sensor Signals
- DTC C0235: Rear Speed Sensor Signal Circuit Open Or Grounded (Gasoline Engines)
- DTC C0235: Rear Speed Sensor Signal Circuit Open Or Grounded (Diesel Engines)
- DTC C0236: Rear Speed Sensor Signal Missing (Gasoline Engines)
- DTC C0236: Rear Speed Sensor Signal Missing (Diesel Engines)
- DTC C0237: Rear Speed Sensor Signal Erratic (Gasoline Engines)
- DTC C0237: Rear Speed Sensor Signal Erratic (Diesel Engines)
- DTC C0238: Wheel Speed Signal Malfunction
- DTC C0241: Right Front Isolation Solenoid Circuit Open
- DTC C0242: Right Front Dump Solenoid Circuit Open
- DTC C0243: Right Front Isolation Solenoid Circuit Shorted
- DTC C0244: Right Front Dump Solenoid Circuit Shorted
- DTC C0245: Left Front Isolation Solenoid Circuit Open
- DTC C0246: Left Front Dump Solenoid Circuit Open
- DTC C0247: Left Front Isolation Solenoid Circuit Shorted
- DTC C0248: Left Front Dump Solenoid Circuit Shorted
- DTC C0251: Rear Isolation Solenoid Circuit Shorted
- DTC C0252: Rear Dump Solenoid Circuit Open
- DTC C0253: Rear Isolation Solenoid Circuit Shorted (Except "L" & "M" Series)
- DTC C0254: Rear Dump Solenoid Circuit Shorted
- DTC C0265: Pump Motor Relay Circuit Open
- DTC C0266: Pump Motor Relay Circuit Shorted
- DTC C0267: Pump Motor Circuit Open (Except "L" & "M" Series)
- DTC C0267: Pump Motor Circuit Open ("L" & "M" Series)
- DTC C0268: Pump Motor Locked Or Pump Motor Circuit Shorted (Except "L" & "M" Series)
- DTC C0268: Pump Motor Locked Or Circuit Shorted ("L" & "M" Series)
- DTC C0269 Or C0274: Excessive Dump/Isolation Time
- DTC C0271, C0272 & C0273: EBCM Internal Fault
- DTC C0281: Stoplight Switch Always Closed Or Shorted
- DTC C0286: Anti-Lock Indicator Light Circuit Shorted To Battery Voltage
- DTC C0288: Brake Warning Light Circuit Shorted To Battery Voltage
- Removal & Installation
- Torque Specifications
- Wiring Diagrams
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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.