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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 772 (Anti-Lock Brake System) >> Diagnostic Information & Procedures >> DTC 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 >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Operating the vehicle on extremely rough terrain can set DTC C0223, C0227 or C0229 even if the system is functioning normally.

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to TESTING FOR INTERMITTENT & POOR CONNECTIONS , CONNECTOR REPAIRS , or TESTING FOR ELECTRICAL INTERMITTENTS .

If the customer's concern is that the ABS indicator is on only during humid conditions such as rain, snow or vehicle wash, thoroughly inspect the wheel speed sensor circuits for signs of water intrusion. Use the following procedure in order to help isolate the problem area:

  1. Spray the suspected area with a 5 percent salt water solution.
  2. Drive the vehicle at a speed greater than 19 km/h (12 mph) for at least 30 seconds. Repair or replace the suspect harness if the DTC sets.
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