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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 4.3 W, STANDARDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSTIC TESTSDTC C0229: DROP OUT OF FRONT WHEEL SPEED SENSOR SIGNALSDIAGNOSIS
1999 GMC Forward Control 4.3 W, Standard

DTC C0229: Drop Out Of Front Wheel Speed Sensor Signals: Diagnosis

1999 GMC Forward Control 4.3 W, StandardSECTION Diagnosis
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Disconnect 4-pin EBCM harness connector. Inspect harness connector and terminals for damage or corrosion. If harness or terminal is damaged or corroded, go to step 4)  . If harness and terminal are okay, go to next step.
  3. Reconnect harness connector. Clear DTC. Road test vehicle at speeds greater than 15 MPH. Retrieve DTCs. If DTC C0229 resets, go to step 5)  . If DTC does not reset, go to step 6)  .
  4. Make necessary repairs to harness connector or terminals.
  5. Replace EBCM.
  6. Malfunction is intermittent. Inspect all connectors and harnesses for damage which may result in high resistance when all components are connected. See DIAGNOSTIC AIDS .
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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.