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 MANUALSGMC1999SAVANA SPECIAL 7.4 JREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSTIC TESTSDTC C0221: RIGHT FRONT WHEEL SPEED SENSOR CIRCUIT OPENDIAGNOSIS
1999 GMC Savana Special 7.4 J
DTC C0221: Right Front Wheel Speed Sensor Circuit Open: Diagnosis
1999 GMC Savana Special 7.4 JSECTION Diagnosis
- Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
- Turn ignition off. Disconnect 4-pin EBCM harness connector. Check resistance between 4-pin harness connector terminals "C" and "E". See WSS TEMPERATURE-VS-SENSOR RESISTANCE table. If resistance is as specified, go to step 5) . If not, go to next step.
- Disconnect right WSS harness connector. Using a fused jumper wire, jumper sensor harness connector terminals "A" and "B". Using DVOM, check resistance between 4-pin EBCM harness connector terminals "C" and "E". If resistance is 0-2 ohms, go to next step. If not, go to step 10) .
- Check resistance between right WSS harness connector terminals "A" and "B". See WSS TEMPERATURE-VS-SENSOR RESISTANCE table. If resistance is as specified, go to step 7) . If not, go to step 11) .
- Inspect 4-pin EBCM harness connector for signs of damage or corrosion. If damage is present, go to step 8) . If no signs of damage are present, go to next step.
- Reconnect all harness connectors. Test drive vehicle at speed greater than 15 MPH. If DTC C0221 sets, go to step 9) . If not, go to next step.
- Malfunction is intermittent. Check all connectors and harnesses for damage which may result in high resistance when components are connected. See DIAGNOSTIC AIDS .
- Repair 4-pin EBCM harness connector.
- Replace EBCM.
- Repair open or high resistance in wheel speed sensor circuits between sensor and EBCM.
- Replace wheel speed sensor.
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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.