Code
C0310
HUMMER
C — Chassis
Right rear wheel speed sensor circuit malfunction
AI status
Completed
Completed
100%
Causes
- Damaged or shorted sensor wiring harness (open, short to ground or battery, chafing)
- Corroded, loose, or contaminated sensor connector/terminal
- Failed wheel speed sensor (magnetic/passive or active/Hall sensor)
- Damaged, missing or contaminated tone/reluctor ring (missing teeth, heavy corrosion, debris)
- Faulty ABS control module or poor module connector/pin
- Wheel bearing damage that affects sensor air gap or tone ring position
Symptoms
- ABS warning lamp and/or traction/stability control warning lamp illuminated
- Loss or intermittent operation of ABS, traction control, or stability control functions
- Inconsistent or zero wheel speed reading for right rear on a scan tool
- Possible pulsation/braking anomalies during ABS events
- Diagnostic trouble codes stored for wheel speed sensor circuit
What to check
- Read and record all stored codes and freeze frame data with a capable scan tool
- Visual inspection of right rear wheel area: sensor, wiring, connector, and tone ring
- Check for corrosion, bent pins, water intrusion, or damaged insulation at connectors
- Check live wheel speed data on a scan tool while rotating wheels (on lift) or during road test
- Back-probe sensor connector to verify reference voltage, signal waveform, and ground
- Perform wiggle test on wiring while monitoring live data or continuity to reproduce intermittent faults
Signal parameters
- Passive (magnetic) sensor typical resistance: roughly 500–2,000 ohms (varies by vehicle) — produces AC voltage when rotated
- Active (Hall or VR with electronics) sensor typical: 5V reference and ground; output a square wave 0–5V (or 0–12V on some systems) proportional to speed
- AC amplitude for passive sensors typically increases with speed (e.g., several hundred millivolts to a few volts AC)
- Frequency of pulses increases with wheel speed (use oscilloscope or scan tool speed reading to verify)
- Consult the specific vehicle service manual for exact resistance, reference voltage, and waveform expected for the HUMMER model
Diagnostic algorithm
- Retrieve and record all ABS/traction/stability codes and freeze frame data using a scan tool.
- Visually inspect the right rear sensor, wiring harness, and connector for damage, contamination, or looseness. Repair obvious damage.
- With ignition on (engine off), back-probe the sensor connector: verify reference voltage (if active sensor), ground continuity, and check for short to battery or ground.
- If passive sensor: disconnect and measure sensor resistance at the sensor leads; compare to spec. Spin the wheel and check AC output with meter or scope.
- If active sensor: with connector connected, monitor output signal on scope or multimeter while spinning the wheel (lifted) and verify a clean square or pulse waveform and correct voltage levels.
- Use scan tool live data to compare right rear wheel speed reading to other wheels. Perform a road test if safe to confirm intermittent issues.
- Perform wiggle test on wiring harness and connectors while monitoring signal to identify intermittent opens/shorts.
- Inspect tone/reluctor ring for missing teeth, heavy rust, or debris. Check sensor air gap and alignment per service manual.
- If wiring or connector fault found, repair or replace damaged sections and restore proper routing and protection.
- If sensor fails bench or on-vehicle signal tests, replace sensor. If sensor and wiring check good but fault persists, check continuity to the ABS control module and inspect/replace ABS module connector or consider module testing.
- Clear codes and perform test drive to confirm repair and that no reoccurring codes return.
Likely causes
- Corroded or loose connector at the right rear wheel speed sensor
- Broken or chafed wiring leading to an open or intermittent connection
- Failed wheel speed sensor (most common)
- Physical damage to tone/reluctor ring or excessive debris buildup
Fault status
Status
C0310 — Right rear wheel speed sensor circuit malfunction (open/short/intermittent signal).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Repair manuals
Manual library for HUMMER
138
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