Code
C0271
Generic
C — Chassis
Right rear wheel speed sensor circuit — range/performance
Views:
UK: 2
EN: 2
RU: 1
AI status
Completed
Completed
100%
Causes
- Failed or intermittent right rear wheel speed sensor
- Damaged wiring harness or broken wires to the sensor (chassis flex point)
- Corroded or loose sensor connector or poor ground
- Damaged or missing tone/reluctor ring (missing/bent teeth)
- Excessive sensor-to-reluctor air gap or misalignment
- Metal debris or corrosion contaminating sensor or tone ring
Symptoms
- ABS warning light and/or traction/stability control warning on dash
- Intermittent or constant ABS/ESC intervention or disabled traction control
- Speedometer/odometer glitches (vehicle-dependent)
- Diagnostic trouble code C0271 stored and possibly active
- Possible inconsistent braking feel during ABS events
- Fault may be intermittent and occur with wheel motion or steering
What to check
- Read DTC and freeze-frame/snapshot data with a scan tool; note when fault sets
- Visually inspect right rear sensor, connector, and wiring for damage, corrosion, or debris
- Compare live wheel speed readings for all four wheels at low speed using a scan tool
- Wiggle harness and connector with ignition on & monitor live data for intermittent changes
- Measure supply voltage and ground at the sensor connector (if active sensor) with key on
- Measure sensor resistance (if passive) and check for short to ground/12V
Signal parameters
- Passive (variable-reluctance) sensor: DC resistance typically hundreds to low thousands of ohms (vehicle-specific); produces AC voltage whose amplitude increases with wheel speed
- Active (Hall/type) sensor: requires reference supply (commonly 5V or 12V) and ground; produces a square/pulse signal (0–5V or 0–12V depending on system) with frequency proportional to wheel speed
- Typical expected behavior: a clean, regular frequency/voltage waveform while wheel is spun; amplitude and frequency should be similar to other wheels at same speed
- Tone ring tooth count and pulse frequency are vehicle-specific — use manufacturer spec for exact values
Diagnostic algorithm
- Connect a professional scan tool. Record DTC PIDs/Freeze Frame and clear codes. Test drive to attempt to re-create the fault and capture live data.
- Visually inspect right rear hub area: sensor condition, mounting, connector sealing, tone ring integrity and cleanliness.
- With ignition on, probe sensor connector: confirm reference voltage (active sensors), ground continuity, and no short to battery or ground. Repair any missing reference or ground.
- Perform a wiggle test: with scan tool monitoring wheel speed PID, flex harness near suspension and connector to detect intermittent faults.
- For passive sensors: remove connector and measure DC resistance of the sensor. Then spin the wheel (or jack and spin) and measure AC voltage; look for rising amplitude with speed.
- For active sensors: verify supply voltage present, then check signal output with scope or high-speed DMM while spinning wheel; verify square/pulse waveform and frequency.
- Compare the right rear sensor signal to an opposite wheel (left rear or front) to confirm expected behavior.
- If wiring is open/short/intermittent: repair or replace the damaged section, secure harness away from pinch points and re-route as needed.
- If sensor output is absent or out of range with correct wiring, replace the sensor. If tone ring is damaged/corroded/missing teeth, repair or replace tone ring/hub assembly.
- After repairs, erase codes and perform a road test to confirm the fault does not return and wheel speed signals are normal.
Likely causes
- Corroded/loose connector at right rear sensor
- Broken or pinched wire in harness at suspension pivot
- Failed wheel speed sensor (common failure item)
- Damaged or dirty tone/reluctor ring (missing teeth or heavy rust)
- Intermittent open/short under load or when steering is turned
Fault status
Status
Right rear wheel speed sensor circuit — range/performance fault detected (C0271).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
C0271
HUMMER
C — Chassis
EBCM Malfunction
Views:
UK: 16
EN: 22
RU: 12
AI status
Completed
Completed
100%
Causes
- Failed or intermittent right rear wheel speed sensor
- Damaged wiring harness or broken wires to the sensor (chassis flex point)
- Corroded or loose sensor connector or poor ground
- Damaged or missing tone/reluctor ring (missing/bent teeth)
- Excessive sensor-to-reluctor air gap or misalignment
- Metal debris or corrosion contaminating sensor or tone ring
Symptoms
- ABS warning light and/or traction/stability control warning on dash
- Intermittent or constant ABS/ESC intervention or disabled traction control
- Speedometer/odometer glitches (vehicle-dependent)
- Diagnostic trouble code C0271 stored and possibly active
- Possible inconsistent braking feel during ABS events
- Fault may be intermittent and occur with wheel motion or steering
What to check
- Read DTC and freeze-frame/snapshot data with a scan tool; note when fault sets
- Visually inspect right rear sensor, connector, and wiring for damage, corrosion, or debris
- Compare live wheel speed readings for all four wheels at low speed using a scan tool
- Wiggle harness and connector with ignition on & monitor live data for intermittent changes
- Measure supply voltage and ground at the sensor connector (if active sensor) with key on
- Measure sensor resistance (if passive) and check for short to ground/12V
Signal parameters
- Passive (variable-reluctance) sensor: DC resistance typically hundreds to low thousands of ohms (vehicle-specific); produces AC voltage whose amplitude increases with wheel speed
- Active (Hall/type) sensor: requires reference supply (commonly 5V or 12V) and ground; produces a square/pulse signal (0–5V or 0–12V depending on system) with frequency proportional to wheel speed
- Typical expected behavior: a clean, regular frequency/voltage waveform while wheel is spun; amplitude and frequency should be similar to other wheels at same speed
- Tone ring tooth count and pulse frequency are vehicle-specific — use manufacturer spec for exact values
Diagnostic algorithm
- Connect a professional scan tool. Record DTC PIDs/Freeze Frame and clear codes. Test drive to attempt to re-create the fault and capture live data.
- Visually inspect right rear hub area: sensor condition, mounting, connector sealing, tone ring integrity and cleanliness.
- With ignition on, probe sensor connector: confirm reference voltage (active sensors), ground continuity, and no short to battery or ground. Repair any missing reference or ground.
- Perform a wiggle test: with scan tool monitoring wheel speed PID, flex harness near suspension and connector to detect intermittent faults.
- For passive sensors: remove connector and measure DC resistance of the sensor. Then spin the wheel (or jack and spin) and measure AC voltage; look for rising amplitude with speed.
- For active sensors: verify supply voltage present, then check signal output with scope or high-speed DMM while spinning wheel; verify square/pulse waveform and frequency.
- Compare the right rear sensor signal to an opposite wheel (left rear or front) to confirm expected behavior.
- If wiring is open/short/intermittent: repair or replace the damaged section, secure harness away from pinch points and re-route as needed.
- If sensor output is absent or out of range with correct wiring, replace the sensor. If tone ring is damaged/corroded/missing teeth, repair or replace tone ring/hub assembly.
- After repairs, erase codes and perform a road test to confirm the fault does not return and wheel speed signals are normal.
Likely causes
- Corroded/loose connector at right rear sensor
- Broken or pinched wire in harness at suspension pivot
- Failed wheel speed sensor (common failure item)
- Damaged or dirty tone/reluctor ring (missing teeth or heavy rust)
- Intermittent open/short under load or when steering is turned
Fault status
Status
Right rear wheel speed sensor circuit — range/performance fault detected (C0271).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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