Code
C0226
HUMMER
C — Chassis
Right Rear Wheel Speed Sensor Circuit
Views:
UK: 16
EN: 50
RU: 15
AI status
Completed
Completed
100%
Causes
- Damaged or failed right rear wheel speed sensor
- Broken, pinched, chafed or corroded wiring between sensor and ABS module
- Poor or corroded sensor connector or terminal
- Short to voltage or short to ground in sensor circuit
- Damaged or missing tone ring (reluctor) or excessive air gap
- Contaminated sensor (metal debris, excessive grease) or sensor alignment issue
Symptoms
- ABS warning lamp illuminated
- Traction/stability control warning or disabled
- ABS may activate unexpectedly or not activate when needed
- Possible brake system behavior changes under heavy braking
- Reduced or disabled traction/stability control functions
- Possible diagnostic trouble codes stored for other wheel sensors
What to check
- Scan ABS module for C0226 and any related codes; record freeze frame/live data
- Visually inspect right rear wheel sensor, tone ring, connector, and wiring harness
- Check connector for corrosion, bent pins, water intrusion, or loose fit
- Wiggle wiring and connector while monitoring live data or continuity for intermittent faults
- Measure sensor resistance (for passive sensors) and compare to specification
- Measure AC voltage or waveform from sensor while wheel is rotated
Signal parameters
- Passive (variable reluctance) sensor: DC resistance varies by model (commonly a few hundred to a few thousand ohms) — consult vehicle spec
- Passive sensor output: AC voltage increases with wheel speed; low speeds may produce small millivolt-level AC, higher speeds produce volts
- Active (hall-effect/active) sensor: requires supply (typically 5V or battery reference) and provides a square/pulse signal 0–5V (varies by system)
- Pulse frequency increases with wheel speed; frequency and tooth count vary by vehicle (e.g., tens to thousands of Hz depending on speed)
- Exact resistance, supply voltage, and waveform specifications must be checked in the vehicle service manual
Diagnostic algorithm
- Read and record all ABS codes and freeze frame data using a capable scan tool. Note whether the code is current or historic.
- Visually inspect the right rear wheel area: sensor, tone ring, mounting, and wiring for obvious damage, contamination, or missing components.
- Disconnect the right rear sensor connector and inspect pins for corrosion, bent pins, or water intrusion. Re-seat connector and check for improved contact.
- If sensor is passive, measure DC resistance across the sensor terminals and compare to specification. Replace if open or out-of-spec.
- Rotate the wheel (lift vehicle safely on jack stands) and measure AC output of a passive sensor with a multimeter or scope; verify waveform amplitude increases with speed.
- For active sensors, with ignition on, verify reference supply to the sensor (typically 5V or battery reference) and check output waveform while rotating the wheel.
- Perform a continuity and resistance check from the sensor connector back to the ABS module pin to rule out wiring opens or high resistance. Check for shorts to ground and battery supply.
- Inspect tone ring carefully for missing/bent teeth, heavy rust or ferrous debris, and confirm correct air gap between sensor tip and tone ring per spec.
- If wiring or connector is damaged, repair with proper automotive splice methods and corrosion protection. If sensor or tone ring is damaged, replace the faulty component.
- After repairs, clear codes, perform a road test while monitoring wheel speed sensor live data, and confirm C0226 does not return.
Likely causes
- Corroded connector at the wheel leading to intermittent connection
- Wire damaged at suspension pivot point or undercarriage rub-through
- Failed passive or active wheel speed sensor
- Broken or damaged tone ring on hub/axle causing no/erratic signal
Fault status
Status
Right rear wheel speed sensor circuit fault detected by ABS control. This can disable ABS/traction control and should be diagnosed. Inspect sensor, wiring, connector, and tone ring; repair or replace as required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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