C0497

Code

Generic C — Chassis

Right Rear Wheel Speed Sensor Circuit Malfunction

Brand: Generic

Type: C — Chassis

Views: UK: 10 EN: 21 RU: 14

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or failed right rear wheel speed sensor (VR or Hall type)
Broken, frayed or pinched wiring harness to the sensor
Corroded or loose sensor connector or pins
Damaged or missing tone/ring reluctor on the wheel or axle
Short to battery or ground in the sensor circuit
Poor chassis or sensor ground

Symptoms

ABS, ESC or traction-control warning lamp illuminated
Possible illumination of traction/stability warning and disabled ABS/TC functionality
Loss of right rear wheel speed data in scan tool live data
Inconsistent or fluctuating wheel speed reading for right rear wheel when spinning wheel
ABS/ESC interventions may be abnormal (unwanted activation or disabled)
Possible brake or vehicle stability symptoms under certain conditions

What to check

Scan for active and pending codes and read freeze frame data with an OEM-level scan tool
Inspect right rear wheel area: sensor, tone ring, connector, and wiring for mechanical damage, debris or corrosion
Check connector pins for corrosion, bent pins, or water intrusion; unplug and inspect both halves
Visually check tone ring for missing/broken teeth, heavy rust, or physical damage
Check wheel bearing play and axle/hub mounting condition
Perform a wiggle test: move wiring and connector while monitoring live data or check light for intermittent changes

Signal parameters

Passive (variable reluctance) sensor: DC resistance typically a few hundred to a few thousand ohms (manufacturer specific). Produces AC voltage that increases in amplitude and frequency with wheel speed (mV to volts depending on system). At low speed expect low AC mV that increases smoothly with speed.
Active (Hall/electronic) sensor: has a supply (commonly 5 V or vehicle reference) and produces a square wave/digital pulse. Signal swings between ~0 V and supply voltage (0–5 V common; some systems use up to vehicle voltage). Frequency proportional to wheel speed.
Expected behavior: smooth, continuous waveform with frequency proportional to wheel rotation and no dropouts, no stuck-high or stuck-low condition, and no unexpected DC shorts to battery or ground.

Diagnostic algorithm

Connect a scan tool and observe right rear wheel speed live data while spinning the wheel by hand or driving slowly; compare with other wheel speeds for consistency.
Visually inspect sensor, harness, and connector for damage, contamination, or corrosion; repair any obvious faults and recheck.
Back-probe the sensor connector: for active sensors verify reference voltage present and check signal waveform while spinning wheel; for passive sensors measure AC output (mV) while rotating wheel. Use an oscilloscope for waveform confirmation if available.
Measure sensor resistance (for passive sensors) and compare to manufacturer spec; check for short to battery or ground on the signal wire with an ohmmeter.
Perform continuity check from the ABS module connector to the sensor connector pins to confirm no opens; wiggle harness in suspension travel to reveal intermittent faults.
Inspect tone ring/reluctor for missing or damaged teeth and measure air gap between sensor and ring; correct alignment or replace damaged component.
If available and safe, swap the right rear sensor with a known-good sensor from another corner with the same type to see if the code follows the sensor (only if sensors are identical and swap is safe).
Check ABS module grounds and power supplies; inspect for other modules reporting communication faults that might affect speed input.
Clear codes and road-test to verify repair. If the fault returns with no wiring/sensor issue found, consider ABS module internal fault and module bench testing or replacement as a last resort.

Likely causes

Failed or contaminated right rear wheel speed sensor
Wiring damage or connector corrosion at right rear sensor
Tone ring damage, missing teeth, or excessive gap
Intermittent short/open caused by harness chafe at suspension or hub

Fault status

⚠️ Status

Right Rear Wheel Speed Sensor Circuit Malfunction detected by ABS/ESC module. Wheel speed input is missing, out-of-range, or intermittent on right rear sensor circuit; ABS/traction functions may be limited.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours