C1351

Code

Generic C — Chassis

Right rear wheel speed sensor circuit malfunction

Brand: Generic

Type: C — Chassis

Views: UK: 3 EN: 7 RU: 1

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Page language: EN

ABS and/or traction control (TCS) warning lamp illuminated
Reduced or disabled ABS/TCS functionality; DSC/ESP fault messages
Possible ABS activation at inappropriate times or no ABS activation
Cruise control or speed-dependent systems may behave erratically
Occasional or permanent loss of wheel speed reading for the right rear on a scan tool

Read and record freeze frame and stored ABS/traction codes with a proper scan tool
Visually inspect RR sensor, connector, wiring loom, and tone ring for damage, corrosion or missing teeth
With ignition on, backprobe sensor power/ground (if active sensor) and check reference voltage with a multimeter
Measure sensor resistance (passive type) or check signal voltage/pulse (active type) at the connector
Wiggle the harness and connectors while watching live wheel speed data for intermittent changes
Inspect wheel bearing play/axle movement that could alter sensor gap

Passive (variable-reluctance) sensor: DC resistance typically ~500–1500 ohms (manufacturer-specific). Generates AC voltage with wheel rotation — small VAC at low speed, increasing with speed.
Active (Hall/VR with electronics) sensor: reference supply typically 5 V or 12 V; output is a pulsed square wave ~0–5 V (or 0.5–4.5 V) referenced to ground. Pulse frequency increases with wheel speed.
At low wheel speed expect small AC or low-frequency pulses; at higher speeds frequency typically tens to hundreds of Hz. Exact values are vehicle-specific — consult OEM data.
Open-circuit = infinite resistance; short-to-ground/power will show near-zero or near-battery voltage on signal line respectively.

Read ABS/traction system trouble codes and freeze-frame data with a capable scan tool; note if other wheel sensors or modules report faults.
Visually inspect RR sensor, connector, harness routing, clips, and tone ring. Look for corrosion, bent pins, chafing, missing teeth, or contamination.
Identify sensor type (passive vs active) from service literature. If passive, disconnect sensor and measure DC resistance between sensor terminals; compare to spec. If active, check for proper reference voltage/power to the sensor with ignition ON.
With connector disconnected, check for continuity between sensor ground and module ground. Check for short to battery on the signal wire (measure voltage present with ignition on).
Backprobe the sensor connector (or use a lab scope) while spinning the wheel (on a lift) or on-road to observe signal waveform/frequency and amplitude. Look for dropouts or noise while wiggling harness.
Repair or replace damaged wiring, connectors, or the sensor as indicated. Clean or replace tone ring if damaged or contaminated. Secure harness away from heat/interference sources.
After repairs, clear codes and perform a functional test: road test or lift-wheel spin while monitoring live wheel speed values to confirm stable, accurate RR sensor readings and no reoccurrence of C1351.
If wiring and sensor check OK but code persists, inspect ABS module input driver for fault; consider module testing/repair per OEM procedures.

⚠️ Status

Right rear wheel speed sensor circuit malfunction detected by ABS/traction module — signal missing, out of range, open or short condition present.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-1.5 hours

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