C2141

Code

Generic C — Chassis

ABS wheel speed sensor circuit fault — right rear

Brand: Generic

Type: C — Chassis

Views: UK: 9 EN: 21 RU: 8

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted wheel speed sensor wiring (right rear)
Corroded, loose, or damaged connector at sensor or ABS harness
Failed right‑rear wheel speed sensor
Damaged, missing or contaminated tone/reluctor ring
Excessive wheel bearing play or physical damage near sensor
Water/contamination ingress at sensor/connector

Symptoms

ABS warning lamp illuminated
Traction control or stability control warning (TC/ESC) may be on or disabled
ABS/traction functions may engage incorrectly or be unavailable
Intermittent or permanent speed signal loss for right‑rear wheel
Possible inconsistent ABS activation or pulsation under braking
Brake/traction diagnostics may show low or zero wheel speed for right‑rear wheel

What to check

Read and record freeze‑frame data and all related ABS codes with a scan tool
Visually inspect right‑rear wheel sensor, connector, wiring harness and tone ring for damage, corrosion or contamination
Check for water, corrosion or pushed‑out pins at the sensor connector; reseat and inspect pins
Observe live wheel speed data while manually rotating wheel (scan tool) — look for missing or erratic RPM/speed for right‑rear
Backprobe sensor connector to check reference/ground/signal (if active sensor)
Measure sensor resistance/continuity (if applicable) and compare to OEM spec

Signal parameters

Passive (magnetic) sensors: generate AC voltage whose amplitude increases with wheel speed — small AC volts at low RPM rising to several volts at speed; frequency proportional to wheel speed
Active (hall/VR with electronics) sensors: produce digital pulse/square wave referenced to a supply (often 5 V or vehicle reference) — signal toggles between low and reference/ground; frequency proportional to wheel speed
Expected behavior: continuity (not open) at sensor leads for passive sensors; no short to chassis ground or battery. Signal should be clean and consistent as wheel rotates; amplitude/frequency should change smoothly with speed
Consult OEM spec for exact resistance, reference voltage and voltage levels for the vehicle being serviced

Diagnostic algorithm

Connect a scan tool and record ABS and related codes and freeze frame data
Visually inspect right‑rear sensor, connector, wiring harness and tone ring; repair any physical damage or contamination
With ignition on, backprobe the sensor connector and check for reference voltage and ground (active sensor) or continuity/resistance (passive) per OEM procedure
Spin the right‑rear wheel (raise vehicle safely on lift) while monitoring live wheel speed data — confirm sensor produces a stable speed signal
Measure AC output with a multimeter (AC volts) or an oscilloscope while spinning wheel; look for clean periodic waveform (passive) or clean digital pulses (active)
Perform a wiggle test on wiring and connectors while observing live data to find intermittent faults
If sensor wiring or connector is open/corroded, repair or replace wiring/connector and retest
If wiring and tone ring are good but no/weak signal, replace right‑rear wheel speed sensor and retest
After repair, clear codes and perform a road test to confirm proper operation and no reappearance of C2141
If fault remains after sensor/wiring/tone‑ring replacement, diagnose ABS control module inputs and grounds or consult OEM module diagnostics

Likely causes

Corroded connector or broken wire at the right‑rear sensor
Failed wheel speed sensor (internal open or short)
Damaged or missing tone ring teeth or heavy rust/debris on ring
Connector pins pushed out or bent allowing intermittent contact
Wire chafing to chassis ground under suspension movement

Fault status

⚠️ Status

C2141 — ABS wheel speed sensor circuit fault (right rear). Indicates open, short, intermittent or out‑of‑range signal from the right‑rear wheel speed sensor circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours