C05F3

Code

Generic C — Chassis

Rear Drive Shaft Speed Sensor Circuit

Brand: Generic

Type: C — Chassis

Views: UK: 26 EN: 29 RU: 35

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in sensor wiring harness
Corroded, loose or damaged connector at sensor or module
Failed speed sensor (Hall-effect or variable reluctance)
Damaged or missing reluctor/tone ring or magnetic debris on ring
Incorrect air gap between sensor and tone ring
Poor power reference or ground to the sensor

Symptoms

ABS, traction control or stability control warning light illuminated
Speedometer or vehicle speed readings incorrect or intermittent
Traction control or ABS systems may be disabled or behave erratically
Diagnostic trouble code(s) stored for rear drive-shaft/speed sensor circuit
Possible limp-home mode or loss of certain drivability features

What to check

Read stored codes and freeze-frame/live data with a scan tool; note when the fault occurs
Compare rear drive shaft speed reading to other speed sensors and to calculated vehicle speed
Visually inspect sensor, tone ring/reluctor and the surrounding area for damage, missing teeth, metal debris or excessive air gap
Inspect the sensor connector for corrosion, bent pins, water intrusion, and secure mating
Back-probe connector to confirm sensor supply voltage (reference) and ground (for Hall sensors) with ignition ON
Measure sensor resistance with the connector unplugged (if specified by manufacturer)

Signal parameters

Hall-effect type: typically 3-wire (5 V reference, ground, signal). Signal is a square/pulse waveform that switches between near 0 V and reference (typically ~0–5 V). Frequency and pulse rate increase with rotational speed.
Variable reluctance (VR) type: 2-wire passive generator. Produces an AC voltage that increases with speed; at low speeds the AC may be a few hundred millivolts to a few volts RMS. Amplitude and frequency depend on tooth count and speed.
Typical waveform: clean, evenly spaced pulses with consistent amplitude. Distorted, noisy or missing pulses indicate sensor or tone ring issues.
Resistance (VR sensors): varies by design — commonly in the low hundreds to low thousands of ohms. Check vehicle-specific spec. Open or very high resistance indicates a failed sensor.
Air gap: clearance tolerances vary; excessive gap or contact will cause poor or no signal. Check vehicle specification for correct gap.

Diagnostic algorithm

Verify code and record freeze-frame/live data. Note if code is current or intermittent.
Visually inspect sensor, harness and tone ring for physical damage, debris, missing teeth or excessive corrosion. Repair obvious damage.
With ignition ON (engine off), back-probe the sensor connector: for Hall sensors confirm 5 V (or manufacturer reference), ground continuity, and the signal line idles near 0–5 V. For VR sensors confirm continuity across sensor leads (measure resistance) — compare to spec.
Rotate the driveshaft/wheel by hand (or safely raise and support vehicle) and observe live speed/signal data. For VR sensors measure AC voltage with a scope or AC meter; for Hall sensors observe switching signal with scope or scan tool. Look for a clean, regular waveform that correlates to rotation.
Perform a wiggle test: manipulate wiring and connector while monitoring the signal/data to find intermittent open or short.
If signal missing or out of range, isolate wiring: check continuity from sensor connector to control module and check for short-to-power or short-to-ground. Repair any damaged wiring or connectors.
If wiring and connectors are good but sensor does not produce correct waveform or resistance, replace sensor and retest.
If new sensor still fails or wiring/connector tests OK, check module power/ground and related fuses and relays. Scan for module errors and verify module inputs/outputs. Consider module repair/replacement only after all circuit and sensor checks pass.
After repair, clear codes and perform a test drive to confirm fault does not return and recorded speed values are correct.

Likely causes

Water ingress/corrosion at rear sensor connector
Broken insulation or chafed conductor near the axle or driveshaft
Sensor impacted or magnetized tone ring damaged by road debris
Connector pins pushed back/mis-seated at harness or module
Sensor failed due to heat or mechanical damage

Fault status

⚠️ Status

C05F3 — Rear drive shaft speed sensor circuit fault: signal missing, intermittent or out of expected range. Inspect sensor, tone ring, connector/wiring and module power/ground.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours