What it means
The control module monitors the rear drive shaft speed sensor signal. It sets this code when the signal circuit has a detected fault.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The rear drive shaft speed sensor sends shaft rotation information to the control module, which can use it for ABS and traction control. This code sets when the module detects a fault in the rear sensor circuit, without identifying a specific low, high, intermittent, or range condition.
Common causes
Most likely first.
- Failed speed sensor
- Damaged or disconnected wiring
- Corroded or loose connector
- Fault in the control module
Symptoms
- ABS or traction-control warning light on
- ABS or traction control may be disabled
How to diagnose it
- Read freeze-frame data and check rear drive shaft speed live data for a missing or implausible reading alongside any related ABS or traction-control codes.
- Inspect the rear sensor and its target area for physical damage, debris, a loose sensor, or a disconnected connector.
- Check the sensor connector and harness for corrosion, loose terminals, chafing, or breaks.
- Test the rear drive shaft speed sensor circuit and sensor operation using the manufacturer's wiring information and procedure.
- If the sensor and wiring pass, check the relevant control-module connections and follow the manufacturer's diagnostic procedure before suspecting module failure.
Common fixes
- Reconnect and secure the rear drive shaft speed sensor connector.
- Clean corroded terminals and repair damaged wiring or connector seals.
- Replace the rear drive shaft speed sensor if it fails the specified test.
- Repair a damaged sensor target or mounting point if it prevents a reliable reading.
- Repair or replace a faulty control module only after its power, grounds, connections, and circuit have been verified.
Can I keep driving?
ABS or traction control may be disabled, so drive cautiously and allow extra stopping distance. Avoid slippery roads until the rear speed signal is reliable.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.