What it means
This code has no generic meaning assigned by SAE J2012 or ISO 15031-6. Any description for it is manufacturer-specific.
How it works
C0235 has no generic SAE/ISO definition, so the title “Rear Wheel Speed Sensor Circuit Open” does not establish what the code means on a particular vehicle. If the vehicle-specific definition confirms that assignment, the ABS module is detecting an open circuit in a rear wheel-speed sensor circuit, but the affected wheel and setting conditions depend on that vehicle.
Common causes
Most likely first.
- Manufacturer-specific diagnostic definition
- Vehicle-specific scan-tool decoding
Symptoms
- Symptoms depend on the vehicle-specific meaning
How to diagnose it
- Confirm C0235’s definition using a scan tool that supports the vehicle and its service information; note which rear wheel, if either, is named.
- Read freeze-frame data and related ABS codes, then compare rear wheel-speed readings in live data to identify a missing signal if the vehicle-specific definition supports this diagnosis.
- Inspect the named rear wheel-speed sensor connector and harness for disconnection, corrosion, cuts, or chafing.
- Check the named sensor and tone ring or encoder for damage, debris, or poor seating where applicable.
- Test circuit continuity and the sensor using the vehicle-specific procedure and manufacturer’s specification; do not assume the ABS module is faulty until the circuit is verified.
Common fixes
- Use accurate vehicle-specific code information to identify the circuit C0235 refers to.
- Reconnect or clean the named rear sensor connector if it is loose or corroded.
- Repair an open or damaged section of the identified rear sensor wiring.
- Replace the named rear wheel-speed sensor if it fails the specified test.
- Repair a damaged tone ring or encoder, or address a confirmed ABS module input fault.
Can I keep driving?
The meaning may vary by vehicle, so check the vehicle-specific definition before assuming a rear wheel-speed fault. If ABS or traction warnings are present, drive cautiously because those systems may be limited, and avoid slippery conditions until the fault is identified.
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.