C1236
Left Rear Wheel Speed Sensor Input Signal Missing
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)
Symptoms
- ABS light is on
- ABS system is inactive
- ESP may turn off
- Possible problems with cruise control
Causes
- Broken or damaged wiring harness
- Wheel speed sensor malfunction
- Poor contact in the sensor connector
- Damage to the gear rotor (reference wheel)
- ABS control unit malfunction
How to Fix
- Check the integrity of the sensor wiring harness
- Check the connectors of the sensor and the ABS unit
- Test the wheel speed sensor (with an ohmmeter or oscilloscope)
- Replace the wheel speed sensor if necessary
- Check the condition of the reference wheel