C1239
ABS Hydraulic Pressure Differential Switch Input Open Circuit
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)
Symptoms
- The ABS indicator on the dashboard is on
- Disabling the ABS system
- Incorrect operation of the anti-lock braking system
Causes
- Broken or damaged sensor wiring harness
- Oxidation of sensor contacts
- Differential pressure sensor malfunction
- Problems with the ABS control unit
How to Fix
- Check the integrity of the sensor wiring harness
- Clean the sensor contacts from oxidation
- Check sensor resistance
- If necessary, replace the differential pressure sensor
- Check the operation of the ABS control unit