C1238
ABS Hydraulic Pressure Differential Switch Input Circuit Failure
C1238 is an OBD-II diagnostic trouble code meaning: ABS Hydraulic Pressure Differential Switch Input Circuit Failure. Common causes: malfunction of the differential pressure sensor, open or shorted wiring harness. Estimated repair cost: $56–167.
Symptoms
- ABS light is on
- ABS does not activate when braking
- Uneven braking on slippery surfaces
Causes
- Malfunction of the differential pressure sensor
- Open or shorted wiring harness
- Problems with sensor connectors
- ABS control unit malfunction
How to Fix
- Diagnosing the Sensor Circuit Using a Multimeter
- Checking the resistance and voltage on the sensor
- Inspect the wiring harness for damage
- Replacing the sensor or repairing the circuit if necessary
- Resetting errors and testing the system
Related codes
FAQ
What does the C1238 code mean?
C1238 is an OBD-II diagnostic trouble code that indicates: ABS Hydraulic Pressure Differential Switch Input Circuit Failure
What causes a C1238 error code?
The most common causes of C1238 include: Malfunction of the differential pressure sensor; Open or shorted wiring harness; Problems with sensor connectors; ABS control unit malfunction.
How do I fix a C1238 diagnostic trouble code?
To fix C1238: Diagnosing the Sensor Circuit Using a Multimeter. Checking the resistance and voltage on the sensor. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1238?
Do not drive — repair immediately
How much does it cost to fix C1238?
The estimated repair cost for C1238 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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