C0138
Base Brake System Pressure Circuit/Sensor Low
C0138 is an OBD-II diagnostic trouble code meaning: Base Brake System Pressure Circuit/Sensor Low. Common causes: brake pressure sensor malfunction, wiring harness damage. Estimated repair cost: $56–167.
Symptoms
- The brake system fault indicator is on
- Deterioration of ABS and ESP performance
- Unusual behavior of the brake pedal
Causes
- Brake pressure sensor malfunction
- Wiring harness damage
- Short circuit in the circuit
- Sensor connection problems
- Brake ECU malfunction
How to Fix
- Check the connection of the pressure sensor and the condition of the connector
- Check the integrity of the wiring harness
- Check resistance and voltage at pressure sensor
- If necessary, replace the pressure sensor
- Check the operation of the brake system after repair
Related codes
Error C0138 by Vehicle Brand
FAQ
What does the C0138 code mean?
C0138 is an OBD-II diagnostic trouble code that indicates: Base Brake System Pressure Circuit/Sensor Low
What causes a C0138 error code?
The most common causes of C0138 include: Brake pressure sensor malfunction; Wiring harness damage; Short circuit in the circuit; Sensor connection problems.
How do I fix a C0138 diagnostic trouble code?
To fix C0138: Check the connection of the pressure sensor and the condition of the connector. Check the integrity of the wiring harness. Check resistance and voltage at pressure sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0138?
Limited driving only, diagnose soon
How much does it cost to fix C0138?
The estimated repair cost for C0138 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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