P1938
Brake Switch/Sensor Signal
P1938 is an OBD-II diagnostic trouble code meaning: Brake Switch/Sensor Signal. Common causes: faulty brake sensor, open or short circuit in the sensor circuit. Estimated repair cost: $6–33.
Symptoms
- Cruise control doesn't work
- Brake lights stay on or don't turn on
- Check Engine light comes on
- Problems with the ABS system
- The car does not switch from parking mode
Causes
- Faulty brake sensor
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Mechanical failure of the brake pedal
- Problems with the control unit
How to Fix
- Check the condition of the brake sensor
- Inspect the wiring harness and connectors for damage.
- Check the voltage and resistance in the sensor circuit
- Replace the brake sensor if necessary
- Test the operation of the system after repair
Related codes
FAQ
What does the P1938 code mean?
P1938 is an OBD-II diagnostic trouble code that indicates: Brake Switch/Sensor Signal
What causes a P1938 error code?
The most common causes of P1938 include: Faulty brake sensor; Open or short circuit in the sensor circuit; Poor contact in the sensor connector; Mechanical failure of the brake pedal.
How do I fix a P1938 diagnostic trouble code?
To fix P1938: Check the condition of the brake sensor. Inspect the wiring harness and connectors for damage.. Check the voltage and resistance in the sensor circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1938?
Limited driving only, diagnose soon
How much does it cost to fix P1938?
The estimated repair cost for P1938 is $6–33. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat