C1421
Open or Short in Master Cylinder Pressure Sensor
C1421 is an OBD-II diagnostic trouble code meaning: Open or Short in Master Cylinder Pressure Sensor. Common causes: broken or damaged sensor wiring harness, short circuit in the circuit. Estimated repair cost: $56–167.
Symptoms
- ABS/ESP indicator is on
- Disabling the stabilization system
- Incorrect ABS operation
- Errors in other brake-related systems
Causes
- Broken or damaged sensor wiring harness
- Short circuit in the circuit
- Oxidation of contacts
- Malfunction of the pressure sensor itself
- Problems with the ABS/ESP control unit
How to Fix
- Check the integrity of the wiring harness to the sensor
- Check contacts for corrosion
- Measure sensor resistance
- Check the reference voltage and signal from the sensor
- If necessary, replace the sensor or repair the harness
Related codes
FAQ
What does the C1421 code mean?
C1421 is an OBD-II diagnostic trouble code that indicates: Open or Short in Master Cylinder Pressure Sensor
What causes a C1421 error code?
The most common causes of C1421 include: Broken or damaged sensor wiring harness; Short circuit in the circuit; Oxidation of contacts; Malfunction of the pressure sensor itself.
How do I fix a C1421 diagnostic trouble code?
To fix C1421: Check the integrity of the wiring harness to the sensor. Check contacts for corrosion. Measure sensor resistance. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1421?
Limited driving only, diagnose soon
How much does it cost to fix C1421?
The estimated repair cost for C1421 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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