C1291
Open Brake Lamp Switch Contacts During Deceleration
C1291 is an OBD-II diagnostic trouble code meaning: Open Brake Lamp Switch Contacts During Deceleration. Common causes: faulty brake light switch, break in the wiring harness to the switch. Estimated repair cost: $22–89.
Symptoms
- Check engine light is on
- Cruise control doesn't work
- Incorrect ABS/ESP operation
- Brake lights do not turn on or are constantly on
- The stabilization system is disabled
Causes
- Faulty brake light switch
- Break in the wiring harness to the switch
- Poor electrical contact in connectors
- Corrosion of switch contacts
- Incorrect switch position adjustment
How to Fix
- Diagnosing the status of the brake light switch
- Checking the voltage at the switch contacts
- Inspect the wiring harness for damage
- Replacing a faulty switch if necessary
- Cleaning and restoring contacts in connectors
- Resetting the error code and checking the system operation
Related codes
FAQ
What does the C1291 code mean?
C1291 is an OBD-II diagnostic trouble code that indicates: Open Brake Lamp Switch Contacts During Deceleration
What causes a C1291 error code?
The most common causes of C1291 include: Faulty brake light switch; Break in the wiring harness to the switch; Poor electrical contact in connectors; Corrosion of switch contacts.
How do I fix a C1291 diagnostic trouble code?
To fix C1291: Diagnosing the status of the brake light switch. Checking the voltage at the switch contacts. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1291?
Do not drive — repair immediately
How much does it cost to fix C1291?
The estimated repair cost for C1291 is $22–89. Actual cost depends on your vehicle, location, and labor rates.
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