C0291
Lost Communications With BCM
C0291 is an OBD-II diagnostic trouble code meaning: Lost Communications With BCM. Common causes: open circuit between ecu and bcm, damaged wiring harness. Estimated repair cost: $56–167.
Symptoms
- Failure of body systems (lighting, power windows, central locking)
- Inability to control body functions
- Check engine light on
Causes
- Open circuit between ECU and BCM
- Damaged wiring harness
- BCM malfunction
- Poor fixation of connectors
- BCM power problems
How to Fix
- Check the integrity of the wiring harness between the ECU and BCM
- Make sure the connectors are securely connected
- Check BCM supply voltage
- Test the BCM on another vehicle (if possible)
- Replace BCM if faulty
Related codes
Error C0291 by Vehicle Brand
FAQ
What does the C0291 code mean?
C0291 is an OBD-II diagnostic trouble code that indicates: Lost Communications With BCM
What causes a C0291 error code?
The most common causes of C0291 include: Open circuit between ECU and BCM; Damaged wiring harness; BCM malfunction; Poor fixation of connectors.
How do I fix a C0291 diagnostic trouble code?
To fix C0291: Check the integrity of the wiring harness between the ECU and BCM. Make sure the connectors are securely connected. Check BCM supply voltage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0291?
Limited driving only, diagnose soon
How much does it cost to fix C0291?
The estimated repair cost for C0291 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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