B12C4
Mirror Turn Indicator Circuit Short
B12C4 is an OBD-II diagnostic trouble code meaning: Mirror Turn Indicator Circuit Short. Common causes: short circuit in the mirror turn signal wiring, malfunction of the turn signal itself. Estimated repair cost: $22–89.
Symptoms
- The turn signal on the side mirror does not work
- Flashing of all direction indicators at an increased frequency
- Turn signal fuse blown
Causes
- Short circuit in the mirror turn signal wiring
- Malfunction of the turn signal itself
- Damage to the wiring harness in the doorway
- Oxidation of contacts in connectors
How to Fix
- Check the turn signal fuse
- Visually inspect the wiring and connectors of the mirror turn signal
- Check continuity with a multimeter
- If necessary, replace the turn signal or damaged wires
- Clean oxidized contacts
Related codes
FAQ
What does the B12C4 code mean?
B12C4 is an OBD-II diagnostic trouble code that indicates: Mirror Turn Indicator Circuit Short
What causes a B12C4 error code?
The most common causes of B12C4 include: Short circuit in the mirror turn signal wiring; Malfunction of the turn signal itself; Damage to the wiring harness in the doorway; Oxidation of contacts in connectors.
How do I fix a B12C4 diagnostic trouble code?
To fix B12C4: Check the turn signal fuse. Visually inspect the wiring and connectors of the mirror turn signal. Check continuity with a multimeter. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B12C4?
Limited driving only, diagnose soon
How much does it cost to fix B12C4?
The estimated repair cost for B12C4 is $22–89. Actual cost depends on your vehicle, location, and labor rates.
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