B166F
Right Trailer Tow Lamp Control Circuit Low
B166F is an OBD-II diagnostic trouble code meaning: Right Trailer Tow Lamp Control Circuit Low. Common causes: broken or damaged wiring harness to the right trailer lamp, oxidation of contacts in connectors. Estimated repair cost: $6–33.
Symptoms
- Inoperative right trailer lamp
- Error message on the dashboard
- Circuit protection trip (if provided)
Causes
- Broken or damaged wiring harness to the right trailer lamp
- Oxidation of contacts in connectors
- Burnt out lamp
- Trailer control module malfunction
- Short circuit in the circuit
- Chain ground problems
How to Fix
- Check the condition of the right trailer lamp and replace if necessary
- Inspect the wiring harness for damage
- Check the contacts in the circuit connectors
- Measure the circuit resistance with a multimeter
- Check for voltage at the terminals of the trailer control module
- Check the condition of the chain mass
Related codes
FAQ
What does the B166F code mean?
B166F is an OBD-II diagnostic trouble code that indicates: Right Trailer Tow Lamp Control Circuit Low
What causes a B166F error code?
The most common causes of B166F include: Broken or damaged wiring harness to the right trailer lamp; Oxidation of contacts in connectors; Burnt out lamp; Trailer control module malfunction.
How do I fix a B166F diagnostic trouble code?
To fix B166F: Check the condition of the right trailer lamp and replace if necessary. Inspect the wiring harness for damage. Check the contacts in the circuit connectors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B166F?
Do not drive — repair immediately
How much does it cost to fix B166F?
The estimated repair cost for B166F is $6–33. Actual cost depends on your vehicle, location, and labor rates.
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