The body control module sees a fault in start button circuit B
What it means
B108C. The body control module sees a fault in start button circuit B. Push button starting can fail or the vehicle may not power up.
Findings, check these first
- Faulty start button switch
- Open circuit B wiring
- Short circuit B wiring
- Poor connector at the start button
- Faulty body control module
Standard procedure
- Confirm the code and test the start button
- Inspect the start button and its connector
- Check circuit B for an open or short
- Compare circuit A and circuit B readings
- Replace the failed switch or module after tests
Code lookup
Type a code above, or start from a symptom or a common code.
Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.
Sources and review
Review: checked against the recorded source material.
- B108C FORD: Code Meaning, Causes, Symptoms, & Tech Notes | Engine-Codes.com
archived reference page (engine-codes.com via Wayback Machine)
Supports: code identity, Ford meaning and possible causes
Fetched directly. Ford title, meaning and causes match the catalog record. Model and year fitment remain curator claims.
- B108C FORD Start Button Circuit 'B' | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Ford meaning and causes
Same Ford text as the engine-codes page (both sites share one publisher).
Last updated 2026-09-26.
Report a correction for B108C. Include your vehicle, the issue and a source if you have one.