The body control module sees an open in the key in ignition switch circuit
What it means
B10F1. The body control module sees an open in the key in ignition switch circuit. The warning chime can sound all the time or not at all.
Findings, check these first
- Faulty key in ignition switch
- Open or shorted switch wiring
- Poor switch connector
- Faulty body control module
- Faulty instrument panel cluster
Standard procedure
- Confirm the code and test the key in switch
- Inspect the switch and its connector
- Check the switch circuit for an open
- Verify body and cluster inputs
- 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.
- B10F1 FORD Key In Switch Circuit Open: 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.
- B10f1 Ford - Key In Switch Circuit Open | AutoCodes.com
archived reference page (autocodes.com via Wayback Machine)
Supports: corroboration of Ford meaning and causes
Fetched directly. Same Ford text as the engine-codes page (both sites share one publisher).
Last updated 2026-09-29.
Report a correction for B10F1. Include your vehicle, the issue and a source if you have one.