The body control module sees the ignition on relay B circuit shorted to battery
What it means
B112A. The body control module sees the ignition on relay B circuit shorted to battery. The run mode may stay powered when it should switch off.
Findings, check these first
- Short to voltage in the relay B circuit
- Faulty ignition on relay B
- Chafed relay wiring
- Poor relay or module connector
- Faulty body control module
Standard procedure
- Confirm the code and test the ignition on relay B circuit
- Inspect the relay and connectors
- Check the circuit for a short to voltage
- Verify module power and ground
- Replace the failed relay 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.
- B112A FORD Ignition On Relay 'B' Circuit Short To Battery: 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.
- B112a Ford - Ignition On Relay 'B' Circuit Short To Battery | 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 B112A. Include your vehicle, the issue and a source if you have one.