The rear audio module sees the rear audio switch circuit shorted to ground
What it means
B113B. The rear audio module sees the rear audio switch circuit shorted to ground. A rear control may not work and the radio may react on its own.
Findings, check these first
- Short to ground in the switch circuit
- Faulty rear audio switch
- Chafed switch wiring
- Poor switch connector
- Faulty rear audio and temperature control module
Standard procedure
- Confirm the code and test the rear audio switch
- Inspect the switch and its connector
- Check the switch circuit for a short to ground
- Verify the switch resistance 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.
- B113B FORD Rear Audio Switch Circuit Short to Ground: 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.
- B113b Ford - Rear Audio Switch Circuit Short to Ground | 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 B113B. Include your vehicle, the issue and a source if you have one.