The body control module sees the keyless entry keypad illumination circuit shorted to ground
What it means
B121A. The body control module sees the keyless entry keypad illumination circuit shorted to ground. The keypad buttons may not light up..
Findings, check these first
- Faulty keyless entry keypad
- Keyless entry keypad harness open or shorted
- Poor electrical connection in the illumination circuit
- Faulty body control module
Standard procedure
- Confirm the code and test the keypad illumination circuit
- Inspect the keyless entry keypad and its connector
- Check the illumination circuit for a short to ground
- Verify the module power and ground
- Replace the failed keypad 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: qualified. Read the source limits below.
- B121A FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes - OBD2 Codes
live reference page (obd2-codes.co)
Supports: FORD and Ford-family meaning and likely causes for B121A
Fetched directly. B121A reads "Keypad Illumination Output Circuit Short to Ground". obdii.pro carries no definition for this code, so there is no Ford-family corroboration.
Last updated 2026-10-02.
Report a correction for B121A. Include your vehicle, the issue and a source if you have one.
This fault is part of the Ford PATS and no-start codes guide. It covers the family and the order to check it.