The liftgate and trunk module sees the trunk close button signal stuck low
What it means
B11C4. The liftgate and trunk module sees the trunk close button signal stuck low. The trunk close button may not work or the gate may not close..
Findings, check these first
- Faulty boot or trunk close button
- Boot or trunk close button harness open or shorted
- Poor electrical connection in the button circuit
- Faulty liftgate and trunk module
Standard procedure
- Confirm the code and test the close button signal
- Inspect the close button and its connector
- Check the button circuit for a short to ground
- Verify the module power and ground
- Replace the failed button 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.
- B11C4 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 B11C4
Fetched directly. B11C4 reads "Boot/Trunk Close Button Signal Stuck Low". obdii.pro carries no definition for this code, so there is no Ford-family corroboration.
Last updated 2026-10-02.
Report a correction for B11C4. Include your vehicle, the issue and a source if you have one.