Loss of Ignition Diagnostic Module Input to PCM
Findings, check these first
- Open IDM signal wire
- Failed ignition module
- Corroded module connector
- Blown ignition fuse killing the module
- PCM input fault
Standard procedure
- Check ignition fuses first
- Test IDM signal wire continuity
- Verify module power and ground
- Inspect connectors
- Replace the module after circuit proof
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.
- OBDII.pro: P1356 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1356: Loss of Ignition Diagnostic Module Input to PCM
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
- P1356 FORD Code: Meaning, Causes, and Symptoms | OBD2 Codes
live reference page (obd2-codes.co)
Supports: Ford meaning for P1356: Loss Of Ignition Diagnostic Module Input To PCM
Fetched directly. obd2-codes.co phrasing matches the engine-codes family, so it counts as one publisher.
Last updated 2026-09-05.
Report a correction for P1356. Include your vehicle, the issue and a source if you have one.