U3031
Ignition Output Off
What it means
U3031 means Ignition Output Off.
Check these first
- A fault in the ignition output off circuit
- A failed module that will not release the ignition output
- A short holding the ignition output circuit live
- A component that stays powered after key off
What to do next
- Read ignition output off status on a scan tool
- Test the ignition output circuit for a short
- Inspect the ignition output wiring and connector
- Verify the output drops when the key is off
- Repair the circuit or replace the module if the output stays live
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.