OBD
P2505
ECM/PCM Power Input Signal
What it means
P2505 means ECM/PCM Power Input Signal.
Check these first
- A loose or corroded battery or starter connection
- A weak battery
- An alternator that does not charge
- An open or short in the ECM/PCM power feed
What to do next
- Read ECM/PCM power input voltage on a scan tool
- Check the battery and starter connections
- Load test the battery and charging system
- Test the ECM/PCM power feed for an open or short
- Repair the power feed if the supply tests good
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.