OBD-II code · Powertrain (generic, extended)
P2505 ECM/PCM Power Input Signal
The ECM/PCM monitors the main switched battery feed (typically terminal 15 / ignition-switched supply via the main relay). A general fault is reported — either the input is missing entirely or it does not match the expected timing relative to ignition state. Engine may not start or stay running.
Is it safe to drive with P2505?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFailed main relay
- PossibleBlown fuse on the ECM power feed
- PossibleCorroded connector pin at the ECM
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Main Relay, Power Input Wire, Ecm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.