OBD-II code · Powertrain (generic, extended)
P2511 ECM/PCM Power Relay Sense Circuit Intermittent
The sense (feedback) line that lets the ECM verify the main power relay has actually closed shows intermittent dropouts. The ECM expects to see battery voltage on this line whenever the relay is energised — short losses suggest aged contacts, vibration or chafed wiring.
Is it safe to drive with P2511?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAged main relay contacts
- PossibleChafed sense wire shorting intermittently
- Less likelyConnector with intermittent contact under vibration
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.4–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Main Relay, Sense Wire
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.