OBD-II code · Powertrain (generic, extended)
P2508 ECM/PCM Power Input Signal High
The ECM/PCM switched-battery input reads above the upper threshold. Most often caused by a charging system overvoltage (failed alternator regulator) or wrong jump-start procedure. Sustained high voltage risks damaging ECU electronics.
Is it safe to drive with P2508?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAlternator regulator overvoltage
- PossibleImproper external power source or jump-start
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
- Alternator Regulator, Power Distribution
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.