OBD-II code · Powertrain (generic, extended)
P2500 Generator Lamp/L-Terminal Circuit Low
The L-terminal feedback line from the alternator (charging warning lamp circuit) reads below the lower limit. The lamp may stay on, and battery voltage may drift if regulation feedback is also affected.
Is it safe to drive with P2500?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyL-terminal shorted to ground
- PossibleAlternator regulator failed
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Alternator, Charging Warning Lamp Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.