OBD-II code · Powertrain (generic)
P0623 Generator Lamp Control Circuit
Generic generator warning lamp control circuit fault, often used where the lamp terminal designation is not L or where multiple lamps share a single output.
Is it safe to drive with P0623?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyLamp circuit open or shorted
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Alternator, Alternator Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.