OBD-II code · Powertrain (generic)
P0633 Immobiliser Key Not Programmed
The immobiliser system rejects the current key because it is not programmed to this vehicle. Engine start is inhibited.
Is it safe to drive with P0633?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyKey not programmed to vehicle
- Less likelyImmobiliser module fault
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
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Immobiliser, Ecm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.