P0633
Immobiliser Key Not Programmed
The immobiliser system rejects the current key because it is not programmed to this vehicle. Engine start is inhibited.
The immobiliser system rejects the current key because it is not programmed to this vehicle. Engine start is inhibited.
Common causes
- high
Key not programmed to vehicle
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-440
- low
Immobiliser module fault
Less common, but worth ruling out after the more likely causes.
Typical part cost: $90-440
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P0633.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P0633.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P0633.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P0633 mean?
P0633 means "Immobiliser Key Not Programmed". It is a generic OBD-II code that points to a fault in the computer & auxiliary output controls.
What are the most common causes of P0633?
key not programmed to vehicle; immobiliser module fault — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P0633 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.