P0633 OBD-II: Immobilizer Key not Programmed - ECM/PCM
P0633 Severity
Should you fix P0633 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0633?
The ignition key has not been programmed to the vehicle. If an unprogrammed key is used to attempt to start the vehicle, code P0633 will set and the anti-theft light will be illuminated.
Need a P0633 diagnosis? Trust our experts.
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OBD II Fault Code
- OBD II P0633
OBD-II Code Engine may not start is defined as a Immobilizer Key not Programmed - ECM/PCM
The ignition key has not been programmed to the vehicle. If an unprogrammed key is used to attempt to start the vehicle, code P0633 will set and the anti-theft light will be illuminated.
Engine may not start Symptoms
- Anti-theft light illuminated
- Engine may not start
Common Problems That Trigger the P0633 Code
- Anti-theft control module failure
- Key in use is not programmed to the vehicle
- Wiring issue
Ask our experts about P0633.
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