Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Immobilizer Components And Replacement Guide
| Component: |
|---|
| Body Control Module (BCM) |
| Radio Frequency Hub (RFH) Module |
| Powertrain Control Module (PCM) |
| Electronic Steering Lock (ESL) Module |
| Electronic Control Unit (ECU) |
| Priority | Procedure Name | BCM | PCM | FOBIKs | RFH |
|---|---|---|---|---|---|
| 1 | Vehicle Reconfiguration | X | |||
| 2 | RFH Module Replace | X | |||
| 3 | Program Ignition FOBIKs | X | |||
| 4 | BCM Immobilizer Replace | X | |||
| 5 | Immobilizer ECUs Replaced | X | |||
| 6 | ECU Specific Procedures | X | X | X |
Example Scenario: If a user has replaced both the PCM and BCM, the table indicates the routines should be ran in the following order:
- Vehicle Reconfiguration
- BCM Immobilizer Replace
- Immobilizer ECUs Replaced
- ECU Specific Procedures
All procedure names in the table are how they will appear in the diagnostic scan tool.
If the BCM does not program, disconnect the battery, wait 15 seconds, reconnect the battery and run the BCM immobilizer replace routine again.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.