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.
Circuit/System Description
Certain modules use a security code as a means of theft deterrence. Each vehicle is assigned a specific four-digit security code at the time of manufacturer. This security code is used by multiple modules which require a correct security code to operate properly. If a security code is not programming or an incorrect security code is programmed which does not match that of the vehicle, vehicle starting is disabled.
The following modules utilize security code:
- Engine control module (ECM)
- Steering column module (CIM)
- Instrument panel cluster (IPC)
- Underhood electrical center (UEC)
- Rear electrical center (REC)
NO RELATED
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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.