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.
Powertrain Control Module (PCM)
Passive anti-theft system uses PCM to enable or disable vehicle's engine. Within one second after engine start, PCM must receive an enable signal or the engine will be disabled.
When system is functioning properly and ignition switch is turned to RUN or START position, THEFT indicator light will turn on for 2 seconds, then turn off. Vehicle will be enabled to start and run.
If THEFT indicator light is on continuously for 2 seconds then flashes for one minute, followed by Diagnostic Trouble Code (DTC) 16 that flashed 10 times, key code has been received but there is no PCM verification. If vehicle starts, PCM is not communicating with PATS module. If vehicle does not start, Multiplex Communications Network (MCN) may be faulty. Go to TROUBLE SHOOTING .
If THEFT indicator flashes for one minute, no key code was received. This is due to a damaged key, a non-encoded key, faulty wiring or PATS module fault.
If THEFT indicator flashes for 15 minutes. Key code received/vehicle has been disabled due to key not being programmed. See KEY INITIALIZATION under SERVICE PROCEDURES.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.