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.
2009 Chrysler 300 V6-2.7LFACTORY OEM SERVICE PROCEDURE
Ignition Circuit Sense
IGNITION CIRCUIT SENSE
The ignition switch power feeds to the PCM originate from the Integrated Power Module (IPM) after it determines what position the ignition key is in. The ACC and Run/Start feeds are hard wired from the IPM to the PCM. There is no hard wire Start feed to the PCM, because the IPM indicates via a CAN bus message to the PCM when the key is in the START (Crank) position.
Factory Service Tools
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.