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)
The powertrain control module (PCM) is on the controller area network (CAN) communication network and the SCP network. The PCM uses the CAN network to communicate with the diagnostic tool and utilizes the SCP network to communicate with other modules. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage. Refer to INTRODUCTION article in ENGINE PERFORMANCE for diagnosis and testing of the PCM.
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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.