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 Description
Serial data communication bus consists of 4 components. Powertrain Control Module (PCM), Diagnostic Energy Reserve Module (DERM), Electronic Brake Control Module (EBCM) and electronic Instrument Panel Cluster (IPC). IPC is the master of this network and sends out a message through serial data to other modules. Each module responds back to IPC with updated information. If any module does not respond back to IPC, a DTC is set in each applicable module.
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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.