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.
No Communication From A Control Module
The central electronic module (CEM) knows which control modules are in the control area network and checks that all the control modules communicate. If any control module on the control area network (CAN) does not communicate a diagnostic trouble code is stored in the central electronic module (CEM). There is a diagnostic trouble code (DTC) for each control module. The diagnostic trouble codes (DTCs) are CEM-DEXX.
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.