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.
General information
Figures shown are only examples.
HINT: For general information about CAN-troubleshooting, see:
- General about CAN-related diagnostic trouble codes.
CEM-DF01 - DF17 can only be stored in Central electronic module (CEM). these diagnostic trouble codes are stored when an electric fault is detected in CAN-lines. tart with these diagnostic trouble codes first.
CEM-1AXX only stored in Central electronic module (CEM). one diagnostic trouble code for every control module on the CAN-net. these diagnostic trouble codes indicate that Central electronic module (CEM) does not receive any reply from other control modules.
XXX-E000 (HS-CAN)/E001 (LS-CAN) can be stored in all CAN-connected control modules. these diagnostic trouble codes indicate that the control module has detected interference on the CAN-net.
XXX-E003 can be stored in all CAN-connected control modules except in Central electronic module (CEM). The control modules on the CAN-net listen for a message (identity number) that is sent out at regular intervals from Central electronic module (CEM). his diagnostic trouble code indicates that the control module has not received any identity number, or that the expected number is not correct. interference on the CAN-net can also store this diagnostic trouble code.
NOTE:In case of CAN-related faults, it is likely that a combination of above diagnostic trouble codes occur.
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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.
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