CEM-DF13

Condition

Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that there is a short-circuit to supply voltage in the CAN H in the high speed network.

NOTE:
- In the event of DFxx diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replace as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors in the Control area network.
- The central electronic module (CEM) is the only control module that monitors the voltage level in the Control area network wiring.
- The central electronic module (CEM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit in one of the cables to ground or supply voltage. Do not replace the central electronic module (CEM) in the event of a CAN fault unless VADIS fault-tracing has indicated that the central electronic module (CEM) has an internal fault.

Substitute value

- The transmission control module (TCM) goes into Limp home mode.

Possible source

- Short-circuit to supply voltage in the high speed network.

Fault symptom[s]

- Deterioration in performance.
- Poor accelerator pedal (AP) response.
- Malfunction indicator lamp (MIL) lit.
- Message in the display.