E5C4

What the Code Means

E5C4 points to a fault in the K-CAN bus wire (body CAN) running to the CID, the central information display. K-CAN links the various body modules, and damage to the line disrupts data exchange across the whole circuit.

The wire fault can be a short, an open, or corrosion in the wiring harness. As a result, the control module loses communication not only with the CID but also with other body modules on the same bus.

Symptoms

• blank or flickering CID screen;
• no audio;
• loss of iDrive functions;
• multiple warning indicators on the instrument cluster.

Diagnosis and Repair

1. Inspect the K-CAN wiring at the CID connector and along the full length of the harness.
2. Check the connector contacts for bent pins and corrosion.
3. Repair or replace the damaged sections of wiring.
4. Clear the codes and run a check of the display and bus operation.

Secondary Problems

• A prolonged K-CAN fault can cause malfunctions in other body modules: lighting, door locks, and the alarm system. Don't put off the wiring repair — the failure spreads across the whole bus.