Fault Code 5520

Fault Code 5520

CAN data bus (drive)
Total failure of CAN drive communication

Diagnostic conditions
- Ignition on

Possible cause of fault
- Short circuit to B+/ground/between lines or open circuit in CAN drive
- One or more control units connected directly to CAN drive are faulty
- PSM control unit faulty

Affected pins
Pin 24 and pin 40

Diagnosis/troubleshooting for vehicles with manual transmission

Before troubleshooting, read out the fault memory of the DME and instrument cluster and remedy any faults present.

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Diagnosis/troubleshooting for vehicles with Tiptronic transmission

Before troubleshooting, read out the fault memory of the DME, Tiptronic and instrument cluster, and remedy any faults present

Part 1:

Part 2:

Part 3:

Part 4:

Part 5: