Fault Code 5520

Fault Code 5520

CAN Data Bus
Total failure of CAN drive communication

Diagnostic conditions
- Ignition on

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

Affected pins
Pin 24 and pin 40

Diagnosis/troubleshooting for vehicles with manual transmission

Work Instruction 1 - 2:

Work Instruction 3 - 7:

Work Instruction 8 - 12:

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

Diagnosis/troubleshooting for vehicles with Tiptronic transmission

Work Instruction 1 - 2:

Work Instruction 3 - 7:

Work Instruction 8 - 12:

Work Instruction 13 - 18:

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