Transfer Box

Fault code 2058

Ground supply to brake for lock motor (B)

Diagnostic conditions
- Ignition on
- Internal transfer box control unit function test
- Engine running
- Selector lever position 'P'
- Engage longitudinal lock/gear reduction

Possible causes of fault
- 'Short circuit to B+': short circuit in wiring harness (brake for servo motor does not activate)
- 'Short circuit to B+': short circuit in wiring harness (brake for servo motor does not activate)
- 'Short circuit to B+': control unit faulty (brake for servo motor does not activate)

Affected pins
Transfer box control unit plug:
- Pin 36 'ground supply to brake for servo motor (B)', to pin A3 of servo motor plug A'

Diagnosis/troubleshooting

NOTE:
Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transfer box control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

NOTE: Control unit replacement: Before replacing the 'transfer box control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transfer box control unit' should be detected and remedied.

Troubleshooting fault type: 'short circuit to B+'