Transfer Box (VG)

Fault Code 2057

Voltage supply to brake for servo motor (A)

Diagnostic conditions
- Ignition on
- Transverse lock control unit internal function test
- Engine running
- Selector lever position 'P'
- Engage transverse lock

Possible causes of fault
- 'Short circuit to B+': short circuit in wiring harness (brake for servo motor continuously activated)
- 'Short circuit to B+': control unit faulty (brake for servo motor continuously activated)
- 'Open circuit/short circuit to ground': short circuit in wiring harness (brake for servo motor does not activate)
- 'Open circuit/short circuit to ground': short in servo motor winding or short circuit in servo motor leads (brake for servo motor does not activate)
- 'Open circuit/short circuit to ground': control unit faulty (brake for servo motor does not activate)

Affected pins
Transverse lock control unit plug:
- Pin 21 'supply voltage to brake for servo motor', to pin BI0 of 'servo motor plug B'

Diagnosis/troubleshooting

NOTE:
- Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock 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.
- Control unit replacement: Before replacing the 'transverse lock 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 1/ No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

Troubleshooting fault type: 'short circuit to B+'







Troubleshooting fault type: 'Open circuit/short circuit to ground'