2010 Porsche Panamera Turbo (970) V8-4.8L Turbo A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 351
Possible fault causes
- Hydraulics faulty (hydraulic control unit)
- Transmission faulty
Fault setting conditions
- 2nd gear cannot be disengaged
Fault effects
- Gear held
- No gear preselection
- Transmission limp-home indication in instrument cluster control unit
Synchro 3rd Gear Not Disengageable
P177C
Diagnosis information - PDK
Synchro 3rd gear not disengageable
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
- The following faults are not detected: P1731, P1732, P1733 or P1734
- The following faults are not detected: P1706 or P1707
- Alternative measure HSS3_OFF not active
Possible fault causes
- Hydraulics faulty (hydraulic control unit)
- Transmission faulty
Fault setting conditions
- 3rd gear cannot be disengaged
Fault effects
- Gear held
- No gear preselection
- Transmission limp-home indication in instrument cluster control unit
Synchro 4th Gear Not Disengageable
P177C
Diagnosis information - PDK
Synchro 4th gear not disengageable
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
- The following faults are not detected: P1731, P1732, P1733 or P1734
- The following faults are not detected: P1706 or P1707
- Alternative measure HSS3_OFF not active
Possible fault causes
- Hydraulics faulty (hydraulic control unit)
- Transmission faulty
Fault setting conditions
- 4th gear cannot be disengaged
Fault effects
- Gear held
- No gear preselection
- Transmission limp-home indication in instrument cluster control unit
Synchro 5th Gear Not Disengageable
