2010 Porsche Panamera Turbo (970) V8-4.8L Turbo A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 349
Fault setting conditions
- 2. gear cannot be disengaged
Fault effects
- Gear held
- No gear pre-selection
- Transmission limp-home indication in instrument cluster control unit
Engagement Block, Synchronisation, Or Gear Skip
P177C
Diagnosis information - PDK
Engagement block, synchronisation, or gear skip
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, P1734
Possible fault causes
- Clutch faulty
- Hydraulics faulty
Fault setting conditions
- Limit for number of permissible gear skips exceeded
Fault effects
- Reduced gear selection
- Transmission limp-home indication in instrument cluster control unit
Synchro Reverse Gear Not Disengageable
P177C
Diagnosis information - PDK
Synchro reverse 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
- Reverse gear cannot be disengaged
Fault effects
- Gear held
- No gear preselection
- Transmission limp-home indication in instrument cluster control unit
Synchro Reverse Gear Not Engageable Or Gear Skip
P177C
Diagnosis information - PDK
Synchro reverse gear not engageable or gear skip
