2010 Porsche Panamera Turbo (970) V8-4.8L Turbo A L L Diagnostic Trouble Codes ( DTC ): P Code Charts Page 672
- Transmission limp-home indication in instrument cluster control unit
Setpoint Definitions
P1838
Setpoint definitions
NOTE: The specified values and value ranges correspond to the OK state in each case.
Line test setpoints
Short circuit to B+:
- Setpoint voltage -0.5 V --> +0.5 V
Short circuit to ground:
- Setpoint resistance > 0.9 MOhm
Open circuit:
- Setpoint resistance < 2 Ohm
Control unit setpoints
- Supply voltage terminal 30 9.1 V --> 16.4 V
- Voltage, terminal 15 9.5 V --> 16.0 V
Diagnosis Information - PDK (Dual-Clutch Transmission)
P1838
Diagnostic information - PDK
Power supply for pressure regulator 1 (clutch 1), short circuit to B+
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 fault is not detected: P1752
Possible fault causes
- Line between pressure regulator 1 and PDK control unit faulty
- Pressure regulator 1 faulty
- PDK control unit faulty
Fault setting conditions
- Actual measured voltage HS1 > 4 V
Fault effects
- Power supply switch-off, pressure regulator clutch 1
- Pressure regulator clutch 1, switch-off
- No gear preselection
- No R gear
- Only gears 2, 4 and 6 are possible
- White transmission limp-home indication in instrument cluster
Power Supply For Pressure Regulators 2 (Clutch 2) And 3 (Lubrication Pressure/Cooling
Pressure), Open Circuit
P1839
Diagnosis information - PDK
Power supply for pressure regulators 2 (clutch 2) and 3 (lubrication pressure/cooling pressure), open circuit
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 fault is not detected: P1752
