Technical Ducato Transmission Faults

[BruneyC]

I have a red cog annd ann orange engine warning and stuck in limp mode with very clunky selection D/R/N on 9 speed automatic on 2020 Ducato.

OBD essentially shows two distinct faults:
P0895 Solenoid "E" Control Circuit Low &
P1DB2 Actuator Supply Voltage A Circuit

Question is,
1. do I replace transmission oil (no idea how) and try to reset error - then drive to commercial service agent for thorough diagnosis and repair?
2. reset error - then drive to commercial service agent for thorough diagnosis and repair?
3. Top up 250ml of transmission oil - reset error - then drive to commercial service agent for thorough diagnosis and repair?

Details:
Transmission Error

error code P0985.

What causes this problem with the Shift Solenoid "E" Control Circuit Low?

• Fault in the pressure control solenoid valve 'E'
• The harness of the Pressure control solenoid valve 'E' is open or shorted
• The circuit of the Pressure control solenoid valve 'E' has poor electrical connection
• Issue with the Engine Control Module (ECM)
• Low level of the automatic transmission fluid
• Dirty or contaminated auto transmission fluid

Make:FIAT

Code: P1DB2

Definition: Actuator Supply Voltage A Circuit

Description:

The voltage supply circuit(s) for the solenoids and pressure regulators are monitored for open circuits, shorts to ground, and shorts to voltage. If a failure is detected, the Transmission Control Module (TCM) will deactivate the affected power supply circuit and set a corresponding Diagnostic Trouble Code (DTC) relevant to the fault that was detected.

Cause:

• SOLENOID 1 SUPPLY CIRCUIT OPEN
• SOLENOID 1 SUPPLY CIRCUIT SHORTED TO GROUND
• SOLENOID 2 SUPPLY CIRCUIT OPEN
• SOLENOID 2 SUPPLY CIRCUIT SHORTED TO GROUND
• DOG CLUTCH A SOLENOID OR RELATED CONTROL CIRCUIT
• DOG CLUTCH F SOLENOID OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID LINE PRESSURE OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID TORQUE CONVERTER OR RELATED CONTROL CIRCUIT
• LIMP HOME MODE (Park by cable) or HYDRAULIC PARK LOCK SOLENOID (Park by wire) OR RELATED CONTROL CIRCUIT
• HOLDING MAGNET PARK LOCK SOLENOID (Park by wire) OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID B OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID C OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID D OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID E OR RELATED CONTROL CIRCUIT
• TRANSMISSION CONTROL MODULE (TCM)

 

[Kengle]

I have a red cog annd ann orange engine warning and stuck in limp mode with very clunky selection D/R/N on 9 speed automatic on 2020 Ducato.

OBD essentially shows two distinct faults:
P0895 Solenoid "E" Control Circuit Low &
P1DB2 Actuator Supply Voltage A Circuit

Question is,
1. do I replace transmission oil (no idea how) and try to reset error - then drive to commercial service agent for thorough diagnosis and repair?
2. reset error - then drive to commercial service agent for thorough diagnosis and repair?
3. Top up 250ml of transmission oil - reset error - then drive to commercial service agent for thorough diagnosis and repair?

Details:
Transmission Error

error code P0985.

What causes this problem with the Shift Solenoid "E" Control Circuit Low?

• Fault in the pressure control solenoid valve 'E'
• The harness of the Pressure control solenoid valve 'E' is open or shorted
• The circuit of the Pressure control solenoid valve 'E' has poor electrical connection
• Issue with the Engine Control Module (ECM)
• Low level of the automatic transmission fluid
• Dirty or contaminated auto transmission fluid

Make:FIAT

Code: P1DB2

Definition: Actuator Supply Voltage A Circuit

Description:

The voltage supply circuit(s) for the solenoids and pressure regulators are monitored for open circuits, shorts to ground, and shorts to voltage. If a failure is detected, the Transmission Control Module (TCM) will deactivate the affected power supply circuit and set a corresponding Diagnostic Trouble Code (DTC) relevant to the fault that was detected.

Cause:

• SOLENOID 1 SUPPLY CIRCUIT OPEN
• SOLENOID 1 SUPPLY CIRCUIT SHORTED TO GROUND
• SOLENOID 2 SUPPLY CIRCUIT OPEN
• SOLENOID 2 SUPPLY CIRCUIT SHORTED TO GROUND
• DOG CLUTCH A SOLENOID OR RELATED CONTROL CIRCUIT
• DOG CLUTCH F SOLENOID OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID LINE PRESSURE OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID TORQUE CONVERTER OR RELATED CONTROL CIRCUIT
• LIMP HOME MODE (Park by cable) or HYDRAULIC PARK LOCK SOLENOID (Park by wire) OR RELATED CONTROL CIRCUIT
• HOLDING MAGNET PARK LOCK SOLENOID (Park by wire) OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID B OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID C OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID D OR RELATED CONTROL CIRCUIT
• PRESSURE CONTROL SOLENOID E OR RELATED CONTROL CIRCUIT
• TRANSMISSION CONTROL MODULE (TCM)

1, Check battery for degradation …. Renew it if in doubt, looks like it may be 4+ years old.
2, Remove battery earth strap and chassis to gearbox earth strap and thoroughly clean both surfaces, refit and retest.

 

[BruneyC]

Thanks @Kengle fault now resolved.
There was a faulty valve pack in the auto transmission- very expensive repair as Fiat advised changing many expensive items first to eliminate inc the ECU.

 

[Kengle]

Thanks @Kengle fault now resolved.
There was a faulty valve pack in the auto transmission- very expensive repair as Fiat advised changing many expensive items first to eliminate inc the ECU.

Thanks for your reply….it certainly helps others to have as much feedback as possible, cheers.