Diagnostic Test

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

DETERMINING IF RELATED DTCS ARE PRESENT
1. With the scan tool, check for transmission DTCs
  Is DTC P0841 present?
  
  Yes
  - Refer to the DIAGNOSTIC CODE INDEX and perform the appropriate diagnostic procedure.
  No
  - Go To 2
CHECK TO SEE IF DTC P1776 IS CURRENT
1. With the scan tool, Check the Starts Since Set counter.
  NOTE:
  NOTE: This counter only applies to the last DTC set.
  
  Is the Starts Since Set counter 2 or less?
  
  Yes
  - Go To 3
  No
  - Go To 7
PCM AND WIRING
1. Turn the ignition OFF to the LOCK position.
2. Remove the Starter Relay.
  CAUTION:
  Removal of the Starter Relay will prevent the vehicle from being started in gear.
  
  WARNING:
  The Starter Relay must be removed from the PDC. Failure to do so may result in possible serious or fatal injury.
  
  NOTE:
  Failure to remove the Starter Relay can cause a Transmission - No Response condition.
3. Install the (special tool #8333B, Simulator, Transmission).
4. Ignition ON, Engine Not Running.
5. With the Transmission Simulator, turn the Pressure Switch selector switch to the L/R position.
6. With the scan tool, monitor the L/R Pressure Switch state while pressing the Pressure Switch Test button on the Transmission Simulator.
  Did the state of the L/R Pressure Switch change while pressing the Pressure Switch Test button?
  
  Yes
  - Go To 4
  No
  - Go To 5
SOLENOID SWITCH VALVE
1. Remove the Valve Body in accordance with the Service Information.
2. Inspect the Solenoid Switch Valve and Plugs for sticking in the bore and/or wear.
  Were any problems found?
  
  Yes
  - Clean and repair as necessary in accordance with the Service Information. Refer to VALVE BODY, REMOVAL .
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 7
L/R PRESSURE SWITCH SENSE CIRCUIT OPEN

Fig 1: Checking L/R Pressure Control Circuit For An Open
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition OFF to the LOCK position.
2. Disconnect the (special tool #8333B, Simulator, Transmission).
3. Disconnect the PCM C4 harness connector and connect the (special tool #8815A, Kit, NGC, 38 Position).
  NOTE:
  Note: Check connectors - Clean/repair as necessary.
  
  CAUTION:
  Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the Miller tool 8815A to perform diagnosis.
4. Measure the resistance of the (T50) L/R Pressure Switch Sense circuit between the appropriate terminal of the (special tool #8815A, Kit, NGC, 38 Position) to the Solenoid/TRS Assembly harness connector.
  Is the resistance above 5.0 ohms?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for an open.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Go To 6
(T50) L/R PRESSURE SWITCH SENSE CIRCUIT SHORTED TO GROUND

Fig 2: Checking L/R Pressure Switch Sense Circuit Shorted To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (T50) L/R Pressure Switch Sense circuit.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the (T50) L/R Pressure Switch Sense circuit for a short to ground.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM in accordance with the Service Information. With the scan tool, perform a Quick Learn. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL or MODULE, POWERTRAIN CONTROL, 6.7L DIESEL, REMOVAL .
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. This DTC can also be set by the Solenoid Switch Valve intermittently sticking in it's bore under extreme temperature conditions or by a worn Solenoid Switch Valve or Plugs.
5. With the scan tool, check the Event Data to help identify the conditions in which the DTC set.
  Where any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the 66RFE TRANSMISSION VERIFICATION TEST. Refer to 66RFE TRANSMISSION VERIFICATION TEST .
  No
  - Test Complete.