Diagnostic Test

WARNING: This page is about a different car, the 2019 RAM 3500 HD and 2019 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM SHIFT LEVER POSITION TEST
1. With the scan tool, perform a Shift Lever Position test. Follow the instructions on the scan tool.
  Did the Shift Lever Position Test pass?
  
  Yes
  - Go To 2
  No
  - Perform the appropriate diagnostic procedure. Refer to DIAGNOSTIC CODE INDEX .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
CHECK IF DTC P0944 IS ACTIVE
1. Place the gear selector in Park.
2. Start the engine.
3. The transmission must be at operating temperature prior to checking pressure. A cold transmission will give higher readings.
4. Run the engine at 1500 RPM.
5. With the scan tool, monitor the Transmission Line Pressure.
  Does the (actual) Line Pressure match the Desired Line Pressure within ± 34 kPa (5 psi)?
  
  No
  - Go To 6
  Yes
  - Go To 3
CHECK LINE PRESSURE IN DRIVE AND REVERSE
1. Firmly apply the brake and repeat the previous test in both Drive and the Reverse gear positions.
2. With the scan tool, monitor the Transmission Line Pressure.
  Does the Line Pressure match the Desired Line Pressure within ± 5 psi in all gear ranges?
  
  Yes
  - Go To 4
  No
  - Go To 5
REVIEW CUSTOMER COMMENTS
1. The conditions necessary to set this DTC are not present at this time.
2. Verify with the customer if a delayed engagement and/or an intermittent "No Drive" condition has occurred.
3. If the customers answer is "No" erase the DTC and return the vehicle to the customer.
4. Make sure to check for any TSBs or controller flash updates that my apply.
5. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.
  Has the customer experienced any delayed engagement and/or "No Drive" conditions?
  
  Yes
  - Go To 6
  No
  - Test Complete.
DTC VERIFICATION
1. Read and record the DTC and the Event Data information.
2. Test drive the vehicle and attempt to operate the vehicle within the parameters in which the DTC set.
3. With the scan tool, read DTCs.
  Did any following DTCs set, P0868, P0944, P0841, P0846, P0871, P0876, or P0988?
  
  Yes
  - Go To 6
  No
  - Test Complete.
CHECK TRANSMISSION PRIMARY OIL FILTER
1. Remove and inspect the Transmission Oil Pan in accordance with the Service Information.
2. Remove and inspect the Primary Oil Filter in accordance with the Service Information.
3. Inspect the oil filter seal for damage and proper installation.
  Does the Oil Pan contain excessive debris, or is the oil filter plugged, loose, or damaged?
  
  Yes
  
  NOTE:
  This transmission is equipped with a solenoid for the Torque Converter Clutch (TCC) that is a Variable Force Solenoid (VFS) with close tolerance Pressure/Inductance (PI) curve. It is necessary to update the TCC solenoid PI data in the PCM when replacing the TCC solenoid, Valve Body or Transmission assembly. This is done with the scan tool using the "Program Torque Converter Solenoid PI Curve" routine. The PI data is located on a 2-D BAR code etched on the body of the TCC solenoid. The data must be entered into the scan tool in order to upload the information to the PCM.
  
  When replacing the TCC solenoid or Valve Body, obtain the PI data before installing the transmission oil pan. When replacing the transmission, the PI data can be obtained from a 2-D bar code on the exterior of the new transmission. Early build transmissions will have the 2-D barcode label on the right side of the transmission case. Late build transmissions will have the label attached to a machined pad at the top of the case, near the rear of the transmission. If it is suspected that the valve body or TCC VFS has been replaced without uploading the correct PI data into the PCM, the transmission oil pan must be removed to retrieve the information from the 2-D bar code on the body of the TCC solenoid.
  - Repair the cause of the plugged transmission oil filter or excessive debris. Check the Transmission Oil Filter seal for improper installation onto filter neck instead of into the pump bore, not fully seated against pump housing, filter neck not engaged into pump. Check that the spin-on cooler return filter (if equipped) is not loose, and that its gasket is in good condition and properly seated. Repair as necessary.
  - If the Valve Body or the TCC VFS solenoid is replaced, remove the external TCC VFS bar code label from the transmission case.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .
  No
  - Repair the Transmission Oil Pump as necessary. Check for a stuck main regulator valve and clean if necessary. Refer to the Service Information for the proper repair procedure.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to TRANSMISSION VERIFICATION TEST .