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Home >> Jeep >> 2020 >> Grand Cherokee Trackhawk >> Repair and Diagnosis >> External Pages >> Different car >> Section 272 (68RFE Automatic Transmission - DTCS P0218-00 To P0871-00 - 2500HD & 3500HD) >> DTC Troubleshooting >> P0732-00-Gear Ratio Error In 2ND >> Diagnostic Test

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.
  1. CHECK FOR RELATED DTCS 
    1. With the scan tool, check for other transmission DTCs.

      Are there any Transmission line pressure, speed sensor, and/or loss of prime DTCs present?

      Yes 

      • Is the only related DTC present P0933-00? If yes, go to  2
      • If any of these DTCs are present, they may cause a Speed Ratio Error. Perform the test for P0944-00 first if it is present. and perform the appropriate diagnostic procedure. Refer to DIAGNOSTIC CODE INDEX .

      No 

      • Go To  2
  2. CHECK IF DTC IS CURRENT 
    1. With the scan tool, read and record the Event Data.
      NOTE:

      Make sure to record all Event Data stored in the scan tool for future reference in this test procedure.

      Does the Event Data display information for the DTC P0732-00?

      Yes 

      • Go To  4

      No 

      • Go To  3
  3. CHECK THE EVENT DATA 
    1. In the Event Data, identify the DTC that was recorded earlier.

      In the Event Data recorded earlier, does the Event Data display information for the DTC P1790-00, with target gear = 2nd, or with both 2C and UD clutches applying?

      Yes 

      • Go To  4

      No 

      • Go To  7
  4. CHECK INPUT SHAFT RPM IN EVENT DATA 
    1. Refer to the Event Data recorded earlier.

      In the Event Data recorded earlier, does the Input Shaft Speed RPM read zero?

      Yes 

      • Check the Input Speed Sensor and wiring. Refer to test P0716-00 and diagnose as if the DTC is current. Refer to DIAGNOSTIC CODE INDEX .

      No 

      • Go To  5
  5. CHECK LINE PRESSURE READING 

    In the Event Data recorded earlier, is the line pressure reading more than 10 psi below the desired line pressure?

    Yes 

    • Go To  6

    No 

    • Go To  7
  6. CHECK TRANSMISSION OIL FILTER 
    1. Turn the ignition off.
    2. Remove and inspect the Transmission Oil Pan for excessive debris in accordance with the Service Information.
    3. Remove and inspect the Primary Oil Filter in accordance with the Service Information.
      NOTE:

      Make sure the Primary Transmission Oil Filter and seal are properly installed and are not cracked or split.

      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.

      Does the Oil Pan contain excessive debris and/or is the Primary Oil Filter cracked, plugged or mis-installed?

      Yes 

      • Repair the plugged, cracked, or split Primary Transmission Oil Filter and/or seal. If excessive clutch debris is present, check the clutches for damage. Refer to the Service Information for the proper hydraulic clutch repair procedure.
      • 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 

      • Remove the Transmission Oil Pump in accordance with the Service Information. Check the main Regulator Valve for sticking in its bore, scoring, and/or damage and clean and repair as necessary. If no problem is found, replace the Transmission Solenoid/TRS Assembly.
      • 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 .
  7. CHECK IF THE DTC P0732-00 IS ACTIVE 
    1. With the scan tool, perform the 2nd Gear Clutch Test. Follow the instructions on the scan tool.
    2. Increase the throttle angle, TPS Degree, to 30° for no more than a few seconds.
      CAUTION:

      Do not overheat the transmission.

      NOTE:

      If the 2C clutch is faulty, the overrunning clutch will hold and the slip test will pass. The 2nd gear clutch test will not detect a faulty 2C clutch. However, it will detect a faulty UD clutch.

      Did the clutch test pass, did the Input Speed remain at zero?

      Yes 

      • Go To  8

      No 

      • Go To  10
  8. CHECK FOR INTERMITTENT OPERATION 
    1. Check the Shifter adjustment in accordance with the Service Information. Refer to CABLE, SHIFT, ADJUSTMENTS .
      NOTE:

      Intermittent gear ratio DTCs can set by problems in the Input and Output Speed Sensor circuits and/or Speed Sensor Ground circuit.

    2. Check the Speed Sensor wiring and connectors for good connection.

      Were any problems found?

      Yes 

      No 

      • Go To  9
  9. CHECK FOR SLIPPAGE 
    1. With the scan tool, erase Transmission DTCs.
    2. Road test the vehicle.

      Does the Transmission fail to make a 1-2 upshift (stays in 1st gear and then shifts to direct gear), or is there obvious slippage noticed in 2nd gear?

      Yes 

      • Go To  12

      No 

      • Go To  16
  10. CHECK THE UD HYDRAULIC CLUTCH CIRCUIT 
    1. Remove Transmission Oil Pan and check for excessive debris.
    2. Remove the Valve Body and air check the UD hydraulic clutch circuit (in the case) in accordance with the Service Information.
      NOTE:

      The UD clutch passage contains a small bleed orifice, a small amount of air leakage is normal.

      Were there any problems found, excessive debris and/or excessive air leakage in the UD clutch hydraulic circuit?

      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 as necessary. Check the UD clutch piston seals, reaction shaft support seal rings and the dribbler assembly, and the flatness of the pump valve body and pump housing faces. Check main regulator valve for sticking in the bore.
        NOTE:

        If the UD clutch has failed but no obvious cause is found (such as a cut piston seal, broken seal ring, low line pressure in Event Data, or any other items listed above) replace the Transmission Solenoid/TRS Assembly in addition to any necessary internal repairs.

      • 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 

      • Go To  11
  11. CHECK THE UD ACCUMULATOR PISTON 
    1. Check the UD bleed orifice, accumulator piston, and accumulator piston seal in the main valve body.

      Were there any problems found?

      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 as necessary. Refer to the Service Information for proper repair procedures.
      • 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 

  12. CHECK FOR EXCESSIVE DEBRIS 
    1. Remove the Transmission Oil Pan and check for excessive debris.
    2. If grey sludge is present, check for a improperly assembled 2C clutch with the thick reaction plate not against the case.
    3. Remove the valve body and air check the 2C hydraulic clutch circuit (in the 2C/4C clutch retainer) in accordance with the Service Information.
      NOTE:

      The 2C clutch passage contains a small bleed orifice, a small amount of air leakage is normal.

      Were there any problems found, excessive debris, improperly assembled 2C clutch and/or excessive air leakage in the 2C hydraulic clutch circuit?

      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 as necessary. Refer to the Service Information for proper repair procedures. Note: Check the 2C piston seals and bleed orifice.
        NOTE:

        If the 2C clutch has failed but no obvious cause is found (such as a cut piston seal, cut tower seal, stuck regulator valve, etc.) replace the Transmission Solenoid/TRS Assembly in addition to any necessary internal repairs.

      • 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 

      • Go To  13
  13. CHECK THE 2C ACCUMULATOR 
    1. Check the 2C Accumulator piston for cracks or a cut seal.
    2. Check for a cut or missing No. 5 check ball.
    3. Check the Solenoid Switch Valve and its plugs for sticking in its bore or excessive wear.

      Were there any problems found

      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 as necessary. Refer to the Service Information for proper repair procedures.
      • 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 

      • Go To  14
  14. CHECK FOR FAILED REVERSE GEARSET SPLINES 
    1. Working through the windows in the bottom of the case, check for a failed Reverse Sun or Annulus spline as follows:
      1. Hold the Transmission Output Shaft by holding the Transmission Manual Lever in the park position.
      2. Apply the 4C clutch using 30-40 psi shop air at the apply port in the center bulkhead.
      3. Attempt to rotate the input annulus gear and drive shell (the drum that encloses the two rearmost gearsets).
      NOTE:

      Due to the overrunning clutch, the gear and drive shell normally rotates in one direction only.

      Can the drive shell be rotated?

      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 internal transmission as necessary in accordance with the Service Information. Check the reverse annulus gear spline to the input carrier, and the reverse sun gear spline to the reaction carrier hub.
      • 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 

      • Go To  15
  15. CHECK THE DRIVE SHELL WELD 
    1. Release the output shaft and the 4C clutch.
    2. Apply the L/R Clutch only using 30-40 psi of shop air.
    3. Attempt to rotate the drive shell as in the previous step.

      Can the drive shell be rotated?

      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 Transmission as necessary in accordance with the Service Information. Check the drive shell weld to input annulus gear.
      • 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 

  16. CHECK IF DTC RESETS 

    Did the DTC P0732-00 reset during the road test?

    Yes 

    • Go To  17

    No 

    • Go To  18
  17. LIST OF POSSIBLE CAUSES 
    1. If any other DTCs set during the road test, refer to the appropriate symptom in the Transmission diagnostic information.
    2. If no other DTCs set during the road test, below is a list of possible causes, but not strictly limited to those:
      • Check for excessive debris in the Transmission Oil pan, plugged, cracked, or misinstalled Primary Transmission Oil Filter and/or seal.
      • Check for cut and/or missing No. 7 check ball in the main valve body.
      • Check the 2C and UD accumulator pistons and seals, UD bleed orifice, and the Solenoid Switch Valve and Plugs in the main valve body.
      • Check the UD clutch piston seals, reaction shaft support seal rings and dribbler assembly.
      • Check the 2C clutch piston seals, and bleed orifice.
      • Check the main regulator valve for sticking in its bore and the flatness of the pump valve body and pump housing faces.
      • Check for a improperly assembled 2C clutch with the thick reaction plate not against the case.

      Repair 

      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 as necessary. Refer to the Service Information for proper repair procedures.
        NOTE:

        If the UD or 2C clutch has failed but no obvious cause is found (such as a cut piston seal, broken seal ring, stuck regulator valve or any other items listed above) replace the Transmission Solenoid/TRS Assembly in addition to any necessary internal repairs.

      • 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 .
  18. INTERMITTENT DTC 
    1. The conditions to set this DTC are not currently present.
    2. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.
      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. If replacing the PCM, it is necessary to transfer the PI data from the old PCM to the new PCM using the scan tool. If the PCM being replaced is non-responsive, the PI data can be retrieved from a 2-D bar code on the exterior of the transmission case. This is done with the scan tool using the "Program Torque Converter Solenoid PI Curve" routine.

      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. The data must be entered into the scan tool in order to upload the information to the PCM. In the event that the exterior BAR code is missing, or it is suspected that the valve body or TCC solenoid has been replaced without uploading the correct PI data into an existing 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.

      • If the Event Data shows DTC P0732 set in Park, Reverse or Neutral, replace the Powertrain Control Module in accordance with the Service Information. Refer to REMOVAL AND INSTALLATION .
      • If the Event Data shows DTC P0732 set with input RPM = zero, check the input speed sensor and related wiring.
        • 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.

      • If the Event Data shows DTC P0732 set with line pressure significantly below desired line pressure, check for the cause of low line pressure (i.e. oil level, misinstalled or damaged primary filter or filter seal, sticking main regulator valve in pump, etc.).
      • If the Valve Body or the TCC VFS solenoid is replaced, remove the external TCC VFS bar code label from the transmission case.
      • If the Event Data shows DTC P0732-00 set with the UD or 2C pressure switch open (but line pressure matches Desired Line Pressure), air check the UD and 2C hydraulic clutch circuits for leakage in accordance with the Service Information. If the UD and 2C hydraulic clutch circuits are OK, replace the Transmission Solenoid/TRS assembly in accordance with the Service Information.
    3. Check the gearshift linkage adjustment.
    4. Intermittent Gear Ratio DTCs can be set by problems in the Input and Output Speed Sensor circuits and/or Speed Sensor Ground circuit.
    5. Wiggle wiring and connectors while checking for intermittent operation.
    6. Gear ratio DTCs can be set under extreme temperature conditions, verify if the problem is only experienced under extreme hot or cold conditions

      Were any problems found.

      Yes 

      No 

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