Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Module Programming: Pcm
This procedure is required when one or more of the following situations are true:
- A Powertrain Control Module (PCM) has been replaced.
- Diagnostic Trouble Code (DTC) P1602 - PCM Not Programmed is set.
- An updated calibration or software release is available for either the PCM or Transmission Control Module (TCM).
This procedure assumes that the scan tool is properly configured to the dealership network with either a wired or wireless connection. For help on how to network the scan tool, use the "Help" tab at the top of the diagnostic application.
This 68 RFE 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.
Programming Procedure - Using the scan tool:
- Verify that the scan tool operating software is programmed with the latest software release.
- Flash the Powertrain Control Module (PCM).
- Clear all DTC's.
- From the "Home" screen, select "ECU View".
- Select "PCM".
- Select "Misc functions".
- Select "Check PCM VIN" and follow the on screen instructions. When complete, select "Finish".
- Navigate back to the home screen and select the Body Control Module (BCM).
- Select the "Misc Functions" menu.
- Run the "Immobilizer ECU Replace" routine.
- Key OFF ignition for a minimum of 60 seconds (1 minute) and then Key ON ignition for a minimum of 60 seconds (1 minute) after running the Immobilizer ECU replace routine.
- Enable the auxiliary fuel pump if the vehicle is equipped with dual fuel tanks. (6.7L Cummins Diesel only).
- Perform the "Brake Pedal Learn" procedure as follows:
- Park the vehicle on level ground.NOTE:
When performing the Brake Pedal Calibration Learn routine, make sure the brake pedal is NOT pressed.
- Park the vehicle on level ground.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.