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Home › GMC › 2025 › Sierra 1500 SLT, 6.2L Eng VIN L › Repair and Diagnosis › General Information › Reset Procedures › Programming And Setup - All Systems › Repair Instructions › K4 Assist Step Control Module: Programming and Setup › Unsuccessful Programming Recovery

Unsuccessful Programming Recovery

NOTE:
  • Ensure the EL-52100  (MDI 2) is used when programming the vehicle. Using the EL-47955 (MDI) will result in a programming failure.
  • It may be necessary to use another EL-52100  (MDI 2) and/or cables to verify proper operation to eliminate the possibility of faulty equipment.
  • If Ethernet programming fails, ensure there is no fault in the Ethernet circuits between the X84 Data Link Connector and K56 Serial Data Gateway Module.

In the event of an interrupted or unsuccessful programming event, perform the following steps:

  1. Exit Service Programming System (SPS) and disconnect all programming equipment from the vehicle.
  2. Disconnect all battery voltage or ignition voltage sources from the K4 Assist Step Control Module. All voltage sources must be removed for a minimum of 10 min. This can be done several ways and should be completed by using the least intrusive way. This can vary depending on vehicle and control module location and can be done by one of the options listed below:
    • Removing all fuses supplying battery voltage and ignition voltage to the control module.
    • Disconnecting all harness connectors from the control module.
    • Performing a 12 V battery disconnect by disconnecting the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Reconnect all battery voltage and ignition voltage sources to the K4 Assist Step Control Module.
  4. Close down the current session of Techline Connect and reopen a new session.
  5. Verify the K4 Assist Step Control Module, X84 Data Link Connector, and programming tool connections are secure and the tool software is up to date.
  6. Ignition/Vehicle OFF, ensure that the key fob is inside the vehicle and not moved for the duration of the programming to prevent an inadvertent power mode change during programming.
  7. Access the Service Programming System (SPS) and follow the on-screen instructions for the K4 Assist Step Control Module.
  8. Verify the K4 Assist Step Control Module can be programmed.
    • If the control module cannot be reprogrammed 
    1. Ignition OFF for one minute, ignition ON.
    2. Ignition ON/Vehicle OFF.
    3. Access SPS and follow the on-screen instructions for the K4 Assist Step Control Module.
      4. NOTE:

      If programming is still not successful after the second programming attempt, check the following:

      • For facilities using an internet firewall, ensure firewall settings are not blocking file downloads and/or require elevated rights.
      • For United States and Canada GM dealers, the appropriate firewall settings can be found in the GM DEALER INFRASTRUCTURE & SECURITY GUIDELINES (DISG) section 2.d.vii.
      • For optimal consistency during the reprogramming session, we recommend connecting the computer/laptop to a hardwired Ethernet cable, as the large software file size may affect stability.
    5. Verify the K4 Assist Step Control Module can be reprogrammed.
      • If the control module cannot be reprogrammed, replace the K4 Assist Step Control Module.
      • Go to next step: If the K4 Assist Step Control Module can be reprogrammed
    6. At the end of programming, choose the "Clear DTCs" function on the SPS screen.
    • Go to next step: If the control module can be reprogrammed 
  9. At the end of programming, choose the "Clear DTCs" function on the SPS screen.
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