Eaton Fuller Hybrid Transmission Fault Code 75 – Power Down in Gear

Fault code for Eaton Hybrid Drive Systems models (MY08) EH-8E306A-U, EH-8E306A-UPG, EH-8E306A-UP, EH-8E306A-CD, EH-8E306A-T, EH-6E606B-CD, (MY09) EH-8E406A-U/P, EH-8E406A-UP, EH-8E406A-UPG, EH-8E406A-CD, EH-8E406A-CDG, EH-8E406A-CDR, EH-8E406A-T, EH-6E706B-CD, EH-6E706B-P and EH-6E706B-UPG. Read below to learn how to test, clear and fix fault code errors for your Freightliner, Mack, Peterbilt, Kenworth, Volvo, International, and heavy-duty truck and equipment. The Push Button Shift Control (PBSC) is connected to the Transmission Electronic Control Unit (TECU) over the High Integrity Link (HIL) to communicate driver mode selection and fault status. At power down the PBSC should be placed in “N” to perform the proper calibration sequence and to prevent a torque locked transmission.

Fault Code 75 – Power Down in Gear Detection

The following preconditions must be met before the system detects the fault:

  • TECU ignition voltage is greater than 7 volts and less than 16 volts.
  • PBSC ignition voltage is greater than 7 volts and less than 16 volts.

Note: When troubleshooting an Inactive code refer to the Product Diagnostic Mode (PDM)

Conditions to Set Fault Code Active

  • FMI 14 is set when the TECU goes into the power-down sequence and a drive mode selection other than “N” is confirmed.

Fallback When Fault Code 75 is set the following conditions occur:

  • Fault is stored in TECU memory only as an Inactive fault, since it only sets during the power-down sequence.

Conditions to Set Fault Code Inactive

Only Inactive faults can be cleared from the Transmission Electronic Control Unit (TECU) or HCM history using ServiceRanger. The TECU automatically clears the faults from history after 200 hours and the HCM automatically clears the faults from history after the fault has been Inactive for 200 hours.

This fault code can be caused by any of the following:

  • FMI 14: Driver powered down in non-neutral mode

Fault Code 75 – Power Down in Gear Test

STEP 1. Check for Active and Inactive fault code status.

  1. Retrieve Active fault codes and FMIs with ServiceRanger using the 9-Way Diagnostic Connector or manually.
  2. Key on.
  3. Retrieve Code.
    • If Fault Code 75 is Inactive, no action necessary. This code indicates the driver powered down the system prior to selecting neutral.
    • Explain to driver, “N” must be selected on the Push Button Shift Control before powering down to prevent a stuck in gear situation and/or a power up no crank situation.

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