Eaton Fuller Hybrid Fault Code 11 – No TECU Operation

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. The Transmission Electronic Control Unit (TECU) is mounted to the transmission and contains all of the software to control the transmission; however, the hybrid Control Module (HCM) controls the operation of the TECU during hybrid operation.

Fault Code 11 – No TECU Operation 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.

Conditions to Set Fault Code Active

Conditions to Set Fault:
• FMI 12 is set if the TECU detects an intermittent failure in the Electronic Shifter position.

Fallback When Fault Code 11 is set the following conditions occur:
• Red “Service” light illuminates and an “F” flashes in the gear display (only if the fault occurs after power up).
• Fault is stored in TECU memory.
• If the fault code occurs after power up, the transmission remains in the current gear and the clutch opens.

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 12
    • Electric Shifter

Fault Code 11 – No TECU Operation Test

Component Identification:

NOTE: Refer to the Eaton Hybrid Component and Connector Location for Connector Locations in MY08 Systems

NOTE: Refer to the Eaton Hybrid Component and Connector Location for Connector Locations in MY09 Systems.

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

  1. Retrieve Active fault codes and FMIs with ServiceRanger using the 9-Way Diagnostic Connector:
    • If Fault Code 11 is Active, replace the Electric Shifter.
    • If Fault Code 11 is Inactive, test is complete.

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