Endurant XD
TRTS0960 EN-US
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December 2024 - D

Fault Code 105: Battery Voltage2

J1939: SA 3 SPN 444 FMI 0, 1, 4, 17, 18

Overview

The Transmission Control Module (TCM) requires a battery power and ground supply. The TCM has redundant power and ground sources (Battery Voltage1 and Battery Voltage2) that maintain normal function if either source becomes unavailable. The Battery Voltage2 wiring connects to the TCM through the 20-Way TCM Vehicle Harness Connector.

Detection

The TCM monitors Battery Voltage2 power and ground source. If the voltage is out of range, the fault is set Active.

Conditions to Set Fault Code Active

FMI 0 – Data Valid But Above Normal (Most Severe): Battery Voltage2 greater than 16.5 volts for 5 seconds.

FMI 1 – Data Valid But Below Normal (Most Severe): Battery Voltage2 less than 8 volts for 1 second.

FMI 4 – Voltage Below Normal or Shorted Low: Battery Voltage2 less than 4 volts during power up.

FMI 17 – Data Valid But Below Normal (Least Severe): Battery Voltage2 less than 11 volts for 5 seconds with engine above 1000 RPM.

FMI 18 – Data Valid But Below Normal (Moderately Severe): Battery Voltage2 less than 10.2 volts for 1 second with engine above 550 RPM.

Fallback

FMI 0:

  • No degraded modes

FMI 1, 4, 17, 18:

  • Amber warning lamp on
  • No degraded modes

Conditions to Set Fault Code Inactive

FMI 0, 1, 17, 18: Battery Voltage2 in range for 10 seconds.

FMI 4: Key cycle and fault condition no longer exist.

Possible Causes

FMI 0:

  • Vehicle jump-started
  • Vehicle charging/battery system failure

FMI 1, 4, 17, 18:

  • Vehicle Harness - Battery Power Supply
    • Wiring shorted to power, shorted to ground or open
    • Terminals bent, spread, corroded, or loose
  • Vehicle charging/battery system failure

Note: Refer to OEM for troubleshooting a failed system.

Additional Tools

  • Endurant XD Service Manual TRSM0960
  • Digital Volt Ohm Meter (DVOM)

Component Identification

_Graphics/LineArt/TRTS0960_FC100_ComponentID.png

1. 20-Way TCM Vehicle Harness Connector

2. Transmission Control Module (TCM)

_Graphics/LineArt/TRTS0950_FC105_WiringID.png

1. Transmission Control Module (TCM)

2. 20-Way TCM Vehicle Harness Connector

3. In-line Fuse Holder Battery Voltage2

4. 15-amp Fuse Battery Voltage2

_Graphics/LineArt/TRTS0950_Wiring-Key.png

Fault Code 105 Troubleshooting

A
Purpose:Check for Active or Inactive fault codes.

  1. Set vehicle parking brake and chock wheels.

  2. Record transmission fault codes, FMIs, occurrences, and timestamps from Service Activity Report created during the Diagnostic Procedure.

  • If Fault Code 105 is Inactive and there are other Active vehicle or transmission fault codes, troubleshoot all Active fault codes. Go to Step V

  • If Fault Code 105 FMI 0 is Active, Go to Step G

  • If Fault Code 105 FMI 0 is Inactive, the TCM experienced an over-voltage condition. Vehicle may have been jump-started or vehicle charging/battery system is failing. Refer to OEM guidelines for repair or replacement of vehicle charging/battery system. Go to Step V

  • If Fault Code 105 FMI 1, 17, 18 is Active, Go to Step C

  • If Fault Code 105 FMI 1, 17, 18 is Inactive, Go to Step B

  • If Fault Code 105 FMI 4 is Active or Inactive, create a Service Activity Report, select "Send to Eaton" and contact Eaton Cummins Automated Transmission Technologies at +1 800-826-4357 for further diagnostic instructions. Go to Step V

B
Purpose:Use Product Diagnostic (PD) Test to locate intermittent failures.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To “Service Routines”.

  4. Start “Product Diagnostic Test” and follow on-screen prompts.

    Note: Solid “PD” may appear in display when PD Test is active.

    Note: TCM will not enter PD Test mode when there are Active fault codes.

    _Graphics/LineArt/PD_GearDisplay.png

  5. Wiggle vehicle harness and connections between charging/battery system and 20-Way TCM Vehicle Connector. Check for signs of rubbing or chafing on wires. Refer to OEM wiring diagrams.

  6. To end test, press Stop button.

  • If fault codes set Active, refer to OEM guidelines for repair or replacement of vehicle harness and/or 20-Way TCM Vehicle Harness Connector. Go to Step V

  • If no fault codes become Active, Go to Step C

C
Purpose:Verify Battery Voltage2 supply to TCM.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To “Data Monitor”.

  4. From "Default Parameter Files" tab select “Transmission Supplied Voltages”.

  5. Monitor 168 - "Battery voltage" value. Record reading in table.

  6. Monitor 444 - "Battery 2 voltage" value. Record reading in table.

  7. Compare reading(s) in table.

  • If readings are out of range, Go to Step D

  • If readings are in range and no fault was found, the intermittent nature of the fault makes it likely there is a wiring problem between the vehicle charging/battery system and 20-Way TCM Vehicle Connector. Refer to OEM guidelines for repair or replacement of vehicle harness and/or 20-Way TCM Vehicle Harness Connector. Go to Step V

ParameterRangeReadings
168 - Battery voltage11-15V
444 - Battery 2 voltage 11-15V
D
Purpose:Verify condition of charging/battery system, fuse, power and ground supplies to TCM.

  1. Key off.

  2. Inspect vehicle charging/battery system and fuses, verify connectors are free from contamination and corrosion; terminals are not bent, spread or loose; and there is no damage to connector bodies.

  • If no fault found, Go to Step E

  • If fault found, refer to OEM guidelines for repair or replacement of vehicle charging/battery system. Go to Step V

    Note: Some chassis use a power distribution system separate from batteries, inspect all connections.

E
Purpose:Verify 20-Way TCM Vehicle Harness Connector condition.

  1. Key off.

  2. Disconnect 20-Way TCM Vehicle Harness Connector from TCM.

  3. Inspect 20-Way TCM Vehicle Harness Connector, verify connector is free from contamination and corrosion; terminals are not bent, spread or loose; and there is no damage to connector body.

  4. Inspect 20-Way TCM Vehicle Connector, verify connector is free from contamination and corrosion; terminals are not bent, spread or loose; and there is no damage to connector body.

  • If contamination or damage is found, refer to OEM guidelines for repair or replacement of 20-Way TCM Vehicle Harness Connector. Go to Step V

  • If no contamination or damage is found, Go to Step F

F
Purpose:Verify Battery Voltage2 at 20-Way TCM Vehicle Harness Connector.

  1. Key off.

  2. Measure voltage between 20-Way TCM Vehicle Harness Connector Pin 15 (-) and Pin 16 (+). Record reading in table.

    _Graphics/LineArt/TRTS0950_FC105_VPin15and16.png

  3. Compare reading(s) in table.

  • If readings are out of range, refer to OEM guidelines for repair or replacement of the vehicle charging/battery system, vehicle harness and/or 20-Way TCM Vehicle Harness Connector. Go to Step V

  • If readings are in range and no fault was found, the intermittent nature of the fault makes it likely there is a wiring problem between the vehicle charging/battery system and 20-Way TCM Vehicle Connector. Refer to OEM guidelines for repair or replacement of vehicle harness and/or 20-Way TCM Vehicle Harness Connector. Go to Step V

PinsRangeReading(s)
15 to 1611–15 V
G
Purpose:Verify Battery Voltage2 supply to TCM.

  1. Key on with engine off.

  2. Connect ServiceRanger.

  3. Go To “Data Monitor.”

  4. From "Default Parameter Files" tab select “Transmission Supplied Voltages”.

  5. Monitor 168 - "Battery voltage" value. Record reading in table.

  6. Monitor 444 - "Battery 2 voltage" value. Record reading in table.

  7. Key on with engine running.

  8. Monitor 168 - "Battery voltage" value. Record reading in table.

  9. Monitor 444 - "Battery 2 voltage" value. Record reading in table.

  10. Compare reading(s) in table.

  • If readings are out of range, refer to OEM guidelines for repair or replacement of the vehicle charging/battery system. Go to Step V

  • If readings are in range and Fault Code 105 FMI 0 is Inactive, vehicle may have been jump-started or the intermittent nature of the fault makes it likely that the problem is in the vehicle charging/battery system. Refer to OEM guidelines for diagnosing vehicle charging/battery system. Go to Step V

  • If readings are in range and Fault Code 105 FMI 0 is Active, replace Transmission Control Module (TCM). Go to Step V

    Note: If troubleshooting indicates no fault found in wiring or connections to TCM, ensure an intermittent issue does not exist in wiring or connections before replacing TCM.

ConditionParameterRangeReading(s)
Key on with engine off168 - Battery voltage 11–13V
Key on with engine off444 - Battery 2 voltage 11–13V
Key on with engine running168 - Battery voltage 13–15V
Key on with engine running444 - Battery 2 voltage 13–15V
V
Purpose:Verify repair.

  1. Key off.

  2. Reconnect all connectors and verify all components are properly installed.

  3. Key on with engine off.

  4. Connect ServiceRanger.

  5. Go To “Fault Codes”.

  6. Select “Clear All Faults”.

  7. Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.

  8. Check for fault codes using ServiceRanger.