TAIB-1006

MTM Solenoid Fault Codes and Vehicle Air System Contamination

Date: April 6, 2023

Updated: May 21, 2025

Issue Description:

Customers are reporting transmission service lamp on with one or more solenoid valve fault codes. During fault code isolation troubleshooting procedure no fault may be found and leads to Mechatronic Transmission Module (MTM) replacement.

During the MTM warranty return inspection process, engineering identified contamination in the MTM housing air inlet, passages, and internal components, and determined the source of contamination is from the vehicle air system.

MTM air passages and internal components contaminated by the vehicle air system results in sticking Rail Solenoid valves causing incomplete shifts and setting Active Rail Solenoid fault codes.

Fault Codes associated with vehicle air system contamination:

Fault CodeSPNDescriptionFMI
5965901Rail B Fore Solenoid (A5)7, 17, 31
597*5909Rail B Aft Solenoid (A1)7*, 17*, 31
6165902Rail C Fore Solenoid (C1)7, 14, 15, 17, 31
617**5910Rail C Aft Solenoid (B1)7, 14**, 15, 17, 31
6365903Rail D Fore Solenoid (C2)7, 14, 15, 17, 31
6374216Rail D Aft Solenoid (B3)7, 14, 15, 17, 31
7406145Rail B Operation7, 16, 17

* If Endurant XD or PACCAR TX-18 and Fault Code 597 SPN 5909 FMI 7 or 17 is set, contact Eaton Cummins Automated Transmission Technologies help line for further diagnostic instructions:

  • US and Canada: +1-800-826-4357
  • Mexico: +52-800-800-6801

**If Endurant HD or PACCAR TX-12 and Fault Code 617 SPN 5910 FMI 14 is set, go to troubleshooting guide TRTS0950 Fault Code 617 Fault Code Isolation Procedure.

Caution
Before removing the MTM, create a Service Activity Report (SAR) and select “Send to Eaton” (internet connection required) and ensure one or more Fault Code (table above) is present. If no associated Fault Code is present, this document does not apply. Filing a claim without an associated Fault Code present or without an SAR will result in a rejected warranty claim.

Containment/Corrective Action:

Effective immediately, MTM’s with solenoid valve fault codes (table above) with amber contamination, moisture, and / or carbon particulates from the vehicle air system found in the MTM inlet screen will be considered non-warrantable.

If an MTM inlet does not show contamination but has a suspected vehicle air system contamination fault code, warranty determination is pending and will be confirmed upon the return and inspection of the MTM.

Note: Do not remove the MTM Cover.

Refer to Vehicle Maintenance Recommendations regarding transmission vehicle air system requirements to ensure proper air supply and air quality to the transmission.

Affected Models/Population:

  • Endurant HD
  • PACCAR TX-12
  • Endurant XD / XD PRO
  • PACCAR TX-18 / TX-18 PRO

Field Strategy:

1. Key on engine off.

2. Connect ServiceRanger.

3. Create a Service Activity Report (SAR).

4. Select “Send to Eaton”.

5. Record the transmission fault codes, FMI’s, occurrences, and timestamps.

6. Compare SAR fault codes with fault codes in table - Issue Description:

  • If one or more SAR fault codes are in the table, go to Step 7.
    • If Endurant HD or PACCAR TX-12 and Fault Code 617 FMI 14 is set, go to troubleshooting guide TRTS0950 Fault Code 617 Isolation Procedure.
    • If Endurant XD or PACCAR TX-18 and Fault Code 597 FMI 7 or 17 is set, contact help line for further diagnostic instructions.
  • If other transmission related fault codes are set, go to TRTS0950 - Fault Code Isolation Procedure Index.

7. Refer to OEM and/or air system manufacturer guidelines and remove vehicle air system Air Dryer Cartridge.

8. Inspect and record condition of the cartridge and mounting surface for oil and/or debris and compare to Air Dryer Cartridge images below.

  • If no contamination is found, record findings in the warranty claim, go to Step 9.
  • If contamination is found, record findings in the warranty claim, go to Step 9.

Air Dryer Cartridge:

Contamination Indicated:

_Graphics/_Raster/TAIB1006_Contamination_Img1.jpg_Graphics/_Raster/TAIB1006_Contamination_Img2.jpg
_Graphics/_Raster/TAIB1006_AirDryerCartridge_Contamination.jpg_Graphics/_Raster/TAIB1006_AirDryerContamination_IMG2.jpg
_Graphics/_Raster/TAIB1006_AirDryerCartridge_ContaminationImg3.jpg

Air Dryer Cartridge (continued):

No Contamination Indicated:

_Graphics/_Raster/TAIB1006_AirCartridge_NoContamination1.jpg_Graphics/_Raster/TAIB1006_AirCartridge_NoContamination2.jpg

Note: Moisture (Water) droplets found on the cartridge base is normal.

9. Refer to OEM guidelines and remove the vehicle air supply line at the MTM.

10. Inspect vehicle air supply line and MTM air inlet port for contamination and compare MTM Air Inlet Port images below.

  • If no contamination is found at the MTM air inlet, recommend MTM replacement. Warranty determination is pending and will be confirmed upon the return and inspection of the MTM.
  • If contamination* is found, recommend MTM replacement - Non-Warrantable Repair.

    Note: Do not remove the MTM Cover.

Notice
*Eaton Cummins Automated Transmission Technologies recommends inspection and repair of the vehicle air system to correct the source of contamination. Refer to OEM and/or vehicle air system manufacturer maintenance guidelines to ensure proper air system operation, i.e. drain water from air tanks, replace air system filters and cartridges. Refer to Vehicle Maintenance Recommendations in transmission service manual.

MTM Air Inlet Port:

Vehicle air system contamination Indicated:

Amber Contamination and Moisture

Amber Contamination

_Graphics/_Raster/TAIB1006_MTMAirInlet_AmberContam_Moisture.jpg_Graphics/_Raster/TAIB1006_MTMAirInlet_AmberContamination.png

Moisture / Rust

Carbon Particles

_Graphics/_Raster/TAIB1006_MTMAirInlet_MoistureRust.png_Graphics/_Raster/TAIB1006_MTMAirInlet_Carbon.png

No contamination Indicated:

45 months in service

New

_Graphics/_Raster/TAIB1006_MTMAirInlet_45Month.png_Graphics/_Raster/TAIB1006_MTMAirInlet_New.png

Warranty Information:

Contamination from the vehicle’s air supply is not a warrantable repair and is considered secondary damage. Warranty covers defects in materials and/or workmanship. Reference Eaton Cummins Automated Transmission Technologies Warranty Manual ECWY3000.

  • Claim is submitted through normal Warranty channels.
  • Repairing customer / dealer to provide SAR verifying VIN, transmission serial number and fault codes.
Caution
Before performing service on the MTM, create a Service Activity Report (SAR) and select “Send to Eaton” (internet connection required) and ensure at least one of the associated Fault Codes are present. If no associated Fault Code is present, this document does not apply. Filing a claim without an associated Fault Code present or without an SAR will result in a rejected warranty claim.

Warranty Parts:

• If vehicle air system contamination is present - Non-Warrantable Repair.

  • Refer to OEM and repair/maintain vehicle air system
  • Recommend replacement of MTM
  • Refer to Vehicle Maintenance Recommendations

• If the MTM inlet does not show contamination but has a suspected vehicle air system contamination fault code, warranty determination is pending and will be confirmed upon the return and inspection of the MTM.

Warranty Labor (ECWY3000):

If no vehicle air system contamination is present:

  • Diagnostics (Up to 1.0 hour)
  • Air Dryer Inspection (Remove Cartridge / Up to 0.5 hour)
  • Transmission R&R (Up to 3.4 hours)
  • MTM R&R (Up to 1.2 hours)
  • Software Update and calibration/configuration (Up to 0.3 hour) *
    • *If required by the software level indicated in the Service Manual
  • Test Drive (Up to 0.3 hour)

Warrantable (Pending Inspection) General Claim Coding:

Line Item tab - Repair Line List

  • Primary Casual Part # Use MTM Assembly Number
  • Secondary Casual Part #: N/A
  • Complaint Code: Varies
  • Failure Mode Description: ROOT CAUSE UNDER INVESTIGATION - SUPPLIER (TFM-0517)
  • Responsibility Code:
    • RTW COMMITMENT (601) for RTW claims
    • Unknown (417) for all others

Non-Warrantable General Claim Coding:

  • Line Item tab - Repair Line List
    • Primary Casual Part # INTERFACE
    • Secondary Casual Part #: N/A
    • Complaint Code: Varies
    • Failure Mode Description: AIR SUPPLY CONTAMINATION (TFM-0043)
    • Responsibility Code: Rejected Claim (414)

Part Return Instructions:

Return all parts per Eaton Cummins Automated Transmission Technologies Warranty Manual ECWY3000

Warranty Coverage:

Reference Eaton Cummins Automated Transmission Technologies Warranty Manual ECWY3000.

_Graphics/_Raster/TAIB1006_ProcessFlow.png

Change Log

DateDescription
05/21/2025Updated Issue Description, Containment Corrective Action, Field Strategy, Warranty Sections and Process Flow.
05/09/2025Updated Field Strategy. Updated process flow.
03/03/2025Aligned SRT’s with ECWY3000.
02/04/2025Removed Clutch and Rail Calibration after Repair (OEM SRT up to 0.3 hour)
02/03/2025Updated Process Flow to review transmission snapshot data. Added Appendix.
01/08/2025OEM led change in transmission R&R from 4.9 hrs. to 3.4 hrs.
09/25/2024Added not under fault code table for FC 597.
03/18/2024Further clarification for step 12.
03/05/2024Added additional caution under fault codes. Added images for normal valve exhaust.
10/16/2023Updated Field Strategy section contamination inspection process, Inertia Brake component replacement decisions with black substance contamination and Warranty Parts section.
09/18/2023Added reference to TAIB-0994 to field strategy. Added Endurant XD / XD-PRO and PACCAR TX-18 / TX-18-PRO to the affected population. Added statement that moisture (water) droplets found within the air dryer base is normal.
09/11/2023Updated non-warrantable and warrantable images. Updated Step 14, 15 and related caution.
08/21/2023Moved air cartridge inspection before MTM air inlet inspection. Added images and identified as non-warrantable/warrantable. Updated Warranty Information section.
06/26/2023Added FMI 7 and 17 to fault code table, restructured contamination criteria, added contaminated air dryer pictures, and added air dryer inspection time.

The material contained in this bulletin is product improvement information. Eaton Corporation is not committed to, or liable for, canvassing existing products.

FSUD: 4512