MTM Solenoid Fault Codes and Vehicle Air System Contamination

Date: April 6, 2023

Updated: August 5, 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, 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.

* 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.

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 suspended vehicle air system contamination fault code, review snapshot data. If snapshot data reveals that a sticking valve is present, ECJV claim is denied. Refer to the OEM for air system warrantable guidelines.

Note: Snapshot data can be reviewed at the dealer or fleet level (see Appendix), or by contacting the Roadranger Call Center at 1-800-826-4357 and following the prompts for Endurant.

If snapshot data is not available or does not show evidence of a sticking valve, 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:

Air Dryer Cartridge (continued):

No Contamination Indicated:

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. Review snapshot data prior to sending MTM to Eaton for inspection. If snapshot data reveals that a sticking valve is present; claim is denied. If snapshot data does not show evidence is a sticking valve warranty determination is pending and will be confirmed upon the return and inspection of the MTM. See Appendix for pulling and plotting data via SR4.
• If contamination* is found, recommend MTM replacement - Non-Warrantable Repair.

  Note: Do not remove the MTM Cover.

MTM Air Inlet Port:

Vehicle air system contamination Indicated:

Amber Contamination and Moisture	Amber Contamination
Moisture / Rust	Carbon Particles

No contamination Indicated:

45 months in service	New

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.

Warranty Parts:

• If vehicle air system contamination is present or the snapshot data confirms a sticking valve - 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.

Appendix

Service Ranger 4 Report Home Screen

Click the "Viewing" Dropdown and Select "Snapshot"

Select "View" on the appropriate log.

Once Excel opens, select "Yes" is this box appears

Double click in between each column to expand so all text is visible

Scroll to the bottom of the Header information until "Table" is visible

Find the appropriate Channels, or data points for viewing. In this case, Rail C Position, and Rail C Position Command for Fault code 616 (SPN 5902) FMI 14 for Rail C Fore Solenoid.Click and drag from the top of the first channel to the bottom of the table data. (221 line for each Rail Position and Respective Rail Command)Hold Ctrl + Click and drag to the bottom of the second channel. This should leave both section in the table highlighted.

With both channels highlighted in the table, click "Insert" in the header

Click the line graph icon, and select the first option

A line graph will appear in the spreadsheet with the highlighted channels for data review.The data below is a typical example of a stuck Rail C aft solenoid failing to achieve the requested position commands

The data below indicates a stuck Rail C fore AND aft solenoid failing to achieve the requested position commands

Below is an example of a shift rail RESPONDING CORRECTLY to a position change request.

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

FSUD: 4512