Fault Code 215, Transmission Air Supply Pressure Sensor (TASPS) - Endurant HD, XD, PACCAR TX-12, TX-18

Date: August 8, 2024

Updated: February 20, 2026

Issue Description:

Customers may report transmission service lamp on with the following fault code information:

Note: This service bulletin only applies to the fault code, SPN and FMIs indicated above.

Affected Models/Population:

MTM Type PS-490, PS-496

Verify ServiceRanger Version:

1. Open ServiceRanger, vehicle connection is not required.

2. Go To Settings.

3. Select License.

4. Record ServiceRanger Version: 4.##.####

• If version is less than 4.12, go to RRMT-0041: ServiceRanger 4 Software Upgrade - Download and Install Procedure and update to latest version. Then go to Field Strategy.
• If version is equal to or greater than 4.12, go to Field Strategy.

Field Strategy:

Procedure A:

Create a Service Activity Report

• Key on.
• Connect ServiceRanger.
• Create a Service Activity Report.
• Select Send to Eaton (internet connection required).
• Go to Procedure B.
  • Identify MTM information with ServiceRanger or MTM Parts Label.

Procedure B - Identify MTM Type:

Identify MTM information with ServiceRanger:

• Select “Configuration”.
• Select “Advanced” and record MTM Type - Current Value:
• Compare MTM Type in table:

- or -

Identify MTM with MTM Parts Label:

1. Record MTM Part Number and Serial Number.

2. Compare MTM Part Number in table:

Procedure C - Confirm the vehicle air system is functioning properly:

• Key on with engine running.
• Allow vehicle air pressure to build to governor cut off.
• Monitor in-dash vehicle pressure gauge and record value in table.
  • If reading is out-of-range, refer to OEM guidelines and verify operation and maintenance of the vehicle air system; this service bulletin does not apply.
  • If reading is in-range, go to Step 4.
• Key on with engine running.
• Connect ServiceRanger.
• Go To “Data Monitor”.
• From the Default Parameter Files, select “Transmission Pressure” or “Transmission and Vehicle Air Supply Pressure”.
• In ServiceRanger, monitor 520524 - Line Pressure Feedback and record value (psi/kPa) in table.
• Compare reading in table.
  • If reading is constant and in-range, TASPS is properly reporting vehicle air pressure. The vehicle air system experienced a low air pressure event; this service bulletin does not apply. Do not replace the TASPS.
  • If reading is erratic and/or out of range, go to Procedure D.

Procedure D:

1. Based on OEM, determine next step.

• If OEM is International, Kenworth, Peterbilt or Volvo (Mack), go to Step 2.
• If OEM is Freightliner or Western Star, go to Procedure G.

2. Key on with engine off.

3. Connect ServiceRanger.

4. Go To Programming.

5. Under Hardware Information, record TCM part number:

• If TCM part number is equal to or greater than 10003852, go to Step 6.
• If TCM part number is less than 10003852, go to RRMT-0055: Transmission Air Supply Pressure Sensor (TASPS) Replacement Service Procedure - Endurant HD, XD and PACCAR TX-12, TX-18.

6. Under Software Information, record TCM software part number in table.

7. Compare the Transmission Model, OEM and TCM software part recorded in Step 6 with Software part number in table below.

• If TCM software part number is less than part number in table below, go to Step 8.
• If TCM software part number is equal to or greater than part number in table below and ServiceRanger indicates 215 FMI 10 and/or 21 - This indicates the TCM is using the reported air pressure information from other vehicle sources to verify sufficient air pressure is available for normal transmission operation. No further action is required. See Additional Information section.

8. Based on Transmission Model, determine next step.

• If Endurant HD or XD, go to Procedure E.
• If PACCAR TX-12 or TX-18, go to Procedure F.

Procedure E:

1. Compare the OEM in the table below and determine the Available Updates software package.

In the ServiceRanger Programming screen:

• From the Available Updates, select the software package.
• Select “Confirm” and follow on-screen prompts. Process complete.

Note: After the TCM software update, ServiceRanger may indicate 215 FMI 10 and/or 21. This indicates the TCM is using the reported air pressure information from other vehicle sources to verify sufficient air pressure is available for normal transmission operation. No further action is required. See Additional Information section.

Procedure F:

1. Update any necessary TCM parameter changes with DAVIE4 prior to updating TCM software with ServiceRanger.

2. Key on with engine off.

3. Connect ServiceRanger.

4. Go to Programming.

5. In the ServiceRanger Programming screen:

• From the Available Updates, select the software package in the table below.
• Select “Confirm” and follow on-screen prompts. Process complete.

*It is advised not to update the TCM using DAVIE4 after completing an update with ServiceRanger. Updating the TCM with DAVIE4 after using ServiceRanger may revert the software to an earlier version.

Note: After the TCM software update, ServiceRanger may indicate 215 FMI 10 and/or 21. This indicates the TCM is using the reported air pressure information from other vehicle sources to verify sufficient air pressure is available for normal transmission operation. No further action is required. See Additional Information section.

Procedure G:

1. Based on Transmission Model, determine next step.

• If model is -N (natural gas), go to Step 2.
• If model is not -N (natural gas), go to RRMT-0055: Transmission Air Supply Pressure Sensor (TASPS) Replacement Service Procedure - Endurant HD, XD and PACCAR TX-12, TX-18 and replace TASPS.

2. Key on with engine off.

3. Connect ServiceRanger.

4. Go To Programming.

5. Under Hardware Information, record TCM part number:

• If TCM part number is equal to or greater than 10003852, go to Step 6.
• If TCM part number is less than 10003852, go to RRMT-0055: Transmission Air Supply Pressure Sensor (TASPS) Replacement Service Procedure - Endurant HD, XD and PACCAR TX-12, TX-18 and replace TASPS.

6. Under Software Information, record TCM software part number in table.

• If TCM software part number is less than 5541082 (R6.3), go to Step 7.
• If TCM software part number is equal to or greater than 5541082 (R6.3) and ServiceRanger indicates 215 FMI 10 and/or 21 - This indicates the TCM is using the reported air pressure information from other vehicle sources to verify sufficient air pressure is available for normal transmission operation. No further action is required. See Additional Information section.

7. In the ServiceRanger Programming screen:

• From the Available Updates, select the software package.
• Select “Confirm” and follow on-screen prompts. Process complete.

Note: After the TCM software update, ServiceRanger may indicate 215 FMI 10 and/or 21. This indicates the TCM is using the reported air pressure information from other vehicle sources to verify sufficient air pressure is available for normal transmission operation. No further action is required. See Additional Information section.

Additional Information:

For MTM Type PS-496 equipped with TCM software version 5541082 or higher. FMIs 2, 10, and 21 may become active to indicate that the TCM is utilizing the vehicle-reported air pressure data to confirm sufficient air pressure is available for normal transmission operation. While this logic is being applied, the driver may observe a brief transmission low air message. FMI 1 and FMI 18 will continue to activate if the vehicle’s air supply pressure falls below the normal operating range: 75 PSI (517 kPa) for FMI 1 and 80 PSU (552 kPa) for FMI 18.

Driver Information:

This software is designed to maintain transmission operation and prevents a towing event when the TASPS reports an issue. Drivers may observe a brief air message, and the transmission may hold its current gear until vehicle-reported air pressure reaches 110 PSI (758 kPa). Please continue operating the vehicle and allow the air pressure to reach 110 PSI (758 kPa).

• If the TASPS reports an erratic or higher than expected rate of pressure change during initial startup or while driving, the TCM monitors vehicle-reported air supply pressure to ensure consistent and sufficient air pressure is available for normal transmission operation throughout the rest of the key cycle. FMI 2 or 10 is set active with no lamp.
• If the TASPS reports low air pressure at initial startup, the corresponding low air pressure sensor FMI 1 and 18 becomes active but will not broadcast until a gear selection is made by the driver. If the TASPS continues to indicate low pressure and vehicle-reported air supply pressure reaches 110 PSI (758 kPa), the TCM will open and close the clutch confirming sufficient air pressure is available for normal transmission operation throughout the rest of the key cycle. FMI 21 is set active with no lamp, and low air goes inactive.
• If the TASPS reports low air pressure while driving, the low air pressure sensor FMI 1 or 18 activates and may indicate a transmission low air message. The TCM maintains the current gear and monitors the vehicle-reported air supply pressure. When the pressure reaches 110 PSI (758 kPa), the TCM monitors the next downshift to ensure the clutch can successfully open and close confirming sufficient air pressure is available for normal transmission operation throughout the rest of the key cycle. FMI 21 is set active with no lamp, and low air goes inactive.

Warranty Information:

Warranty Parts:

• No parts

Warranty Labor (ECWY3000):

• TCM Software Update:
  • Diagnostics (Up to 1.0 hour)
  • Software Update (Up to 0.3 hour)
  • Verify Repair Road Test (Up to 0.3 hour)

General Claim Coding

TCM software update only:

- Line Item tab - Repair Line List

• Primary Casual Part #: 10005053 (SENSOR, AIR PRESSURE)
• Secondary Casual Part #: N/A
• Complaint Code: Varies
• Failure Mode Description: AIR PRESSURE SENSOR-APS-READING INCORRECT PRESSURE (TFM-0538)
• Responsibility Code:
  • RTW COMMITMENT (601) for RTW claims
  • Vendor Part (418) for all others
• Part Return Instructions: Per OEM or RTW Instructions

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

FSUD: 4552