Updated: May 11, 2021

Issue Description:

Customers may experience a low transmission air pressure and/or clutch temperature message during low speed maneuvering or stop and go traffic situations.

• Low Transmission Air Pressure Message: This issue may be induced by a vehicle air system not functioning properly resulting in the inability to achieve or maintain operating air pressure. Low air pressure may be induced by excessive use or cycling of the service brake, exhausting the vehicle air supply.
• Clutch Temperature Message: This issue may be induced by “two-footing” the service brake and accelerator pedal simultaneously causing the clutch not to fully close, inducing a clutch slip and increasing clutch temperature

Fault codes that may set during these events:

• Transmission Air Supply Pressure: FC215 SPN 37 FMI 18
• Clutch Temperature: FC815 SPN5939 FMI 15 and/or 16

Containment/Corrective Action:

Driver Recommendations:

• Ensure the vehicle air system is operating per OEM requirements.
• Allow the vehicle air system to reach the normal operating range, 99 (106 at the Air Brake Tanks for Navistar) to 130 PSI (6.8 to 9.0 Bar), prior to selecting a gear from neutral.
• Avoid “two-footing” the service brake and accelerator pedal.
• Avoid using the accelerator pedal to hold the vehicle on a hill - depress and hold the service brake until movement is required.
• During operation on a grade, rely on Hill Start Aid (HSA) when transitioning from the service brake pedal to the accelerator pedal.
• During low-speed maneuvering, select the lowest available start gear (1st or R1) and rely on Urge to Move and Creep Mode to assist in moving the vehicle at engine idle without having to apply the accelerator pedal.

Note: For additional information on how to operate the transmission refer to Endurant Driver Instructions TRDR0950 and GET 2 KNOW videos (http://videos.eatoncumminsjv.com/category/videos/get-2-know).

Recommendations when messages are displayed:

• Low Transmission Air Message: Allow the vehicle air system to reach normal operating range (100 PSI or above / 106 at the Air Brake Tanks for Navistar) and then continue operation. For optimal performance, the transmission re quires 99 to 130 PSI (6.8 to 9.0 Bar).

  Note: Transmission software version 5516024 includes enhancements that prevent Fault Code 215 from setting while transmission is in Neutral mode.

  • Non-Navistar Chassis: With software version 5516024 and above, if the driver attempts to select a non-neutral mode before transmission air pressure reaches 80 PSI, the transmission will prevent gear engagement and Fault Code 215 will set Active.
  • Navistar Chassis: At initial key on with software version 5516024 and above, if a driver attempts to select a non-neutral mode before transmission air pressure reaches 90 PSI, and the air brake tanks reach 106 PSI, the transmission will prevent gear engagement. The 106 PSI minimum on a Navistar chassis matches the tractor protection valve (OEM Requirement). If chassis air pressure falls below 106 PSI (Key on normal operation) the transmission will continue to shift until a minimum of 75 PSI is reached (see item A / Degraded Performance).

Note: Transmission and Air Brake Tanks can be monitored in SR4 / Data Monitor

• Clutch temperature message - Safely and immediately discontinue the operation that is being performed which is causing the clutch to overheat. Depress and hold the service brake or set vehicle parking brake and idle the engine until the message is no longer indicated and then continue normal operation. Ensure the engine is allowed to idle, shutting off the engine prolongs the condition.

  Note: Transmission software version 5516024 includes enhancements that allow the transmission to continue operation when Fault Code 815 sets. Fallback mode of the Fault Code will still disable some transmission functionality such as launching in a higher start gear and Urge to Move. The driver will continue to be notified of a Clutch Abuse event via a dash message and audible tone. A software update to 5516024 for Fault Code 815 is considered a non-warrantable issue.

Note: If the transmission low air and/or clutch temperature condition no longer exists, some OEM displays may require the driver to manually clear the message with older cluster software versions. Refer to OEM guidelines regarding the display message reset procedure.

Navistar is offering a dash cluster software update with 6024 transmission SW update that has changed the warning displays. Reference Navistar iKnow article (IK0800550)

• Transmission Air Supply Low - Least Severe:
  • Requirements to set dash response: Engine Running, Trans Current Gear Neutral, Shift device Neutral, Vehicle Not Moving, and Transmission Air Pressure < 90 PSI or Brake Tank Pressure < 106 PSI
  • Dash response was: “Transmission Air Pressure Low Warning” with driver acknowledgment now “System Air Pressure Low” and does not require the driver to manually clear the message.
• Transmission Air Supply Low - Moderately Severe Level:
  • Requirements to set dash response: Vehicle Stopped, Neutral Mode, Shift Device Not Neutral, and Trans Air Pressure < 90 PSI or Brake Tank Pressure < 106 PSI or Vehicle moving and Trans Air Tank Pressure < 85 PSI or Trans in Non-Neutral mode and Trans Air Pressure < 85 PSI
  • New dash response “System Air Pressure Low Gear Change Not Allowed”
• Transmission Air Supply Low - Most Severe Level:
  • Requirements to set dash response: Engine Running, Vehicle Moving, and Trans Air Pressure < 75 PSI.
  • New dash response: System Air Pressure Low Transmission Disabled
• Clutch Abuse - Moderately Severe Level:
  • Requirements to set dash response: clutch plate temperature estimated > 210 C
  • Dash response was: “Clutch Temp High - Function Limited” now “Clutch Temp High”
• Clutch Abuse - Most Severe Level:
  • Requirements to set dash response: clutch plate temperature estimated > 235 C
  • Dash response was: “Clutch Temp Over Limited Allowed” now “Clutch Overheated Allow Clutch to Cool”

Refer to OEM guidelines regarding the display message reset procedure.

Affected Models/Population:

• Endurant Transmissions

Warranty Information:

• Informational Only

Item A:

• Endurant Installation Guide, go to Section 6: Pneumatic System Requirements.

Section 6: Pneumatic System Requirements

Supply Pressure

For optimal performance, the Eaton Endurant Transmission requires a nominal air supply operating range between 99 PSI (6.8 bar) and 130 PSI (9.0 bar). Air supply outside this range can result in degraded or complete loss of transmission shift capabilities. The following figure summaries the significant thresholds for various air supply pressures.