Eaton Gen 2 (AutoShift) Fault Code: 26 PID: SID 55 FMI: 10 Clutch Slip

Overview:
Fault Code 26 indicates the clutch is not performing as expected. The Transmission Controller detected excessive clutch slip.

Detection:
When the transmission is in gear and the clutch is fully engaged, engine speed and Input Shaft speed are compared. If the engine speed is significantly different from the Input Shaft speed for a period of 1 second, the Fault Code is set.

Fallback:
This fault causes a down-shift fallback. Once the vehicle is stopped, starting gear and reverse gear can be engaged. The fault will clear at power down and up shifts will be allowed until the fault is detected again.

Possible Causes:
1) Worn or broken clutch

Shop Talk:
Operate the vehicle under load in highest gear possible with engine speed above 1500 RPM. At a steady speed, quickly and fully press the throttle. The failure is detected when clutch slip occurs.