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Eaton Transmission Fault Codes

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EATON TRANSMISSION FAULT CODES
EATON TRANSMISSION FAULT CODES
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Retrieving Fault Codes

1. Place the shift lever in neutral.

2. Set the parking brake.

3. Turn the ignition key ON but do not start the engine. If the engine is already running,

you may still retrieve codes, however, do not engage the starter if engine stalls.

4. To Retrieve Active Codes: Start with the key in the ON position. Turn the key OFF

and ON two times within five seconds ending with the key in the ON position. After

five seconds, the gear display begins flashing two-digit fault codes. If there are no

active codes the gear display will show code 25. If there are inactive codes PD

(Product Diagnostic mode) will be displayed. The vehicle will not start in PD mode.

You must turn vehicle key OFF and allow the system to power down to exit PD mode

before restarting. To start engine turn key off and wait for the transmission to 

power down.

5. To Retrieve Inactive Codes: Start with the key in the ON position. Turn the key OFF

and ON four times within five seconds ending with the key in the ON position. After

five seconds, the gear display begins flashing two-digit fault codes. If no codes are

active, the gear display will flash code 25 (no codes).

6. Two digit fault codes will be displayed in the gear display. Record the codes. A one

or two second pause separates each stored code, and the sequence automatically

repeats after all codes have been flashed.

 

Clearing Fault Codes

 

1. Start with the key in the ON position. Turn the key OFF and ON six times within five

seconds, ending with the key in the ON position.

 Note: If the codes have been successfully cleared, the service lamp will come on

and stay on for five seconds.

2. Turn the key OFF and allow system to power down.


Fault Codes Description

 

11 No ECU. Operation Test

12 Improper ECU Configuration

13 J1939 Control Device

14 Invalid Shift Lever Voltage

16 High Integrity Link

17 Start Enable Relay

25 NO CODES

26 Clutch Slip

27 Clutch Disengagement

28 Clutch System

31 Momentary Engine Ignition Interrupt Relay MEIIR

32 Loss of Switch Ignition Power Test

33 Low Voltage Supply

34 Weak Battery Voltage Supply

35 J1939 Communication Link

36 J1939 Engine Message Test

37 Power Supply

41 Range Failed to Engage

42 Splitter Failed to Engage Fault Codes Description

43 Range Solenoid Valve

44 Inertia Brake Solenoid Coil

45 Inertia Brake Performance

46 Splitter Solenoid Valve

51 Rail Position Sensor

52 Gear Position Sensor

56 Input Shaft Sensor

57 Main Shaft Sensor

58 Output Shaft Sensor

61 Rail Select Motor

63 Gear Select Motor

71 Unable to Disengage Gear

72 Failed to Select Rail

73 Failed to Select Gear

74 Engine Failed to Respond

75 Power Down in Gear

83 Shift Lever Missing

84 Shift Controller Device Not Configured

85 Shift Control Device Incompatible


Driving Tips

 

The clutch is only needed at Start-up, when selecting a starting gear, and when stopping. 

“D”, “M” and “L” can be selected at any speed.

If the down arrows continue to flash after selecting a starting gear even after pushing the clutch 

pedal all the way to the floor and waiting several seconds, it means that the input shaft has not 

slowed down enough to engage the gear. This could be caused by a misadjusted clutch or a faulty 

clutch or clutch linkage.

When first starting up and after changing loads, AutoShift needs to adapt to the changing 

conditions of the vehicle. If the transmission holds a gear while in “D”, simply pull the lever 

towards you and the shift will be completed. This may have to be done several times before the 

transmission learns.

When AutoShift is downshifting in “D” it will not complete the shifts below a preset gear 

(normally 9th gear in an 18 speed transmission) and the vehicle will “coast down” until the driver 

gets back on the throttle.

Manual Mode “M” should be used whenever you want to control the shifts, such as moving 

around the yard, going up a grade, or in poor traction situations.

Low Mode “L” should be used anytime you want to maximize the engine brake such as going 

down a long grade, or when coming to a stop.

AutoShift can activate the engine brake to make shifts faster. This can happen even if

-the engine 

brake dash switch is off.

If a shift is required while in cruise, AutoShift will interrupt cruise while performing the shift and 

automatically re-engage cruise after the shift is complete.

If AutoShift has detected a fault in the system you will see an “F” in the gear display. Note the 

conditions at which the fault occurred (hot/cold, wet/dry, on a grade/flat terrain) and get the 

vehicle to a service facility. Some faults will not allow the AutoShift to shift into other gears. You 

can try to reset the system by powering the system down for 5 minutes which may clear the fault 

long enough to get to a service facility.

If the engine is shut off, stalls while in gear, or a dash “–” appears on the gear display 

after power up, perform the following procedure to try to get the transmission back into 

neutral:

1. Turn key “Off” and let transmission power down for at least 5 minutes.

2. Release parking brake and hold vehicle by using the brake pedal.

3. Depress clutch pedal but DO NOT push it all the way to floor making contact with the 

clutch brake.

4. Make sure shifter is in neutral.

5. Turn ignition key “On”

.

6. Slightly release the brake pedal to let the torque off the driveline. AutoShift will attempt to 

shift into neutral. If neutral is achieved, the “N” will appear on the shift display and truck 

will start.

NOTE: If the above procedure does not work, get the vehicle to a service facility

Eaton Ultrashiftplus
Eaton Ultrashiftplus