Fault Code 83: Invalid Shift Lever Position
J1587 MID 130 SID 18 FMI 14
J1939 SA 3 SPN 751 FMI 14
Overview
The UltraShift PLUS transmission may be equipped with an analog shift control device. The Transmission Electronic Control Unit (TECU) supplies the analog Shift Control Device a 5-volt reference through OEM wiring. This voltage is reduced by resistive ladder circuitry in the shift device, based on the position the driver selects. The return voltage to the TECU indicates the position of the Shift Lever. Fault Code 83 indicates the TECU did not identify a Shift Lever position.
Detection
The TECU monitors Shift Lever position by supplying voltage to the Shift Lever and measuring the returned voltage. When the return voltage received by the TECU does not match any known shift mode this fault code sets Active.
Conditions to Set Fault Code Active
FMI 14 – Special Instructions: Selected lever position is invalid for 0.5 seconds or longer.
Fallback
FMI 14
- “F” flashes in gear display.
- Service light flashes (if equipped).
- Transmission may not engage a gear from neutral.
- Transmission enters downshift-only mode.
Conditions to Set Fault Code Inactive
FMI 14: TECU recognizes a valid Shift Lever position from the Shift Lever after 0.2 seconds.
Possible Causes
FMI 14
- Vehicle Analog Shift Device
- Internal failure
- Lever positioned between two modes
- Eaton Cobra Shift Lever
- Internal failure
- Lever positioned between two modes
Component Identification
 |
Eaton Cobra Lever |
Fault Code 83 Troubleshooting
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity Report created during the Diagnostic Procedure.
If Fault Code 83 is Active, replace Shift Lever. Go to Step V
If Fault Code 83 is Inactive, Go to Step B
Key on with engine off.
Set parking brake and chock wheels.
Depress service brake pedal.
Shift the Lever into Reverse (R), Drive (D), Low (L) and Neutral (N) modes.
Monitor the vehicle gear display and Shift Lever mode lights (if equipped). Ensure that when each mode is selected an appropriate gear is engaged by the transmission.
If lever positions do not match gear display, replace Shift Lever. Go to Step V
If lever positions match gear display, test complete. Go to Step V
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Clear fault codes using ServiceRanger.
Drive vehicle and attempt to reset the code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set Active and vehicle operates properly, test complete.
If Fault Code 83 sets Active during the test drive, Go to Step A
If a fault code other than 83 sets Active, troubleshoot per Fault Code Isolation Procedure Index.