Fault Code 715: Transmission Current Gear
J1939: SA 3 SPN 523 FMI 9
Overview
The Transmission Control Module (TCM) communicates with other vehicle Electronic Control Units (ECUs) over the vehicle Primary Data Link. The TCM sends the Transmission Current Gear and monitors the message to confirm the correct message is being sent.
Detection
The TCM monitors the Transmission Current Gear message. If the message is invalid, the TCM sets the fault code Active.
Conditions to Set Fault Code Active
FMI 9 – Abnormal Update Rate: The Transmission Current Gear message monitor reported the message failed to update.
Fallback
FMI 9:
- Amber warning lamp on
- No degraded modes
Conditions to Set Fault Code Inactive
FMI 9: Key cycle
Possible Causes
FMI 9:
- TCM
- Software issue
- Internal failure
Additional Tools
- None
Fault Code 715 Troubleshooting
Set vehicle parking brake and chock wheels.
Record the transmission fault codes, FMIs, occurrences, and timestamps from the Service Activity report created during the Diagnostic Procedure.
If Fault Code 715 FMI 9 is Inactive or Active, contact Eaton Cummins Automated Transmission Technologies at (800) 826-4357 for further diagnostic instructions. Go to Step V
Key off.
Reconnect all connectors and verify that all components are properly installed.
Key on with engine off.
Connect ServiceRanger.
Go to “Fault Codes”.
Select “Clear All Faults”.
Operate vehicle and attempt to reset the fault code or duplicate the previous complaint.
Check for fault codes using ServiceRanger.
If no fault codes set and the vehicle operates properly, test complete.
If Fault Code 715 sets Active during operation, Go to Step A
If a fault code other than 715 sets Active, troubleshoot per the Fault Code Isolation Procedure Index.