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WARNING - General Transmission Fault Unknown

Today, we'll trying to find out the troubleshooting of warning message: General Transmission Fault Unknownon Murphy PowerView PV101 display (refer to Figure 1.1 above).

We have Pump Truck with CAT Engine C-13 and Allison 4700OFS Transmission. When this warning message appears, the Transmission can't engaged.

#Here the STEPS:
1). Open CAT ET to check if any Active Codes on C-13 Engine. but there's no Active Codes (both Diagnostic and Event Codes).

#Murphy PowerView PV100/ PV101 (Implementation of SAE J1939 Parameters)
#Support Allison DTC's as below:
  • Retarded Temperature Above Normal (SPN 120 - FMI 15)
  • Transmission Oil Temperature Above Normal (SPN 177 - FMI 15)
  • Unknown General Transmission Fault (SPN 2003 - FMI 31)

2). Open Allison DOC and connect to diagnostic port on Allison Transmission.

→No Active DTC's.
In this case, there are 4 logged codes: P2723, P2714, P0722, and P0731.
→Clearing the DTC's Information.

3). After Clear DTC Information, then restart the power supply to TCM.

→The warning message General Transmission Fault Unknown should gone now..

If you have any other questions, Email: [email protected]
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