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Allison 1000 & 2000 Gen 5 Fault Code:P1790 Gear Shift Module 1 Calibration Invalid

CIRCUIT DESCRIPTION:
This DTC sets if the TCM determines the primary shift selector calibration is invalid.

ACTION TAKEN WHEN THE DTC SETS:
1. The CHECK TRANS light illuminates.
2. DTC is stored in the TCM history.
3. Display may be in the wrong language and/or units (English/Metric) could be formatted incorrectly.

CONDITIONS FOR CLEARING THE DTC:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
None

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