CIRCUIT DESCRIPTION:
The Transmission Control Module (TCM) performs an internal memory self-test at power up that tests Flash Memory.
ACTION TAKEN WHEN THE DTC SETS:
1. The CHECK TRANS light illuminates.
2. Hydraulic Default. The transmission is restricted to Reverse, Neutral, and 3rd range.
CONDITIONS FOR CLEARING THE DTC:
Replace TCM.
DIAGNOSTIC AIDS:
Replace TCM.
Allison 1000 & 2000 Gen 5 Fault Code:P0602 TCM Not Programmed
Allison 1000 & 2000 Gen 5 Fault Code:P0563 System Voltage – High
Allison 1000 & 2000 Gen 5 Fault Code:P0562 System Voltage – Low
Allison 1000 & 2000 Gen 5 Fault Code:P0561 System Voltage – Performance
Allison 1000 & 2000 Gen 5 Fault Code:P0218 Transmission Fluid Over Temperature
Allison 1000 & 2000 Gen 5 Fault Code:P0123 Pedal Position Sensor Circuit – High Voltage
