Allison

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16 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: U0400 Invalid Communication Link Data Received (CAN1/J1939 Brake Switch)

DIAGNOSTIC RESPONSE:None CIRCUIT DESCRIPTION:In 4th Generation Controls, the preferred digital datalink is the SAE J1939 Controller Area Network (CAN). The...

16 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: U0404 Invalid Data Received From Gear Shift Module 1 (Shift Selector)

DIAGNOSTIC RESPONSE:Maintain range selected, observe gear shift direction circuit CIRCUIT DESCRIPTION:The OEM 4th Generation Controls shift selectors communicate with the...

16 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: U0442 Invalid Data Received From ECM/PCM B (CAN1/J1939)

DIAGNOSTIC RESPONSE:None CIRCUIT DESCRIPTION:In OEM 4th Generation Controls, the preferred digital datalink is the SAE J1939 Controller Area Network (CAN)....

16 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: U0592 Invalid Data Received From Gear Shift Module 2 (Shift Selector)

DIAGNOSTIC RESPONSE:Maintain range selected, observe gear shift direction circuit CIRCUIT DESCRIPTION:The OEM 4th Generation Controls shift selectors communicate with the...

14 March, 2025

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Allison 1000 & 2000 Gen 5 Fault Code:P0122 Pedal Position Sensor Circuit – Low Voltage

CIRCUIT DESCRIPTION:The TCM receives input on throttle position from either a TPS or a signal transmitted by the engine electronic...

14 March, 2025

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Allison 1000 & 2000 Gen 5 Fault Code:P0123 Pedal Position Sensor Circuit – High Voltage

CIRCUIT DESCRIPTION:The TCM receives input on throttle position from either a TPS or a signal transmitted by the engine electronic...

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