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17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2686 Actuator Supply Voltage 3 (HSD3) High

DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:The high side drivers are connected to the high side circuits of the...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2714 Pressure Control Solenoid 4 (PCS4) Stuck Off

DIAGNOSTIC RESPONSE:DNS, RPR CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output speed sensors to...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2715 Pressure Control Solenoid 4 (PCS4) Stuck On

DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses input from the turbine speed and output...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2718 Pressure Control Solenoid 4 (PCS4) Control Circuit Open

DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:Pressure Control Solenoid 4 (PCS4) is a normally closed solenoid used to apply...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2720 Pressure Control Solenoid 4 (PCS4) Control Circuit Low

DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:Pressure Control Solenoid 4 (PCS4) is a normally closed solenoid used to apply...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2721 Pressure Control Solenoid 4 (PCS4) Control Circuit High

DIAGNOSTIC RESPONSE:DNS, SOL OFF (hydraulic default) CIRCUIT DESCRIPTION:Pressure Control Solenoid 4 (PCS4) is a normally closed solenoid used to apply...

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