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17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2738 Pressure Control Solenoid 5 (PCS5) Control Circuit Low

DIAGNOSTIC RESPONSE:Allow 2 through 6, N, R. Inhibit retarder and TCC operation CIRCUIT DESCRIPTION:Pressure Control Solenoid 5 (PCS5) is a...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2739 Pressure Control Solenoid 5 (PCS5) Control Circuit High

DIAGNOSTIC RESPONSE:Inhibit retarder operation CIRCUIT DESCRIPTION:Pressure Control Solenoid 5 (PCS5) is a normally closed solenoid used to apply the retarder...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2740 Retarder Oil Temperature Hot

DIAGNOSTIC RESPONSE:None CIRCUIT DESCRIPTION:A retarder Transmission Fluid Temperature (TFT) sensor monitors retarder cavity fluid temperature. The sensor consists of a...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2742 Retarder Oil Temperature Sensor Circuit Low Input

DIAGNOSTIC RESPONSE:Use default retarder temperature values CIRCUIT DESCRIPTION:A retarder Transmission Fluid Temperature (TFT) sensor monitors retarder cavity fluid temperature. The...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2743 Retarder Oil Temperature Sensor Circuit High Input

DIAGNOSTIC RESPONSE:Use default retarder temperature values CIRCUIT DESCRIPTION:A retarder Transmission Fluid Temperature (TFT) sensor monitors retarder cavity fluid temperature. The...

17 March, 2025

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Allison 3000 & 4000 Gen 4 Fault Code: P2761 TCC PCS Control Circuit Open

DIAGNOSTIC RESPONSE:Inhibit TCC operation CIRCUIT DESCRIPTION:The Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) is a normally closed solenoid used...

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