Allison 1000 & 2000 Gen 4 Fault Codes: P0876 Transmission Reverse Pressure Switch Circuit Stuck Open CIRCUIT DESCRIPTION:The Pressure Switch...

Allison 1000 & 2000 Gen 4 Fault Codes: P0880 TCM Supply Voltage CIRCUIT DESCRIPTION:DTC P0880 sets if an abnormal power-down...

Allison 1000 & 2000 Gen 4 Fault Codes: P1779 Engine Torque Delivered To TCM Signal CIRCUIT DESCRIPTION:The GM 8.1 liter...

Allison 1000 & 2000 Gen 4 Fault Codes: P1891 Engine Throttle Position Sensor Pulse Width Modulation (PWM) Signal Low Input...

Allison 1000 & 2000 Gen 4 Fault Codes: P1892 Throttle Position Sensor Pulse Width Modulation (PWM) Signal High Input CIRCUIT...

Allison 1000 & 2000 Gen 4 Fault Codes: P2771 Four-Wheel Drive Switch Circuit CIRCUIT DESCRIPTION:Detects abnormal conditions for the four-wheel...