Allison 1000 & 2000 Gen 4 Fault Codes: P0719 Brake Switch ABS Input Low CIRCUIT DESCRIPTION:If the vehicle is equipped...

Allison 1000 & 2000 Gen 4 Fault Codes: P0721 Output Speed Sensor Circuit Performance CIRCUIT DESCRIPTION:The speed sensors are variable...

Allison 1000 & 2000 Gen 4 Fault Codes: P0722 Output Speed Sensor Circuit No Signal CIRCUIT DESCRIPTION:The speed sensors are...

Allison 1000 & 2000 Gen 4 Fault Codes: P0726 Engine Speed Input Circuit Performance CIRCUIT DESCRIPTION:The speed sensors are variable...

Allison 1000 & 2000 Gen 4 Fault Codes: P0727 Engine Speed Input Circuit No Signal CIRCUIT DESCRIPTION:The speed sensors are...

Allison 1000 & 2000 Gen 4 Fault Codes: P0731 Incorrect 1st Gear Ratio CIRCUIT DESCRIPTION:The Transmission Control Module (TCM) uses...