Allison 1000/2000/24000 Series Electronic Controls Troubleshooting Manual

See also: Allison Transmission 3000/4000 series fault code list

DTC/Description

P0121 Pedal Postion Sensor Performance Problem

P0122 Pedal Postion Sensor Circuit Low Voltage

P0123 Pedal Postion Sensor Circuit High Voltage

P0218 Transmission Fluid Over Temperature 

P0562 System Voltage Low 

P0563 System Voltage High 

P0602 TCM Not Programmed 

P0606 Controller Internal Performance

P0701 Transmission Control System Performance 

P0703 Brake Switch Circuit 

P0705 Transmission Range Sensor Circuit (PRNDL Input) 

P0706 Transmission Range Sensor Circuit Performance 

P0708 Transmission Range Sensor Circuit High Input 

P0710 Transmission Fluid Temperature Sensor Malfunction 

P0711 Transmission Fluid Temperature Sensor Circuit Performance 

P0712 Transmission Fluid Temperature Sensor Circuit Low Input (High Temperature)

P0713 Transmission Fluid Temperature Sensor Circuit Low Input (Low Temperature)

P0716 Turbine Speed Sensor Circuit Performance

P0717 Turbine Speed Sensor Circuit No Signal

P0721 Output Speed Sensor Circuit Performance

P0722 Output Speed Sensor Circuit No Signal

P0726 Engine Speed Input Circuit Performance

P0727 Engine Speed Sensor Circuit No Signal

P0731 Incorrect 1st Gear Ratio 

P0732 Incorrect 2nd Gear Ratio 

P0733 Incorrect 3rd Gear Ratio

P0734 Incorrect 4th Gear Ratio

P0735 Incorrect 5th Gear Ratio 

P0736 Incorrect Reverse Ratio 

P0741 Torque Converter Clutch System Stuck Off 

P0742 Torque Converter Clutch System Stuck On 

P0748 Pressure Control Solenoid A Electrical 

P0763 Shift Solenoid C Electrical 

P0768 Shift Solenoid D Electrical

P0773 Shift Solenoid E Electrical

P0778 Pressure Control Solenoid B Electrical

P0840 Transmission Pressure Switch Solenoid C Circuit 

P0841 Transmission Pressure Switch Solenoid C Circuit Stuck Open  

P0843 Transmission Pressure Switch Solenoid C Circuit High 

P0845 Transmission Pressure Switch Solenoid D Circuit 

P0846 Transmission Pressure Switch Solenoid D Circuit 

P0847 Transmission Pressure Swtich Solenoid D Circuit 

P0848 Transmission Pressure Switch Solenoid D Circuit 

P1688 Unmanaged Engine Torque Delivered to TCM 

P1709 Transmission Pressure Switch Solenoid E Circuit 

P1710 Transmission Pressure Switch Solenoid E Circuit Stuck Open 

P1711 Transmission Pressure Switch Solenoid E Circuit Stuck Closed 

P1712 Transmission Pressure Switch Solenoid E Circuit High 

P1713 Transmission Pressure Switch Reverse Circuit 

P1714 Transmission Pressure Switch Reverse Circuit Stuck On 

P1716 Transmission Pressure Switch Reverse Circuit High 

P1718 Incorrect Neutral Gear Ration 

P1720 Solenoid A Controlled Clutch Not Engaged 

P1721 Solenoid B Controlled Clutch Not Engaged 

P1723 Solenoid A Controlled Clutch Engaged 

P1724 Solenoid B Controlled Clutch Engaged 

P1726 Shift Solenoid D Controlled Clutch Engaged 

P1727 Shift Controlled E Clutch Engaged 

P1760 TCM Supply Voltage 

P1779 Engine Torque Delivered To ECM

P1835 Kickdown Circuit Yes 5-238

P1860 Torque Converter Clutch PWM Solenoid Circuit --Electrical

P1875 4WD Low Switch Circuit 

P1891 Throttle Postion Sensor Pulse Width Modulation (PWM) Signal Low Input 

P1892 Throttle Postion Sensor Pulse Width Modulation (PWM) Signal High Input 

U1000 Serial Data Communication Link Malfunction (Class2) 

U1016 Class 2 Powertrain Controller State of Health Failure 

U1041 Class 2 ABS Controller State of Health Failure 

U1064 Class 2 TBC Controller State of Health Failure 

U1096 Class 2 IPC Controller State of Health Failure 

U1300 Serial Data Communication Link Low (Class2) 

U1301 Serial Data Communication Link High (Class2) 

U2104 Can Bus Rest Counter Overrun 

U2105 Can Bus Error ECM

See also: Allison transmission service manuals