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FAULT CODES
1000 TRANSMISSIONS
2000 TRANSMISSIONS
ALLISON 1000/2000/24000 SERIES ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
Check
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DIAGNOSTIC TROUBLE COPDES (DTC)
5-5. DIAGNOSTIC TROUBLE CODES (DTCs)
DTC LIST AND DESCRIPTIONS INDEX
Trans
DTC Description
P0121 Pedal Postion Sensor Performance Problem No 5-15
P0122 Pedal Postion Sensor Circuit Low Voltage No 5-16
P0123 Pedal Postion Sensor Circuit High Voltage No 5-19
P0218 Transmission Fluid Over Temperature No 5-22
P0562 System Voltage Low Yes 5-26
P0563 System Voltage High Yes 5-29
P0602 TCM Not Programmed Yes 5-33
P0606 Controller Internal Performance Yes 5-34
P0701 Transmission Control System Performance No 5-35
P0703 Brake Switch Circuit No 5-37
P0705 Transmission Range Sensor Circuit (PRNDL Input) No 5-41
P0706 Transmission Range Sensor Circuit Performance Yes 5-45
P0708 Transmission Range Sensor Circuit High Input Yes 5-49
P0710 Transmission Fluid Temperature Sensor Malfunction No 5-53
P0711 Transmission Fluid Temperature Sensor Circuit Performance Yes 5-57
P0712 Transmission Fluid Temperature Sensor Circuit Low Input (High Temperature) Yes 5-61
P0713 Transmission Fluid Temperature Sensor Circuit Low Input (Low Temperature) Yes 5-65
P0716 Turbine Speed Sensor Circuit Performance Yes 5-69
P0717 Turbine Speed Sensor Circuit No Signal Yes 5-73
P0721 Output Speed Sensor Circuit Performance Yes 5-77
P0722 Output Speed Sensor Circuit No Signal Yes 5-81
P0726 Engine Speed Input Circuit Performance Yes 5-85
P0727 Engine Speed Sensor Circuit No Signal Yes 5-89
P0731 Incorrect 1st Gear Ratio Yes 5-93
P0732 Incorrect 2nd Gear Ratio Yes 5-97
P0733 Incorrect 3rd Gear Ratio Yes 5-101
P0734 Incorrect 4th Gear Ratio Yes 5-105
P0735 Incorrect 5th Gear Ratio Yes 5-109
P0736 Incorrect Reverse Ratio Yes 5-113
P0741 Torque Converter Clutch System Stuck Off Yes 5-117
P0742 Torque Converter Clutch System Stuck On Yes 5-120
P0748 Pressure Control Solenoid A Electrical Yes 5-123
P0763 Shift Solenoid C Electrical Yes 5-127
P0768 Shift Solenoid D Electrical Yes 5-131
P0773 Shift Solenoid E Electrical Yes 5-135
P0778 Pressure Control Solenoid B Electrical Yes 5-139
P0840 Transmission Pressure Switch Solenoid C Circuit Yes 5-143
P0841 Transmission Pressure Switch Solenoid C Circuit Stuck Open Yes 5-147
Light
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ALLISON 1000/2000/24000 SERIES ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
CHECK
Page 6
DIAGNOSTIC TROUBLE COPDES (DTC)
DTC LIST AND DESCRIPTIONS INDEX (cont'd )
TRANS
DTC Description
P0842 Transmission Pressure Switch Solenoid C Circuit Stuck Closed Yes 5-151
P0843 Transmission Pressure Switch Solenoid C Circuit High Yes 5-155
P0845 Transmission Pressure Switch Solenoid D Circuit Yes 5-159
P0846 Transmission Pressure Switch Solenoid D Circuit Yes 5-163
P0847 Transmission Pressure Swtich Solenoid D Circuit Yes 5-167
P0848 Transmission Pressure Switch Solenoid D Circuit Yes 5-171
P1688 Unmanaged Engine Torque Delivered to TCM Yes 5-175
P1709 Transmission Pressure Switch Solenoid E Circuit Yes 5-177
P1710 Transmission Pressure Switch Solenoid E Circuit Stuck Open Yes 5-181
P1711 Transmission Pressure Switch Solenoid E Circuit Stuck Closed Yes 5-185
P1712 Transmission Pressure Switch Solenoid E Circuit High Yes 5-189
P1713 Transmission Pressure Switch Reverse Circuit Yes 5-193
P1714 Transmission Pressure Switch Reverse Circuit Stuck On Yes 5-197
P1716 Transmission Pressure Switch Reverse Circuit High no 5-201
P1718 Incorrect Neutral Gear Ration No 5-205
P1720 Solenoid A Controlled Clutch Not Engaged Yes 5-209
P1721 Solenoid B Controlled Clutch Not Engaged Yes 5-213
P1723 Solenoid A Controlled Clutch Engaged Yes 5-217
P1724 Solenoid B Controlled Clutch Engaged Yes 5-221
P1726 Shift Solenoid D Controlled Clutch Engaged No 5-225
P1727 Shift Controlled E Clutch Engaged No 5-229
P1760 TCM Supply Voltage No 5-233
P1779 Engine Torque Delivered To ECM Yes 5-236
P1835 Kickdown Circuit Yes 5-238
P1860 Torque Converter Clutch PWM Solenoid Circuit --Electrical Yes 5-241
P1875 4WD Low Switch Circuit Yes 5-245
P1891 Throttle Postion Sensor Pulse Width Modulation (PWM) Signal Low Input No 5-249
P1892 Throttle Postion Sensor Pulse Width Modulation (PWM) Signal High Input No 5-252
U1000 Serial Data Communication Link Malfunction (Class2) No* 5-255
U1016 Class 2 Powertrain Controller State of Health Failure No* 5-258
U1041 Class 2 ABS Controller State of Health Failure No* 5-261
U1064 Class 2 TBC Controller State of Health Failure No* 5-264
U1096 Class 2 IPC Controller State of Health Failure No* 5-267
U1300 Serial Data Communication Link Low (Class2) No 5-270
U1301 Serial Data Communication Link High (Class2) No 5-273
U2104 Can Bus Rest Counter Overrun Yes 5-276
U2105 Can Bus Error ECM Yes 5-279
LIGHT
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