Allison transmission code list can be found here! We also supply diagnostic laptops with Allison DOC if you want to work on your own truck. We also have ABS and other engine software as well. You can clear codes, change parameters, and do everything the dealer can do on a budget. With our Allison diagnostic laptops, you can work on your truck or equipment and save money you would be paying the dealer EVERY TIME! Check out the diagnostics page for more info or just contact us with what you need.
Basic Toughbook laptop with Allison DOC and a Diagnostic Link Adapter for your truck from $1800. Please contact us for more info with what you need!
Allison Transmission Code List Table 1
| DTC | Description | Check Trans Light |
| P0121 | Pedal Postion Sensor Performance Problem | No |
| P0122 | Pedal Postion Sensor Circuit Low Voltage | No |
| P0123 | Pedal Postion Sensor Circuit High Voltage | No |
| P0218 | Transmission Fluid Over Temperature | No |
| P0562 | System Voltage Low | Yes |
| P0563 | System Voltage High | Yes |
| P0602 | TCM Not Programmed Allison Fault Code | Yes |
| P0606 | Controller Internal Performance | Yes |
| P0701 | Transmission Control System Performance | No |
| P0703 | Brake Switch Circuit | No |
| P0705 | Transmission Range Sensor Circuit (PRNDL Input) | No |
| P0706 | Transmission Range Sensor Circuit Performance | Yes |
| P0708 | Transmission Range Sensor Circuit High Input | Yes |
| P0710 | Transmission Fluid Temperature Sensor Malfunction | No |
| P0711 | Transmission Fluid Temperature Sensor Circuit Performance | Yes |
| P0712 | Transmission Fluid Temperature Sensor Circuit Low Input (High Temperature) | Yes |
| P0713 | Transmission Fluid Temperature Sensor Circuit Low Input (Low Temperature) | Yes |
| P0716 | Turbine Speed Sensor Circuit Performance | Yes |
| P0717 | Turbine Speed Sensor Circuit No Signal | Yes |
| P0721 | Output Speed Sensor Circuit Performance | Yes |
| P0722 | Output Speed Sensor Circuit No Signal | Yes |
| P0726 | Engine Speed Input Circuit Performance | Yes |
| P0727 | Engine Speed Sensor Circuit No Signal | Yes |
| P0731 | Incorrect 1st Gear Ratio | Yes |
| P0732 | Incorrect 2nd Gear Ratio | Yes |
| P0733 | Incorrect 3rd Gear Ratio | Yes |
| P0734 | Incorrect 4th Gear Ratio | Yes |
| P0735 | Incorrect 5th Gear Ratio | Yes |
| P0736 | Incorrect Reverse Ratio | Yes |
| P0741 | Torque Converter Clutch System Stuck Off | Yes |
| P0742 | Torque Converter Clutch System Stuck On | Yes |
| P0748 | Pressure Control Solenoid A Electrical | Yes |
| P0763 | Shift Solenoid C Electrical | Yes |
| P0768 | Shift Solenoid D Electrical | Yes |
| P0773 | Shift Solenoid E Electrical | Yes |
| P0778 | Pressure Control Solenoid B Electrical | Yes |
| P0840 | Transmission Pressure Switch Solenoid C Circuit | Yes |
| P0841 | Transmission Pressure Switch Solenoid C Circuit Stuck Open | Yes |
| P0842 | Transmission Pressure Switch Solenoid C Circuit Stuck Closed | Yes |
| P0843 | Transmission Pressure Switch Solenoid C Circuit High | Yes |
| P0845 | Transmission Pressure Switch Solenoid D Circuit | Yes |
| P0846 | Transmission Pressure Switch Solenoid D Circuit | Yes |
| P0847 | Transmission Pressure Swtich Solenoid D Circuit | Yes |
| P0848 | Transmission Pressure Switch Solenoid D Circuit | Yes |
| P1688 | Unmanaged Engine Torque Delivered to TCM | Yes |
| P1709 | Transmission Pressure Switch Solenoid E Circuit | Yes |
| P1710 | Transmission Pressure Switch Solenoid E Circuit Stuck Open | Yes |
| P1711 | Transmission Pressure Switch Solenoid E Circuit Stuck Closed | Yes |
| P1712 | Transmission Pressure Switch Solenoid E Circuit High | Yes |
| P1713 | Transmission Pressure Switch Reverse Circuit | Yes |
| P1714 | Transmission Pressure Switch Reverse Circuit Stuck On | Yes |
| P1716 | Transmission Pressure Switch Reverse Circuit High | no |
| P1718 | Incorrect Neutral Gear Ration | No |
| P1720 | Solenoid A Controlled Clutch Not Engaged | Yes |
| P1721 | Solenoid B Controlled Clutch Not Engaged | Yes |
| P1723 | Solenoid A Controlled Clutch Engaged | Yes |
| P1724 | Solenoid B Controlled Clutch Engaged | Yes |
| P1726 | Shift Solenoid D Controlled Clutch Engaged | No |
| P1727 | Shift Controlled E Clutch Engaged | No |
| P1760 | TCM Supply Voltage Allison Fault Code | No |
| P1779 | Engine Torque Delivered To ECM Allison Fault Code | Yes |
| P1835 | Kickdown Circuit | Yes |
| P1860 | Torque Converter Clutch PWM Solenoid Circuit –Electrical | Yes |
| P1875 | 4WD Low Switch Circuit | Yes |
| P1891 | Throttle Postion Sensor Pulse Width Modulation (PWM) Signal Low Input | No |
| P1892 | Throttle Postion Sensor Pulse Width Modulation (PWM) Signal High Input | No |
| U1000 | Serial Data Communication Link Malfunction (Class2) | No* |
| U1016 | Class 2 Powertrain Controller State of Health Failure | No* |
| U1041 | Class 2 ABS Controller State of Health Failure | No* |
| U1064 | Class 2 TBC Controller State of Health Failure | No* |
| U1096 | Class 2 IPC Controller State of Health Failure Allison Fault Code | No* |
| U1300 | Serial Data Communication Link Low (Class2) | No |
| U1301 | Serial Data Communication Link High (Class2) | No |
| U2104 | Can Bus Rest Counter Overrun | Yes |
| Error code | Description | Lamp Check trans | Control system response |
| C1312 | Retarder trigger low voltage | off | Retarder does not turn on |
| C1313 | Retarder trigger signal high voltage | off | Retarder does not turn on |
| P0122 | Intermittent or low gas pedal position sensor signal | off | Default value is used |
| P0123 | High gas pedal position sensor | off | Default value is used |
| P0218 | Oil temperature is too high | off | A control pattern is used in case of temperature rise. Holds 4th gear. Prohibition of torque converter lock. Gear shift adaptation is deactivated. |
| P0562 | Control unit low voltage | off | Prohibition of torque converter lockout. DNA |
| P0602 | The control unit is not programmed | On | Remains neutral |
| P0610 | Error of additional equipment of the car with the control unit | On | Uses TID A Calibration Data |
| P0613 | Control Unit CPU Error Allison Transmission Code | off | All solenoids are off |
| P0614 | Incompatibility of ECM and TCM data for engine torque control | On | Only neutral, reverse and second gear. Torque lock inhibit, shift adaptation disabled |
| P0634 | Control unit temperature exceeded | On | DNS , SOL OFF , actively hydraulic control. |
| P063E | There is no input signal about the position of the throttle during auto detection | On | Default value is used |
| P063F | No coolant temperature signal during auto detection | off | – |
| P0657 | Open circuit HSD1 | On | SOL OFF , DNA . Prohibition of torque converter lock, prohibition of main modulation. |
| P0658 | Low voltage in the HSD circuit 1 Allison Transmission Code | On | DNS , SOL OFF , hydraulic control is active |
| P0659 | High voltage in the HSD circuit 1 | On | DNS , SOL OFF , hydraulic control is active |
| P0702 | The control unit did not recognize the automatic transmission configuration | On | Uses standard configuration |
| P0703 | Malfunction in a chain of the gauge of a brake | off | On garbage trucks, the inclusion of N – D is not possible . If the code is active, then the retarder is prohibited. |
| P0708 | High signal from the current gear sensor. | On | Ignores the signal of the strip switch |
| P070C | Low oil level sensor signal | off | – |
| P070D | High oil level sensor signal | off | – |
| P0711 | Abnormal oil temperature sensor signal | On | Uses the default temperature |
| P0712 | Low oil temperature sensor signal | On | Uses standard temperature |
| P0713 | High oil temperature sensor signal | On | It uses the standard value tamper Aturi |
| P0716 | Turbine wheel speed sensor abnormal signal | On | DNS , automatic transmission is blocked on the current transfer |
| P0717 | No turbine wheel speed sensor signal | On | DNS , automatic transmission is blocked on the current transfer |
| P0719 | ABS brake signal low | off | Takes ABS off |
| P071A | Incompatible RELS Input | On | RELS function is disabled Allison Transmission Code |
| P071D | Incorrect special function input (wire 101 and 142) | On | – |
| P0721 | Abnormal output speed sensor signal | On | DNS , automatic transmission remains in the current transmission
|
| P0722 | No output speed sensor signal | On | DNS , automatic transmission remains in the current transmission |
| P0726 | Abnormal engine speed sensor signal | off | Uses standard turbine speed |
| P0727 | Missing engine speed sensor signal | off | Uses standard turbine speed |
| P0729 | 6th gear ratio incorrect | On | DNS , trying to enable 5th , then 3rd gear |
| P0731 | 1st gear ratio incorrect | On | DNS , trying to enable 2nd, then 5th gear |
| P0732 | 2nd gear ratio incorrect Allison Fault Code | On | DNS , trying to enable 3rd, then 5th gear |
| P0733 | 3rd gear ratio incorrect | On | DNS , trying to enable 4th, then 6th gear |
| P0734 | 4th gear ratio incorrect Allison Transmission Code | On | DNS , trying to turn on 5th, then 3rd gear |
| P0735 | 5th gear ratio incorrect | On | DNS , trying to turn on the 6th, then 3rd, then 2nd gear |
| P0736 | Incorrect gear ratio in reverse gear | On | DNS blocked on neutral |
| P0741 | Torque converter slip clutch slides | On | – |
| P0752 | Jamming solenoid SS 1 pressure control valve | On | DNS |
| P0776 | Malfunction in the hydraulic circuit of the PCS 2 solenoid | On | DNS, RPR |
| P0777 | Malfunction in the hydraulic circuit of the PCS 2 solenoid | On | DNS, RPR |
| P0796 | Malfunction in the hydraulic circuit of the PCS 3 solenoid | On | DNS, RPR |
| P0797 | Malfunction in the hydraulic circuit of the PCS 3 solenoid | On | DNS, RPR |
| P0842 | PS voltage sensor low voltage 1. | On | DNS , automatic transmission remains in the current transmission |
| P0843 | Pressure Sensor High Voltage PS 1. | On | DNS , automatic transmission remains in the current transmission |
| P0847 | PS 2 pressure sensor low voltage | On | – |
| P0848 | High voltage pressure sensor PS 2 | On | – |
| P0880 | Power failure of the control unit during engine operation | off | – |
| P0881 | The voltage at the control unit is too low or is skipping | off | – |
| P0882 | The voltage at the control unit is below normal. | On | DNS , SOL OFF , hydraulic control is active |
| P0883 | The voltage on the control unit is above normal | off | – |
| P088A | Oil filter clogged Allison Transmission Code | off | – |
| P088B | Oil filter heavily clogged | off | – |
| P0894 | No torque transmission in first gear | On | DNS remains in 1st gear |
| P0897 | Gear oil needs to be replaced | On | – |
| P0960 | Open circuit pressure modulation valve solenoid | On | – |
| P0962 | Low voltage modulation valve solenoid circuit | On | DNS , SOL OFF , hydraulic control active |
| P0963 | High voltage in the pressure modulation valve solenoid circuit | On | – |
| P0964 | PCS2 Solenoid Open Circuit | On | DNS , SOL OFF , hydraulic control active |
| P0966 | PCS 2 Solenoid Circuit Low Voltage Allison Fault Code | On | DNS , SOL OFF , hydraulic control is active |
Allison Transmission Code Table 2
| P0967 | PCS 2 Solenoid High Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P0968 | PCS3 Solenoid Open Circuit | On | DNS , SOL OFF , hydraulic control is active |
| P0970 | PCS 3 Solenoid Circuit Low Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P0971 | PCS 3 Solenoid Circuit High Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P0973 | Low voltage in the solenoid circuit SS 1 | On | DNS , SOL OFF , hydraulic control is active |
| P0974 | High voltage in the solenoid circuit SS 1 | On | DNS , SOL OFF , hydraulic control is active |
| P0975 | Open circuit solenoid SS2 | On | On 7-speed automatic transmissions, 1st and 7th gears are not included |
| P0976 | Low voltage in the solenoid circuit SS 2 | On | On 7-speed automatic transmissions, 1st and 7th gears are not activated, torque converter lockout |
| P0977 | High voltage in the solenoid circuit SS 2 | On | On 7-speed automatic transmissions, 1st and 7th gears are not included |
| P0989 | The signal from the retarder is intermittent | off | Retarder does not turn on |
| P0990 | Retarder sensor signal has a short circuit | off | Retarder does not turn on Allison Fault Code |
| P1739 | Incorrect gear ratio in low gear Allison Transmission Code | On | DNS , prohibition of work in 1 gear |
| P1891 | Accelerator pedal position sensor signal below normal | off | Uses the standard value for pedal depression |
| P1892 | Accelerator Pedal Position Sensor Signal Above Normal | off | Uses the standard value for pedal depression |
| P2184 | Coolant temperature sensor signal low voltage | off | Uses standard temperature Allison Transmission Code |
| P2185 | Coolant Temperature Sensor High Voltage | off | Uses standard temperature |
| P2637 | Malfunction of the torque control system when shifting gears SEM | On | Disabling SEM |
| P2641 | Violation of the torque limiting system in the lower gears of LRTP | On | Disabling LRTP |
| P2669 | Open circuit HSD2 | On | SOL OFF , torque converter inhibit inhibit, main modulation inhibit, DNA |
| P2670 | HSD 2 low voltage | On | DNS , SOL OFF , hydraulic control active |
| P2671 | High voltage in the HSD 2 circuit | On | DNS , SOL OFF , hydraulic control active |
| P2684 | Open circuit HSD3 | On | SOL OFF , torque converter inhibit inhibit, main modulation inhibit, DNA |
Allison Transmission Code Table 3
| P2685 | HSD 3 Low Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P2686 | HSD 3 High Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P2714 | Malfunction in the hydraulic circuit of the PCS 4 solenoid | On | DNS, RPR |
| P2715 | Malfunction in the hydraulic circuit of the PCS 4 solenoid | On | DNS , SOL OFF , hydraulic control is active |
| P2718 | PCS4 Solenoid Open Circuit | On | DNS , SOL OFF , hydraulic control is active |
| P2720 | PCS 4 Solenoid Circuit Low Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P2721 | PCS 4 Solenoid High Voltage | On | DNS , SOL OFF , hydraulic control is active |
| P2723 | Malfunction in the hydraulic circuit of the PCS 1 solenoid | On | DNS, RPR |
| P2724 | Malfunction in the hydraulic circuit of the PCS 1 solenoid | On | DNS, RPR |
| P2727 | PCS1 Solenoid Open Circuit | On | DNS , SOL OFF , hydraulic control is active |
| P2729 | Low voltage in the PCS 1 solenoid circuit | On | DNS , SOL OFF , hydraulic control is active |
| P2730 | High voltage in the PCS 1 solenoid circuit | On | DNS , SOL OFF , hydraulic control is active |
| P2736 | PCS5 Solenoid Open Circuit Allison Transmission Code | On | Prohibition of retarder operation |
| P2738 | PCS 5 Solenoid Circuit Low Voltage | On | Prohibition of work in 1st gear, retarder operation, torque converter lock |
| P2739 | PCS 5 Solenoid Circuit High Voltage | On | Prohibition of retarder operation |
| P2740 | High temperature oil retarders Allison Fault Code | off | – |
| P2742 | Retarder oil temperature sensor low signal | off | Uses standard oil temperature |
| P2743 | Retarder oil temperature sensor high signal | off | Uses standard oil temperature |
| P2761 | Torque converter solenoid open circuit | On | Torque converter lockout |
| P2763 | Low voltage in the torque converter lock-up solenoid circuit | On | Torque converter lockout |
| P2764 | High voltage lock-up torque converter solenoid circuit | On | Torque converter lockout |
| P2789 | Clutch wear reaches limit value | On | – |
| P278A | Wrong Kickdown Signal | off | Kickdown mode ban |
| P2793 | Gear Shift Communication Error | On | Ignores PWM control, if the signal through the CAN – bus is also lost, the latter is locked in a selected direction |
| P2808 | Malfunction in the hydraulic circuit of the PCS 6 solenoid | On | DNS, RPR |
| P2809 | Malfunction in the hydraulic circuit of the PCS 6 solenoid | On | DNS, RPR |
| P2812 | PCS6 Solenoid Open Circuit Allison Transmission Code | On | DNS , SOL OFF , hydraulic control is active |
| P2814 | PCS 6 Solenoid Circuit Low Voltage Allison Transmission Code | On | DNS , SOL OFF , hydraulic control is active |
| P2815 | PCS 6 Solenoid Circuit High Voltage | On | DNS , SOL OFF , hydraulic control is active |
| U0001 | High Speed CAN Bus Counter Overflow ( IESCAN ) | off | Uses standard values; disables torque control when shifting gears |
| U0010 | CAN Bus Counter Overflow ( IESCAN ) | off | Uses standard values; disables torque control when shifting gears |
| U0100 | Loss of communication with the engine / power unit ( J 1586) | On | Uses default values |
| U0103 | Lost Communication With First Gear Shift | On | Remains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / – |
| U0115 | Communication error with engine control unit Allison Transmission Code | On | Uses standard values, DNA |
| U0291 | Communication error with the secondary gear shifter | On | Remains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / – |
| U0304 | Primary gear selector not compatible with J 1939 protocol | On | DNS blocked in neutral |
| U0333 | Secondary switch not compatible with J 1939 protocol | On | DNS blocked in neutral |
| U0400 | Violation of data transmission protocol J 1939 Allison Transmission Code | On | – |
| U0404 | Inadequate information from the primary gear shifter | On | Remains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / – |
| U0442 | The control unit receives incorrect data from the engine / powertrain control unit included in data bus J 1939 | off | – |
| U0592 | Inadequate information from the secondary gear shifter | On | Remains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / – |
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