Allison Transmission Code list for all models

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.

Allison Transmission Code list - diagnostic laptop Allison DOC to work on your transmission

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Allison Transmission Code List Table 1

DTCDescriptionCheck Trans Light
P0121Pedal Postion Sensor Performance ProblemNo
P0122Pedal Postion Sensor Circuit Low VoltageNo
P0123Pedal Postion Sensor Circuit High VoltageNo
P0218Transmission Fluid Over TemperatureNo
P0562System Voltage LowYes
P0563System Voltage HighYes
P0602TCM Not Programmed Allison Fault CodeYes
P0606Controller Internal PerformanceYes
P0701Transmission Control System PerformanceNo
P0703Brake Switch CircuitNo
P0705Transmission Range Sensor Circuit (PRNDL Input)No
P0706Transmission Range Sensor Circuit PerformanceYes
P0708Transmission Range Sensor Circuit High InputYes
P0710Transmission Fluid Temperature Sensor MalfunctionNo
P0711Transmission Fluid Temperature Sensor Circuit PerformanceYes
P0712Transmission Fluid Temperature Sensor Circuit Low Input (High Temperature)Yes
P0713Transmission Fluid Temperature Sensor Circuit Low Input (Low Temperature)Yes
P0716Turbine Speed Sensor Circuit PerformanceYes
P0717Turbine Speed Sensor Circuit No SignalYes
P0721Output Speed Sensor Circuit PerformanceYes
P0722Output Speed Sensor Circuit No SignalYes
P0726Engine Speed Input Circuit PerformanceYes
P0727Engine Speed Sensor Circuit No SignalYes
P0731Incorrect 1st Gear RatioYes
P0732Incorrect 2nd Gear RatioYes
P0733Incorrect 3rd Gear RatioYes
P0734Incorrect 4th Gear RatioYes
P0735Incorrect 5th Gear RatioYes
P0736Incorrect Reverse RatioYes
P0741Torque Converter Clutch System Stuck OffYes
P0742Torque Converter Clutch System Stuck OnYes
P0748Pressure Control Solenoid A ElectricalYes
P0763Shift Solenoid C ElectricalYes
P0768Shift Solenoid D ElectricalYes
P0773Shift Solenoid E ElectricalYes
P0778Pressure Control Solenoid B ElectricalYes
P0840Transmission Pressure Switch Solenoid C CircuitYes
P0841Transmission Pressure Switch Solenoid C Circuit Stuck OpenYes
P0842Transmission Pressure Switch Solenoid C Circuit Stuck ClosedYes
P0843Transmission Pressure Switch Solenoid C Circuit HighYes
P0845Transmission Pressure Switch Solenoid D CircuitYes
P0846Transmission Pressure Switch Solenoid D CircuitYes
P0847Transmission Pressure Swtich Solenoid D CircuitYes
P0848Transmission Pressure Switch Solenoid D CircuitYes
P1688Unmanaged Engine Torque Delivered to TCMYes
P1709Transmission Pressure Switch Solenoid E CircuitYes
P1710Transmission Pressure Switch Solenoid E Circuit Stuck OpenYes
P1711Transmission Pressure Switch Solenoid E Circuit Stuck ClosedYes
P1712Transmission Pressure Switch Solenoid E Circuit HighYes
P1713Transmission Pressure Switch Reverse CircuitYes
P1714Transmission Pressure Switch Reverse Circuit Stuck OnYes
P1716Transmission Pressure Switch Reverse Circuit Highno
P1718Incorrect Neutral Gear RationNo
P1720Solenoid A Controlled Clutch Not EngagedYes
P1721Solenoid B Controlled Clutch Not EngagedYes
P1723Solenoid A Controlled Clutch EngagedYes
P1724Solenoid B Controlled Clutch EngagedYes
P1726Shift Solenoid D Controlled Clutch EngagedNo
P1727Shift Controlled E Clutch EngagedNo
P1760TCM Supply Voltage Allison Fault CodeNo
P1779Engine Torque Delivered To ECM Allison Fault CodeYes
P1835Kickdown CircuitYes
P1860Torque Converter Clutch PWM Solenoid Circuit –ElectricalYes
P18754WD Low Switch CircuitYes
P1891Throttle Postion Sensor Pulse Width Modulation (PWM) Signal Low InputNo
P1892Throttle Postion Sensor Pulse Width Modulation (PWM) Signal High InputNo
U1000Serial Data Communication Link Malfunction (Class2)No*
U1016Class 2 Powertrain Controller State of Health FailureNo*
U1041Class 2 ABS Controller State of Health FailureNo*
U1064Class 2 TBC Controller State of Health FailureNo*
U1096Class 2 IPC Controller State of Health Failure Allison Fault CodeNo*
U1300Serial Data Communication Link Low (Class2)No
U1301Serial Data Communication Link High (Class2)No
U2104Can Bus Rest Counter OverrunYes
Error codeDescriptionLamp

Check trans

Control system response
C1312Retarder trigger low voltageoffRetarder does not turn on
C1313Retarder trigger signal high voltageoffRetarder does not turn on
P0122Intermittent or low gas pedal position sensor signaloffDefault value is used
P0123High gas pedal position sensoroffDefault value is used
P0218Oil temperature is too highoffA control pattern is used in case of temperature rise. Holds 4th gear. Prohibition of torque converter lock. Gear shift adaptation is deactivated.

 

P0562Control unit low voltageoffProhibition of torque converter lockout. DNA
P0602The control unit is not programmedOnRemains neutral
P0610Error of additional equipment of the car with the control unitOnUses TID A Calibration Data
P0613Control Unit CPU Error Allison Transmission CodeoffAll solenoids are off
P0614Incompatibility of ECM and TCM data   for engine torque controlOnOnly neutral, reverse and second gear. Torque lock inhibit, shift adaptation disabled
P0634Control unit temperature exceededOnDNS , SOL OFF , actively hydraulic control.
P063EThere is no input signal about the position of the throttle during auto detectionOnDefault value is used
P063FNo coolant temperature signal during auto detectionoff
P0657Open circuit HSD1OnSOL OFF , DNA . Prohibition of torque converter lock, prohibition of main modulation.
P0658Low voltage in the HSD circuit 1 Allison Transmission CodeOnDNS , SOL OFF ,

hydraulic control is active

P0659High voltage in the HSD circuit 1OnDNS , SOL OFF ,

hydraulic control is active

P0702The control unit did not recognize the automatic transmission configurationOnUses standard configuration
P0703Malfunction in a chain of the gauge of a brakeoffOn garbage trucks, the inclusion of N – D is not possible . If the code is active, then the retarder is prohibited.
P0708High signal from the current gear sensor.OnIgnores the signal of the strip switch
P070CLow oil level sensor signaloff
P070DHigh oil level sensor signaloff
P0711Abnormal oil temperature sensor signalOnUses the default temperature
P0712Low oil temperature sensor signalOnUses standard temperature
P0713High oil temperature sensor signalOnIt uses the standard value tamper Aturi
P0716Turbine wheel speed sensor abnormal signalOnDNS , automatic transmission is blocked on the current transfer
P0717No turbine wheel speed sensor signalOnDNS , automatic transmission is blocked on the current transfer
P0719ABS brake signal lowoffTakes ABS off
P071AIncompatible RELS InputOnRELS function is disabled Allison Transmission Code
P071DIncorrect special function input (wire 101 and 142)On
P0721Abnormal output speed sensor signalOnDNS , automatic transmission remains in the current transmission

 

P0722No output speed sensor signalOnDNS , automatic transmission remains in the current transmission
P0726Abnormal engine speed sensor signaloffUses standard turbine speed
P0727Missing engine speed sensor signaloffUses standard turbine speed
P07296th gear ratio incorrectOnDNS , trying to enable 5th , then 3rd gear
P07311st gear ratio incorrectOnDNS , trying to enable 2nd, then 5th gear
P07322nd gear ratio incorrect Allison Fault CodeOnDNS , trying to enable 3rd, then 5th gear
P07333rd gear ratio incorrectOnDNS , trying to enable 4th, then 6th gear
P07344th gear ratio incorrect Allison Transmission CodeOnDNS , trying to turn on 5th, then 3rd gear
P07355th gear ratio incorrectOnDNS , trying to turn on the 6th, then 3rd, then 2nd gear
P0736Incorrect gear ratio in reverse gearOnDNS blocked on neutral
P0741Torque converter slip clutch slidesOn
P0752Jamming solenoid SS 1 pressure control valveOnDNS
P0776Malfunction in the hydraulic circuit of the PCS 2 solenoidOnDNS, RPR
P0777Malfunction in the hydraulic circuit of the PCS 2 solenoidOnDNS, RPR
P0796Malfunction in the hydraulic circuit of the PCS 3 solenoidOnDNS, RPR
P0797Malfunction in the hydraulic circuit of the PCS 3 solenoidOnDNS, RPR
P0842PS voltage sensor low voltage 1.OnDNS , automatic transmission remains in the current transmission
P0843Pressure Sensor High Voltage PS 1.OnDNS , automatic transmission remains in the current transmission
P0847PS 2 pressure sensor low voltageOn
P0848High voltage pressure sensor PS 2On
P0880Power failure of the control unit during engine operationoff
P0881The voltage at the control unit is too low or is skippingoff
P0882The voltage at the control unit is below normal.OnDNS , SOL OFF ,

hydraulic control is active

P0883The voltage on the control unit is above normaloff
P088AOil filter clogged Allison Transmission Codeoff
P088BOil filter heavily cloggedoff
P0894No torque transmission in first gearOnDNS remains in 1st gear
P0897Gear oil needs to be replacedOn
P0960Open circuit pressure modulation valve solenoidOn
P0962Low voltage modulation valve solenoid circuitOnDNS , SOL OFF , hydraulic control active
P0963High voltage in the pressure modulation valve solenoid circuitOn
P0964PCS2 Solenoid Open CircuitOnDNS , SOL OFF , hydraulic control active
P0966PCS 2 Solenoid Circuit Low Voltage Allison Fault CodeOnDNS , SOL OFF ,

hydraulic control is active

Allison Transmission Code Table 2

P0967PCS 2 Solenoid High VoltageOnDNS , SOL OFF ,

hydraulic control is active

P0968PCS3 Solenoid Open CircuitOnDNS , SOL OFF ,

hydraulic control is active

P0970PCS 3 Solenoid Circuit Low VoltageOnDNS , SOL OFF ,

hydraulic control is active

P0971PCS 3 Solenoid Circuit High VoltageOnDNS , SOL OFF ,

hydraulic control is active

P0973Low voltage in the solenoid circuit SS 1OnDNS , SOL OFF ,

hydraulic control is active

P0974High voltage in the solenoid circuit SS 1OnDNS , SOL OFF ,

hydraulic control is active

P0975Open circuit solenoid SS2OnOn 7-speed automatic transmissions, 1st and 7th gears are not included
P0976Low voltage in the solenoid circuit SS 2OnOn 7-speed automatic transmissions, 1st and 7th gears are not activated, torque converter lockout
P0977High voltage in the solenoid circuit SS 2OnOn 7-speed automatic transmissions, 1st and 7th gears are not included
P0989The signal from the retarder is intermittentoffRetarder does not turn on
P0990Retarder sensor signal has a short circuitoffRetarder does not turn on Allison Fault Code
P1739Incorrect gear ratio in low gear Allison Transmission CodeOnDNS , prohibition of work in 1 gear
P1891Accelerator pedal position sensor signal below normaloffUses the standard value for pedal depression
P1892Accelerator Pedal Position Sensor Signal Above NormaloffUses the standard value for pedal depression
P2184Coolant temperature sensor signal low voltageoffUses standard temperature Allison Transmission Code
P2185Coolant Temperature Sensor High VoltageoffUses standard temperature
P2637Malfunction of the torque control system when shifting gears SEMOnDisabling SEM
P2641Violation of the torque limiting system in the lower gears of LRTPOnDisabling LRTP
P2669Open circuit HSD2OnSOL OFF , torque converter inhibit inhibit, main modulation inhibit, DNA
P2670HSD 2 low voltageOnDNS , SOL OFF , hydraulic control active
P2671High voltage in the HSD 2 circuitOnDNS , SOL OFF , hydraulic control active
P2684Open circuit HSD3OnSOL OFF , torque converter inhibit inhibit, main modulation inhibit, DNA

Allison Transmission Code Table 3

P2685HSD 3 Low VoltageOnDNS , SOL OFF ,

hydraulic control is active

P2686HSD 3 High VoltageOnDNS , SOL OFF ,

hydraulic control is active

P2714Malfunction in the hydraulic circuit of the PCS 4 solenoidOnDNS, RPR
P2715Malfunction in the hydraulic circuit of the PCS 4 solenoidOnDNS , SOL OFF ,

hydraulic control is active

P2718PCS4 Solenoid Open CircuitOnDNS , SOL OFF ,

hydraulic control is active

P2720PCS 4 Solenoid Circuit Low VoltageOnDNS , SOL OFF ,

hydraulic control is active

P2721PCS 4 Solenoid High VoltageOnDNS , SOL OFF ,

hydraulic control is active

P2723Malfunction in the hydraulic circuit of the PCS 1 solenoidOnDNS, RPR
P2724Malfunction in the hydraulic circuit of the PCS 1 solenoidOnDNS, RPR
P2727PCS1 Solenoid Open CircuitOnDNS , SOL OFF ,

hydraulic control is active

P2729Low voltage in the PCS 1 solenoid circuitOnDNS , SOL OFF ,

hydraulic control is active

P2730High voltage in the PCS 1 solenoid circuitOnDNS , SOL OFF ,

hydraulic control is active

P2736PCS5 Solenoid Open Circuit Allison Transmission CodeOnProhibition of retarder operation
P2738PCS 5 Solenoid Circuit Low VoltageOnProhibition of work in 1st gear, retarder operation, torque converter lock
P2739PCS 5 Solenoid Circuit High VoltageOnProhibition of retarder operation
P2740High temperature oil retarders Allison Fault Codeoff
P2742Retarder oil temperature sensor low signaloffUses standard oil temperature
P2743Retarder oil temperature sensor high signaloffUses standard oil temperature
P2761Torque converter solenoid open circuitOnTorque converter lockout
P2763Low voltage in the torque converter lock-up solenoid circuitOnTorque converter lockout
P2764High voltage lock-up torque converter solenoid circuitOnTorque converter lockout
P2789Clutch wear reaches limit valueOn
P278AWrong Kickdown SignaloffKickdown mode ban
P2793Gear Shift Communication ErrorOnIgnores PWM control, if the signal through the CAN – bus is also lost, the latter is locked in a selected direction
P2808Malfunction in the hydraulic circuit of the PCS 6 solenoidOnDNS, RPR
P2809Malfunction in the hydraulic circuit of the PCS 6 solenoidOnDNS, RPR
P2812PCS6 Solenoid Open Circuit Allison Transmission CodeOnDNS , SOL OFF ,

hydraulic control is active

P2814PCS 6 Solenoid Circuit Low Voltage Allison Transmission CodeOnDNS , SOL OFF ,

hydraulic control is active

P2815PCS 6 Solenoid Circuit High VoltageOnDNS , SOL OFF ,

hydraulic control is active

U0001High Speed CAN Bus Counter Overflow ( IESCAN )offUses standard values; disables torque control when shifting gears
U0010CAN Bus Counter Overflow ( IESCAN )offUses standard values; disables torque control when shifting gears
U0100Loss of communication with the engine / power unit ( J 1586)OnUses default values
U0103Lost Communication With First Gear ShiftOnRemains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / –
U0115Communication error with engine control unit Allison Transmission CodeOnUses standard values, DNA
U0291Communication error with the secondary gear shifterOnRemains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / –
U0304Primary gear selector not compatible with J 1939 protocolOnDNS blocked in neutral
U0333Secondary switch not compatible with J 1939 protocolOnDNS blocked in neutral
U0400Violation of data transmission protocol J 1939 Allison Transmission CodeOn
U0404Inadequate information from the primary gear shifterOnRemains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / –
U0442The control unit receives incorrect data from the engine / powertrain control unit included in data bus J 1939off
U0592Inadequate information from the secondary gear shifterOnRemains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / –

Please contact to discuss your Allison diagnostic needs!

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