Diagnostic Trouble Codes (DTC's) and LED Indicators

Blank

Power is off.

Solid Red

12 volt bus voltage is below 9.6V.

Below 9.6V, the controller hardware will not operate properly.  The controller will automatically reset and hold in a reset state until the system voltage is stable for a duration above this point. 

Solid Green

Voltage OK, internal startup problem.

Slow Blinking Green 

Normal operation.

Fast Blinking Green

System bootloader is running,  ready to update firmware.

Slow Blinking Red

A DTC / fault has occurred, but is not presently active.

Fast Blinking Red

A DTC / fault is occurring now.

Red

One or more active trouble codes.

Yellow

One or more recorded trouble codes.  

Off

No active or recorded trouble codes.

None

No fault

Resistance Low

The effective resistance of the solenoid in the circuit is significantly lower than expected. 

The system knows the expected solenoid resistance and using Ohm's law calculates the effective solenoid resistance using the measured solenoid current and bus voltage.

Usually this fault only occurs with on/off solenoids.

Failing solenoid, bad transmission ground, harness damage.

Resistance High

The effective resistance of the solenoid in the circuit is significantly higher than expected. 

The system knows the expected solenoid resistance and using Ohm's law calculates the effective solenoid resistance using the measured solenoid current and bus voltage.

Usually this fault only occurs with on/off solenoids.

Failing solenoid, bad transmission ground, harness damage.

Current High

There is a short circuit or other solenoid load that is much lower resistance than expected.   

May occur with any type of solenoid.  This is like a circuit breaker tripping.

Short circuit.

Regulation Alternating

The commanded current in the solenoid is varying more than expected.

Only occurs with a PWM solenoid.

Alternator rectifier failure, excessive ripple on the 12V bus.
Poor wiring, bad ground.

Regulation Low

The actual current in the solenoid is consistently less than commanded current in the solenoid 

Only occurs with a PWM solenoid.

Poor wiring to transmission controller, bad ground, excessive ripple on the 12V bus, small gauge wire used where it should not be on power or ground circuits.

Regulation High

The actual current in the solenoid is consistently more than commanded current in the solenoid 

Only occurs with a PWM solenoid.

Poor wiring to transmission controller, bad ground, excessive ripple on the 12V bus, small gauge wire used where it should not be on power or ground circuits.

Invalid Mode

The solenoid driver system was commanded to an invalid mode

This error should never occur on production software.

P0069

Manifold Absolute Pressure - Barometric Pressure Correlation

P0105

Manifold Absolute Pressure/Barometric Pressure Sensor Circuit

P0107

Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low

P0108

Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High

P0115

Engine Coolant Temperature Sensor 1 Circuit

P0117

Engine Coolant Temperature Sensor 1 Circuit Low

The sensor is reporting a position below the expected range.

P0118

Engine Coolant Temperature Sensor 1 Circuit High

The sensor is reporting a position above the expected range.

P0120

Throttle/Pedal Position Sensor/Switch A Circuit

P0122

Throttle/Pedal Position Sensor/Switch A Circuit Low

The sensor is reporting a position below the calibrated range.

P0123

Throttle/Pedal Position Sensor/Switch A Circuit High

The sensor is reporting a position above the calibrated range.

P0218

Transmission Fluid Temperature Sensor A Over Temperature Condition

• Transmission Fluid Temperature Sensor A usually refers to pan temperature. 

• By default this DTC is triggered when the transmission fluid in the pan exceeds 110C for more than 10 seconds.

• Transmission specific, but it generally means the oil is too hot! 

P0500

Vehicle Speed Sensor A Circuit

The vehicle speed sensor on the transmission is malfunctioning.

P0560

ECU Power Supply Very Low

10V -  9.6V to 10V for 5 seconds will trigger an under voltage DTC, "ecu supply very low" / P0560. 

This will also set the STOP bit on the J1939 DM1 broadcast message.

P0562

ECU Power Supply Low

11V -  10V to 11V for 8 seconds will trigger an under voltage DTC, "ecu supply low" / P0562. 

This will also set the WARN bit on the J1939 DM1 broadcast message.

P0602

ECU Program Error

A programming operation on the ECU has failed.

P0634

ECU Temperature Too High

This code is set when the ECU temperature exceeds 75C for 10 seconds or more.

P0638

Throttle Actuator Control Range/Performance Bank 1

P063E

Auto Configuration Throttle Input Not Present Bank 1

The throttle position sensor has not been calibrated properly.

P0701

Transmission Control System Range/Performance

P0702

Transmission Control System Electrical

• Controller power less than 11 volts for 8 seconds

• Controller power less than 10 volts for 5 seconds

• Controller power more than 16 volts for 1 second

P0705

Transmission Range Sensor A Circuit (PRNDL Input)

The transmission range sensor or circuit is having a problem.

P0706

Transmission Range Sensor A Circuit Range/Performance

P0707

Transmission Range Sensor A Circuit Low

The sensor is reporting a position below the plausible range.

P0708

Transmission Range Sensor A Circuit High

The sensor is reporting a position above the plausible range.

P070A

Transmission Fluid Level Sensor Circuit

The fluid level sensor or circuit is having a problem.

P070C

Transmission Fluid Level Sensor Circuit Low

The sensor is reporting a position below the plausible range.

P070D

Transmission Fluid Level Sensor Circuit High

The sensor is reporting a position above the plausible range.

P070F

Transmission Fluid Level Too Low

The transmission fluid is below the proper level.

P0710

Transmission Fluid Temperature Sensor A Circuit

P0712

Transmission Fluid Temperature Sensor A Circuit Low

The sensor is reporting a position below the plausible range.

P0713

Transmission Fluid Temperature Sensor A Circuit High

The sensor is reporting a position above the plausible range.

P0715

Input/Turbine Shaft Speed Sensor A Circuit

P0729

Gear 6 Incorrect Ratio

The measured ratio is not the expected ratio for 6th gear.

P0730

Incorrect Gear Ratio

The measured ratio is not the expected ratio for current gear.

P0731

Gear 1 Incorrect Ratio

The measured ratio is not the expected ratio for 1st gear.

P0732

Gear 2 Incorrect Ratio

The measured ratio is not the expected ratio for 2nd gear.

P0733

Gear 3 Incorrect Ratio

The measured ratio is not the expected ratio for 3rd gear.

P0734

Gear 4 Incorrect Ratio

The measured ratio is not the expected ratio for 4th gear.

P0735

Gear 5 Incorrect Ratio

The measured ratio is not the expected ratio for 5th gear.

P0736

Reverse Incorrect Ratio

The measured ratio is not the expected ratio for reverse.

P073D

Unable to Engage Neutral

The shift control system could not shift to neutral.

P073E

Unable to Engage Reverse

The shift control system could not shift to reverse.

P073F

Unable to Engage Gear 1

This shift control system could not shift to 1st gear.

P0740

Torque Converter Clutch Circuit/Open

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0745

Pressure Control Solenoid A

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0750

Shift Solenoid A

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0755

Shift Solenoid B

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P075A

Shift Solenoid G

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0760

Shift Solenoid C

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0765

Shift Solenoid D

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P076A

Shift Solenoid H

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P076F

Gear 7 Incorrect Ratio

The measured ratio is not the expected ratio for 7th gear.

P0770

Shift Solenoid E

P0775

Pressure Control Solenoid B

P077F

Reverse 2 Incorrect Ratio

P0781

1-2 Shift

P0782

2-3 Shift

P0783

3-4 Shift

P0784

4-5 Shift

P0785

Shift Timing Solenoid A

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P078A

Shift Timing Solenoid B

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0795

Pressure Control Solenoid C

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P07D9

Gear 8 Incorrect Ratio

The measured ratio is not the expected ratio for 8th gear.

P07DA

6-7 Shift

P07DB

7-8 Shift

P07DD

Incorrect Shift From Gear 2

P07DE

Incorrect Shift From Gear 3

P07DF

Incorrect Shift From Gear 4

P07E0

Incorrect Shift From Gear 5

P07E1

Incorrect Shift From Gear 6

P07E2

Incorrect Shift From Gear 7

P07E3

Incorrect Shift From Gear 8

P07F6

Gear 9 Incorrect Ratio

The measured ratio is not the expected ratio for 9th gear.

P07F7

Gear 10 Incorrect Ratio

The measured ratio is not the expected ratio for 10th gear.

P0829

5-6 Shift

P083B

Transmission Fluid Pressure Sensor/Switch G Circuit Range/Performance

P0840

Transmission Fluid Pressure Sensor/Switch A Circuit

P0841

Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance

P0842

Transmission Fluid Pressure Sensor/Switch A Circuit Low

The sensor is reporting a pressure below the plausible range.

P0843

Transmission Fluid Pressure Sensor/Switch A Circuit High

The sensor is reporting a pressure above the plausible range.

P0846

Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance

P084B

Transmission Fluid Pressure Sensor/Switch H Circuit Range/Performance

P0869

Transmission Fluid Pressure High

P0871

Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance

P0876

Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance

P0928

Gear Shift Lock Solenoid/Actuator Control Circuit A/Open

P092A

Gear Shift Lock Solenoid/Actuator Control Circuit B/Open

P093A

Hydraulic Accumulator Solenoid Circuit/Open

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P0988

Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance

P0993

Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance

P1700

ECU Restart Required

A change in programming or calibration has occurred that requires a restart on the ECU.

P2135

Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

P2706

Shift Solenoid F

P2713

Pressure Control Solenoid D

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P2722

Pressure Control Solenoid E

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P2731

Pressure Control Solenoid F

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P2756

Torque Converter Clutch Pressure Control Solenoid

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P2765

Input/Turbine Shaft Speed Sensor B Circuit

P273F

Transmission Fluid Temp B Too High

• Transmission Fluid B is usually the torque converter outlet temperature. 

• This DTC is usually triggered when the fluid temperature exceeds 120C for more than 10 seconds.

P2742

Transmission Fluid Temp B Sensor Voltage Too Low

The sensor is reporting a voltage below the plausible range.

P2743

Transmission Fluid Temp B Sensor Voltage Too High

The sensor is reporting a voltage above the plausible range.

P2740

Transmission Fluid Temp B Sensor Voltage Circuit

P2807

Pressure Control Solenoid G

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P2816

Pressure Control Solenoid H

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P281F

Pressure Control Solenoid J

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

P2828

Pressure Control Solenoid K

Indicates an electrical fault with the solenoid which could be an open circuit, short circuit, incorrect resistance, poor ground or power.

U0100

Lost Communication With ECM/PCM A

U0102

Lost Communication With Transfer Case Control Module

U0103

Lost Communication With Gear Shift Control Module A

U0104

Lost Communication With Cruise Control Module

U0121

Lost Communication With Anti-Lock Brake System (ABS) Control Module

U0129

Lost Communication With Brake System Control Module

U013C

Lost Communication With Accelerator Pedal Module

U013C

Lost Communication With Accelerator Pedal Module

U019E

Lost Communication With Transmission Range Control Module

U0258

Lost Communication With Radio Transceiver

U0293

Lost Communication With Hybrid/EV Powertrain Control Module

U0401

Invalid Data Received From ECM/PCM A

U0403

Invalid Data Received From Transfer Case Control Module

U0404

Invalid Data Received From Gear Shift Control Module A

U0405

Invalid Data Received From Cruise Control Module

U0415

Invalid Data Received From Anti-Lock Brake System (ABS) Control Module

U0418

Invalid Data Received From Brake System Control Module

U043D

Invalid Data Received From Accelerator Pedal Module

U049F

Invalid Data Received From Transmission Range Control Module

U0594

Invalid Data Received From Hybrid/EV Powertrain Control Module