Controller LED Indicators

The LED indicators on the COMPUSHIFT Sport and COMPUSHIFT Pro illuminate in various patterns and combinations as follows:


LED PatternMEANING
BlankPower is off.
Solid Red12 volt bus voltage is low.
Solid GreenVoltage OK, internal startup problem.
Slow Blinking Green Normal operation.
Fast Blinking GreenSystem bootloader is running,  ready to update firmware.
Slow Blinking RedA DTC / fault has occurred, but is not presently active.
Fast Blinking RedA DTC / fault is occurring now.

Regulation Fault Codes

Regulation
Fault Code

MeaningNotes

Possible
Causes

NoneNo 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 HighThere 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 AlternatingThe 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 LowThe 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 HighThe 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 ModeThe solenoid driver system was commanded to an invalid modeThis error should never occur on production software.

Diagnostic Trouble Codes

The following is a complete list of all possible trouble codes on the COMPUSHIFT Pro and COMPUSHIFT Sport.  

Not all of these are used in all configurations.

CodeMeaningPossible Causes
P0069Manifold Absolute Pressure - Barometric Pressure Correlation
P0105Manifold Absolute Pressure/Barometric Pressure Sensor Circuit
P0107Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Low
P0108Manifold Absolute Pressure/Barometric Pressure Sensor Circuit High
P0115Engine Coolant Temperature Sensor 1 Circuit
P0117Engine Coolant Temperature Sensor 1 Circuit Low
P0118Engine Coolant Temperature Sensor 1 Circuit High
P0120Throttle/Pedal Position Sensor/Switch A Circuit
P0122Throttle/Pedal Position Sensor/Switch A Circuit Low
P0123Throttle/Pedal Position Sensor/Switch A Circuit High
P0218Transmission Fluid Temperature Sensor A Over Temperature ConditionTransmission specific, but it means too hot!
P0500Vehicle Speed Sensor A Circuit
P0638Throttle Actuator Control Range/Performance Bank 1
P063EAuto Configuration Throttle Input Not Present Bank 1
P0701Transmission Control System Range/Performance
P0702Transmission 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
P0705Transmission Range Sensor A Circuit (PRNDL Input)
P0706Transmission Range Sensor A Circuit Range/Performance
P0707Transmission Range Sensor A Circuit Low
P0708Transmission Range Sensor A Circuit High
P070ATransmission Fluid Level Sensor Circuit
P070CTransmission Fluid Level Sensor Circuit Low
P070DTransmission Fluid Level Sensor Circuit High
P070FTransmission Fluid Level Too Low
P0710Transmission Fluid Temperature Sensor A Circuit
P0712Transmission Fluid Temperature Sensor A Circuit Low
P0713Transmission Fluid Temperature Sensor A Circuit High
P0715Input/Turbine Shaft Speed Sensor A Circuit
P0729Gear 6 Incorrect Ratio
P0730Incorrect Gear Ratio
P0731Gear 1 Incorrect Ratio
P0732Gear 2 Incorrect Ratio
P0733Gear 3 Incorrect Ratio
P0734Gear 4 Incorrect Ratio
P0735Gear 5 Incorrect Ratio
P0736Reverse Incorrect Ratio
P073DUnable to Engage Neutral
P073EUnable to Engage Reverse
P073FUnable to Engage Gear 1
P0740Torque Converter Clutch Circuit/Open
P0745Pressure Control Solenoid A
P0750Shift Solenoid A
P0755Shift Solenoid B
P075AShift Solenoid G
P0760Shift Solenoid C
P0765Shift Solenoid D
P076AShift Solenoid H
P076FGear 7 Incorrect Ratio
P0770Shift Solenoid E
P0775Pressure Control Solenoid B
P077FReverse 2 Incorrect Ratio
P07811-2 Shift
P07822-3 Shift
P07833-4 Shift
P07844-5 Shift
P0785Shift Timing Solenoid A
P078AShift Timing Solenoid B
P0795Pressure Control Solenoid C
P07D9Gear 8 Incorrect Ratio
P07DA6-7 Shift
P07DB7-8 Shift
P07DDIncorrect Shift From Gear 2
P07DEIncorrect Shift From Gear 3
P07DFIncorrect Shift From Gear 4
P07E0Incorrect Shift From Gear 5
P07E1Incorrect Shift From Gear 6
P07E2Incorrect Shift From Gear 7
P07E3Incorrect Shift From Gear 8
P07F6Gear 9 Incorrect Ratio
P07F7Gear 10 Incorrect Ratio
P08295-6 Shift
P083BTransmission Fluid Pressure Sensor/Switch G Circuit Range/Performance
P0840Transmission Fluid Pressure Sensor/Switch A Circuit
P0841Transmission Fluid Pressure Sensor/Switch A Circuit Range/Performance
P0842Transmission Fluid Pressure Sensor/Switch A Circuit Low
P0843Transmission Fluid Pressure Sensor/Switch A Circuit High
P0846Transmission Fluid Pressure Sensor/Switch B Circuit Range/Performance
P084BTransmission Fluid Pressure Sensor/Switch H Circuit Range/Performance
P0869Transmission Fluid Pressure High
P0871Transmission Fluid Pressure Sensor/Switch C Circuit Range/Performance
P0876Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance
P0928Gear Shift Lock Solenoid/Actuator Control Circuit A/Open
P092AGear Shift Lock Solenoid/Actuator Control Circuit B/Open
P093AHydraulic Accumulator Solenoid Circuit/Open
P0988Transmission Fluid Pressure Sensor/Switch E Circuit Range/Performance
P0993Transmission Fluid Pressure Sensor/Switch F Circuit Range/Performance
P2135Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
P2706Shift Solenoid F
P2713Pressure Control Solenoid D
P2722Pressure Control Solenoid E
P2731Pressure Control Solenoid F
P2756Torque Converter Clutch Pressure Control Solenoid
P2765Input/Turbine Shaft Speed Sensor B Circuit
P2807Pressure Control Solenoid G
P2816Pressure Control Solenoid H
P281FPressure Control Solenoid J
P2828Pressure Control Solenoid K
U0100Lost Communication With ECM/PCM A
U0102Lost Communication With Transfer Case Control Module
U0103Lost Communication With Gear Shift Control Module A
U0104Lost Communication With Cruise Control Module
U0121Lost Communication With Anti-Lock Brake System (ABS) Control Module
U0129Lost Communication With Brake System Control Module
U013CLost Communication With Accelerator Pedal Module
U013CLost Communication With Accelerator Pedal Module
U019ELost Communication With Transmission Range Control Module
U0258Lost Communication With Radio Transceiver
U0293Lost Communication With Hybrid/EV Powertrain Control Module
U0401Invalid Data Received From ECM/PCM A
U0403Invalid Data Received From Transfer Case Control Module
U0404Invalid Data Received From Gear Shift Control Module A
U0405Invalid Data Received From Cruise Control Module
U0415Invalid Data Received From Anti-Lock Brake System (ABS) Control Module
U0418Invalid Data Received From Brake System Control Module
U043DInvalid Data Received From Accelerator Pedal Module
U049FInvalid Data Received From Transmission Range Control Module
U0594Invalid Data Received From Hybrid/EV Powertrain Control Module