Controller LED Indicators

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

Controller LED
Pattern and Color

Meaning

Blank

Power is off.

Solid Red

12 volt bus voltage is low.

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.

Handheld Display LED Indicators

Handheld Display
LED Color

Meaning

Red

One or more active trouble codes.

Yellow

One or more recorded trouble codes.  

Off

No active or recorded trouble codes.

Regulation Fault Codes

Regulation
Fault Code

Meaning

Notes

Possible
Causes

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.


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.

Code

Meaning

Possible Causes

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.

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


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