Diagnostic Trouble Codes (DTC's) and LED Indicators

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