P0740 obd2 code analysis and how to verify the torque converter solenoid for gm engine code
Checking the P0740 gm engine code means testing the trany torque converter system including the solenoids and wirings. Please go over our lists of more gm engine codes as displayed below
P0740 GM Transmission converter clutch system failure
Since this is also a gm trany problem, test this code by getting a complete wiring diagram of the trany electronic circuit. Once you have it and identified the location and colors of the torque converter solenoids/module, it is a matter of measuring the resistance of the TCC solenoid and comparing it to all solenoids. If defective, it is will either show open or shorted connection. Don't forget the basics like checking the wires for integrity of insulation and routing (making sure the wires are not rubbing a metal or being burnt by the exhaust). If there is a chance that the solenoid needs to be replaced, drop the transmission oil pan so you can verify for signs of debris.
TIPS for verifying transmission wiring circuits:
1.) To manually test your transmission code, check your TCC solenoid before replacing it. This can be done by feeding direct battery voltage on the supply side of the transmission solenoid and you should hear it click. Also try to test the connections between the TCC module and the engine (ecm) module.
2.) If you are troubleshooting a gm engine code like listed above, get hold of transmission wiring diagram before touching any transmission solenoids. This way, you can pin point the correct transmission solenoid connections and prevent damage to the transmission.
CODE Description of transmission code
P0927
Transmission Gear Shf Actuator ckt
P0928 Transmission Gear Shf Solenoid ckt
P0929 Transmission Gear Shf Solenoid ckt
P0930 Transmission Gear Shf Solenoid ckt
P0931 Transmission Gear Shf Solenoid ckt
P0932 Transmission Hydraulic Press Sensor
ckt
P0933 Transmission Hydraulic Press Sensor
P0934 Transmission Hydraulic Press Sensor
ckt
P0935 Transmission Hydraulic Press Sensor
ckt
P0936 Transmission Hydraulic Press Sensor
ckt
P0937 Transmission Hydraulic Oil Temp Sensor
ckt
P0938 Transmission Hydraulic Oil Temp Sensor
P0939 Transmission Hydraulic Oil Temp Sensor
ckt
P0940 Transmission Hydraulic Oil Temp Sensor
ckt
P0941 Transmission Hydraulic Oil Temp Sensor
ckt
P0942 Transmission Hydraulic Press Unit
P0943 Transmission Hydraulic Press Unit
P0944 Transmission Hydraulic Press Unit
P0945 Transmission Hydraulic Pump Relay
ckt
P0946 Transmission Hydraulic Pump Relay
ckt
P0947 Transmission Hydraulic Pump Relay
ckt
P0948 Transmission Hydraulic Pump Relay
ckt
P0949 Transmission Auto Shf Manual
P0950 Transmission Auto Shf Manual cntl
ckt
P0951 Transmission Auto Shf Manual cntl
ckt
P0952 Transmission Auto Shf Manual cntl
ckt
P0953 Transmission Auto Shf Manual cntl
ckt
P0954 Transmission Auto Shf Manual cntl
ckt
P0955 Transmission Auto Shf Manual mode
ckt
P0956 Transmission Auto Shf Manual mode
ckt
P0957 Transmission Auto Shf Manual mode
ckt
P0958 Transmission Auto Shf Manual mode
ckt
P0959 Transmission Auto Shf Manual mode
ckt
P0960 Transmission Press Cntl Solenoid ckt
P0961 Transmission Press Cntl Solenoid ckt
P0962 Transmission Press Cntl Solenoid ckt
P0963 Transmission Press Cntl Solenoid ckt
P0964 Transmission Press Cntl Solenoid ckt
P0965 Transmission Press Cntl Solenoid ckt
P0966 Transmission Press Cntl Solenoid ckt
P0967 Transmission Press Cntl Solenoid ckt
P0968 Transmission Press cntl Solenoid ckt
P0969 Transmission Press Cntl Solenoid ckt
P0970 Transmission Press Cntl Solenoid ckt
P0971 Transmission Press Cntl Solenoid ckt
P0972 Transmission Shf Solenoid Cntl ckt
P0973 Transmission Shf Solenoid Cntl ckt
P0974 Transmission Shf Solenoid Cntl ckt
P0975 Transmission Shf Solenoid Cntl ckt
P0976 Transmission Shf Solenoid Cntl ckt
P0977 Transmission Shf Solenoid Cntl ckt
P0978 Transmission Shf Solenoid Cntl ckt
P0979 Transmission Shf Solenoid Cntl ckt
P0980 Transmission Shf Solenoid Cntl ckt
P0981 Transmission Shf Solenoid Cntl ckt
P0982 Transmission Shf Solenoid Cntl ckt
P0983 Transmission Shf Solenoid Cntl ckt
P0984 Transmission Shf Solenoid Cntl ckt
P0985 Transmission Shf Solenoid Cntl ckt
P0986 Transmission Shf Solenoid Cntl ckt
P0987 Transmission Fluid Press Sensor ckt
P0988 Transmission Fluid Press Sensor ckt
P0989 Transmission Fluid Press Sensor ckt
P0990 Transmission Fluid Press Sensor ckt
P0991 Transmission Fluid Press ckt
P0992 Transmission Fluid Press Sensor ckt
P0993 Transmission Fluid Press Sensor ckt
P0994 Transmission Fluid Press Sensor ckt
P0995 Transmission Fluid Press Sensor ckt
P0996 Transmission Fluid Press Sensor ckt
P0997 Transmission Shf Solenoid Cntl ckt
P0998 Transmission Shf Solenoid Cntl ckt
P0999 Transmission Shf Solenoid Cntl ckt
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