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

trany solenoids

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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