P0740 Code
Thread Starter
Teching In
Joined: Feb 2024
Posts: 3
Likes: 0
From: Clarksville
P0740 Code P0740 Torque Converter Clutch Solenoid Circuit/Open Circuit Malfunction
So I changed the internal transmission harness, TCC solenoid, and the PWM solenoid. (5.3 with chopacobra cam with stock converter)
The code still persists. Trans was bought with 160k miles from 2002 trans am/ls1 with no modifications.
I have HP Tuners I commanded the lock up solenoid and still does it.
Next step new torque converter or just get new trans? NEED Help lol
So I changed the internal transmission harness, TCC solenoid, and the PWM solenoid. (5.3 with chopacobra cam with stock converter)
The code still persists. Trans was bought with 160k miles from 2002 trans am/ls1 with no modifications.
I have HP Tuners I commanded the lock up solenoid and still does it.
Next step new torque converter or just get new trans? NEED Help lol
TECH Enthusiast
Joined: Jan 2019
Posts: 677
Likes: 490
From: Roxana, IL
P0740 is an electrical code. Could a wire be pinched or shorted? Loop the cooler lines together and bypass the transmission cooler. If it still stalls the engine, It's internal. Then it will probably need a transmission rebuild including a converter.
