Q: I'm having problems with code po740

asked by on

Hey, I have 2002 Honda Civic 1.7 that I purchased with a bad transmission, I dropped that tramission and put a used one, after I installed the transmission and ran the car check engine light came on and code was po740 torque converter solenoid. The transmission shifted perfectly fine, So I did some research I change the solenoid and ran the car the check engine light came back on, so I checked my wiring and continuity from the solenoid connector to the pcm and the continuity was good, I drain the fluid and put the dealers transmission fluid ran the car again and light came right back againg. So I took the car to a mechanic and explain everything that I did to the car, so we came to the conclusion that it was the torque converter so I dropped the transmission againg and went and got another one since it still had warranty. I installed the other transmission with a new torque converter, took the car for a spin and drove for like 3 miles and the check engine came on with the same code.

My car has 171456 miles.
My car has an automatic transmission.

Hi there. In order to be able to give you more exact information I would need to know whether or not the vehicle is equipped with the CVT transmission. It sounds like you have the regular transmission in your vehicle. If the solenoid is new then you either have a wiring or computer issue. I would definitely make sure that you have the right transmission in the vehicle. If the year is not the correct one then the reading from the solenoid will be incorrect. If it is the right transmission then the wiring to the transmission needs to be checked for any loose or pinched wires. If those are fine then the wiring to the computer and the resistance and the signal from the computer need to be checked. This type of problem on your vehicle is best diagnosed by a transmission specialist.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I'm having problems with code po740

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: my gas cap keeps coming loose causing car to shut off. This only happens when its out side

This one makes me very curious. The car should continue to run whether the gas cap is loose or not. In fact, the car should be able to run with no gas cap at all, but the check engine light...

Q: The engine makes a noise when it is in neutral or when i drive.

Hi there. The noise you are hearing could be the torque converter (automatic) or clutch (manual). The part could be loose or have a balance issue causing the part to move around and make some sort of noise. If the...

Q: Pinging during acceleration

Hi There, Pinging is a result of pre-ignition which means the fuel/air mixture in the cylinder spontaneously explodes, slightly before the spark plug ignites it. There are several things that can cause this to happen. Installing the wrong spark plug...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...