Q: Check Engine Light with code P0740

asked by on

No issue with transmission car runs great but engine light won't go off

My car has 136000 miles.
My car has an automatic transmission.

There are a number of symptoms that may accompany a P0740 code, it may be that your car will stall at stop lights, or have trouble shifting, or you may not notice anything at all except your gas mileage is off.

P0740 is a code for the torque converter clutch circuit. The torque converter clutch is an automatic clutch built into the torque converter that engages to lock the driving and driven elements of the torque converter together when you are under way. this eliminates the slippage in the converter that older cars had that wasted energy and therefore fuel. The code is for the electrical circuit, so it could be as simple as a connector working loose. Or it could be the beginning of something worse.

Since the car isn’t giving you any trouble now, you may not feel the need to fix this. But it is important to do so, because once the Check Engine Light is on, it can’t warn you if there are any other malfunctions. Plus, a car with an illuminated Check Engine Light will not pass inspection in most states. By contacting YourMechanic you can have a technician come to your home or office to diagnose your Check Engine Light and help you decide what to do next for an accurate repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Check Engine Light with code P0740

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: Why doesnt my car want to crank, and start? Ive been stranded for 4 days please help.

It sounds like your alarm system is what's keeping the car from starting. There is generally an immobilizer built into alarm systems, which will prevent the car from being started if the alarm was set off. Try unlocking the car...

Q: 2010 Ford Fusion SE with I4 Engine - Throttle Position (TP) and Accelerator Pedal Position (APP) sensors

Since the code reads Throttle Body, the sensor on the throttle body under the hood may be the best place to start. The throttle position sensor measures the angle of the throttle plate and tries to match the effort shown...

Q: Check Engine Light is on - trouble code P0420

As you may know, trouble code P0420 relates to the inefficiency of the catalyst system, which detects the presence of oxygen in the exhaust gases. This can be caused by failing O2 sensors that need to be replaced. This can...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.