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?
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. 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: Interior lights work but car won't start and power locks won't work 97 Honda passport

You possibly have a dead battery. Batteries that are "partly" dead can often still run lights, dash lights and so forth but will not have enough power to run the starter motor and start the car. The very first thing...

Q: Check Engine Light is on - 2012 Nissan Xterra

Anytime a code is stored, it will stay stored and the Check Engine Light will stay on until the ECM memory is cleared. If the problem is fixed, then the light and code should not come back. Many times a...

Q: Q: Limp mode

If you do not use the recommended fluid for Chrysler or any transmissions in general, it can cause the transmission to have shifting and slipping concerns. Even damage can be caused from incorrect fluids being used. This is why I...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...