P0740 is just one of the most usual transmission problem codes. It means that the TL‘s computer system has detected that there is an concern with the talk converter clutch (TCC) solenoid circuit.

P0740: talk Converter Clutch Circuit Malfunction

The TCC “locks” the drivetrain, which permits for a true mechanically connection between the transmission and also the engine. In effect, this allows an automatic infection to function like a hands-on transmission at certain speeds and also engine loads, and eliminates every slipping indigenous the transmission.

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P0740 Symptoms: Acura TL

The symptoms of P0740 differ greatly. If the converter continues to be unlocked, it can be a nuisance. If that locks as soon as it shouldn’t be, that’s wherein it can get dicey.

The most typical symptoms include:

poor Gas Mileage- If the converter is not locking in ~ speed, the engine’s RPM’s will remain higher. This reduce fuel mileage. Stutters and Stalls- This would certainly be a symptom that the infection locking as soon as it have to not be. That feels exactly like when you need to downshift in a hands-on transmission. Higher RPM top top highway- If the converter is not locking, it have the right to lead to greater RPM on the highway. This increases fuel mileage and makes the transmission operate at a greater temperature. Service Engine soon Light

Here’s a an excellent video on diagnosing this code:

P0740 reasons Acura TL

There are countless different points that can cause the P0740 code. Many of them space going to need an specialists touch come diagnose.

This perform is presented with a combination of likely to reason the issue and also repairability in mental first.


Transmission Fluid

If over there isn’t enough transmission fluid, the transmission will not have the ability to operate normally. There are many symptoms of low infection fluid. The most noticeable one is walk to be the infection slipping.

If the transmission fluid is dirty or burnt, it have the right to make the infection behave in a way that is not normal and also throw the P0740 code. Here’s a pretty great guide ~ above transmission fluid color.

If the fluid is short or bad, replacing should be taken into consideration an urgent priority. The an excellent news is that transmission fluid and filters are cheap.

Wiring Issues

The wiring harness the goes to and from the transmission is just one of the much more vulnerable piece of wiring top top a vehicle. Inspecting the exploit for apparent signs the distress, check the link at the infection itself, and finally a continuous test can go a long method in diagnosing your TL.

TCC Solenoid

It is highly likely the the torque converter clutch solenoid (TCC) has actually gone bad. But, jumping directly to this conclusion without inspecting the transmission fluid and wiring can reason a lot of undue headache.

Torque Converter

The speak converter chin or talk converter clutch deserve to go bad and also throw the P0740 code.

Problem in the Case

If the TCC appears to it is in functioning properly, it might be the the difficulty is in the transmission instance itself. It can be a valve body issue, a problem with the push going with the transmission, or a clogged filter.

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Articles on this site are constantly written with the DIY enthusiast in mind. Most of the time, you’re not looking this codes up because that casual reading. You’re spring them increase to solve your vehicle. We would never want to discourage that. Through that gift said, P0740 is a tougher password to diagnose and is often out that the variety of the the shade tree mechanic.

If there is anything the you would favor to add, please feel totally free to leave a comment.