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

P0740: talk Converter Clutch Circuit Malfunction

The TCC “locks” the drivetrain, which allows for a true mechanical connection between the transmission and the engine. In effect, this allows an automatic transmission to role like a manual transmission at details speeds and engine loads, and eliminates every slipping indigenous the transmission.

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P0740 Symptoms: Honda Civic

The symptom of P0740 vary greatly. If the converter stays unlocked, it have the right to be a nuisance. If that locks as soon as it shouldn’t be, that’s wherein it can obtain dicey.

The most common symptoms include:

poor Gas Mileage- If the converter is not locking in ~ speed, the engine’s RPM’s will stay higher. This decreases fuel mileage. Stutters and Stalls- This would certainly be a symptom of the infection locking when it need to not be. The feels precisely like when you have to downshift in a manual transmission. Higher RPM top top highway- If the converter is not locking, it have the right to lead to higher RPM ~ above the highway. This boosts fuel mileage and also makes the transmission run at a higher temperature. Company Engine soon Light

Here’s a good video ~ above diagnosing this code:

P0740 reasons Honda Civic

There are plenty of different things that can reason the P0740 code. Many of them space going to need an specialists touch come diagnose.

This perform is presented v a mix of most likely to reason the issue and also repairability in psychic first.

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Transmission Fluid

If over there isn’t enough transmission fluid, the transmission will certainly not be able to operate normally. Over there are countless 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 deserve to make the infection behave in a means that is no normal and also throw the P0740 code. Here’s a pretty an excellent guide on transmission liquid color.

If the fluid is low or bad, replacing have to be thought about an urgent priority. The good news is that transmission fluid and also filters room cheap.

Wiring Issues

The wiring harness that goes to and from the transmission is just one of the more vulnerable piece of wiring on a vehicle. Inspecting the exploit for apparent signs that distress, check the connection at the infection itself, and finally a continuity test can go a long method in diagnosing her Civic.

TCC Solenoid

It is very likely that the talk converter clutch solenoid (TCC) has gone bad. But, jumping directly to this conclusion there is no inspecting the infection fluid and wiring can cause a the majority of undue headache.

Torque Converter

The torque converter itself or torque converter clutch have the right to go bad and throw the P0740 code.

Problem in the Case

If the TCC appears to be functioning properly, it may be the the trouble is in the transmission case itself. It might be a valve human body issue, a problem with the pressure going v the transmission, or a clogged filter.

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Conclusion

Articles on this site are always written with the DIY enthusiast in mind. Many of the time, you’re no looking these codes up for casual reading. You’re spring them up to settle your vehicle. We would never want to discourage that. V that being said, P0740 is a tougher password to diagnose and also is frequently out that the selection of the the shade tree mechanic.

If over there is anything the you would prefer to add, please feel cost-free to leave a comment.