P0740 is just one of the most common transmission trouble codes. It means that the Pathfinder‘s computer system has detected that there is an problem with the speak converter clutch (TCC) solenoid circuit.

P0740: talk Converter Clutch Circuit Malfunction

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

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P0740 Symptoms: Nissan Pathfinder

The symptoms of P0740 differ greatly. If the converter remains unlocked, it deserve to be a nuisance. If that locks once it shouldn’t be, that’s where it can obtain dicey.

The most usual symptoms include:

negative Gas Mileage- If the converter is no locking in ~ speed, the engine’s RPM’s will remain higher. This to reduce fuel mileage. Stutters and also Stalls- This would certainly be a symptom that the transmission locking when it should not be. The feels specifically like when you need to downshift in a manual transmission. Greater RPM top top highway- If the converter is no locking, it have the right to lead to greater RPM on the highway. This increases fuel mileage and makes the transmission run at a higher temperature. Business Engine soon Light

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

P0740 reasons Nissan Pathfinder

There are countless different points that can reason the P0740 code. Most of them space going to require an specialists touch come diagnose.

This perform is presented v a mix of most likely to reason the issue and 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 the low infection fluid. The most noticeable one is walk to it is in the transmission slipping.

If the transmission fluid is dirty or burnt, it can make the transmission behave in a way that is not normal and throw the P0740 code. Here’s a pretty an excellent guide on transmission liquid color.

If the fluid is short or bad, replacing need to be thought about an immediate priority. The great news is that transmission fluid and also filters room cheap.

Wiring Issues

The wiring harness that goes to and from the transmission is one of the more vulnerable pieces of wiring on a vehicle. Inspecting the harness for apparent signs that distress, checking the link at the infection itself, and also finally a continuous test deserve to go a long method in diagnosing her Pathfinder.

TCC Solenoid

It is extremely likely that the torque converter clutch solenoid (TCC) has actually gone bad. But, jumping directly to this conclusion there is no inspecting the transmission fluid and also wiring can reason a the majority of undue headache.

Torque Converter

The speak converter itself or speak 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 may be that the problem is in the transmission instance itself. It might be a valve body issue, a difficulty with the press going v the transmission, or a clogged filter.

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Conclusion

Articles on this website are constantly written with the DIY enthusiast in mind. Most of the time, you’re not looking these codes up for casual reading. You’re looking them up to deal with your vehicle. We would never ever want come discourage that. V that gift said, P0740 is a tougher code to diagnose and is often out of the selection of the the shade tree mechanic.

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