P2740 OBD-II Trouble Code: Transmission Fluid Temperature Sensor B Circuit

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2740 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2740 code

P2740 is a diagnostic trouble code (DTC) for "Transmission Fluid Temperature Sensor B Circuit". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2740 DIAGNOSTIC Get a fair and transparent estimate upfront

P2740 code definition

The P2740 Trouble Code indicates a problem with the trans fluid temp sensor B circuit.

What the P2740 code means

The powertrain control module has found that the transmission temperature, or the temperature sensor, is reading levels that are not within the limit put in place by the manufacturers.

What causes the P2740 code?

The following are the most common causes if the P2740 code:

What are the symptoms of the P2740 code?

One of the first things you will notice is that the Check Engine Light will come on and not go off. Many times, you will also smell transmission fluid that is overheated. The transmission could also smoke as well. When driving, you could notice that the transmission has trouble engaging, or that the transmission slips. All of these are bad signs and indicate that you need to get the vehicle to a mechanic as soon as you can.

How does a mechanic diagnose the P2740 code?

The mechanic will use an OBD-II scanner and connect it to the vehicle. They gather data from the onboard computer and they will use that to help them with their diagnosis. The information can help them get a better idea of what is really wrong with the vehicle. The mechanic will want to pay special attention to the vehicle’s transmission to make sure that they do not miss any issues.

Common mistakes when diagnosing the P2740 code

One of the big mistakes that mechanics make when they have the P2740 code is to believe that it is due to low transmission fluid levels or a leaking transmission. While it is true that this is one of the leading causes for the code to be present, that doesn’t mean that there aren’t also other issues with the transmission that need to be taken care of. They need to examine the transmission thoroughly.

How serious is the P2740 code?

Your transmission is essential for your vehicle to run properly, so it is not something you want to put off. When you have codes that deal with your transmission, it is important to get them taken care of right away. With the P2740 code, you will generally realize that you have problems with the transmission right away. Take the time to bring the vehicle directly to a mechanic who can diagnose the problem and make the needed repairs to the vehicles. If your transmission starts slipping, it is a sign of serious trouble. If the transmission goes out entirely, you will not be driving your vehicle.

What repairs can fix the P2740 code?

The following are some repairs that might be needed in order to fix the P2740 code:

  • The mechanic can use an OBD-II scanner to diagnose the vehicle. This ensures that the code is legitimate.

  • Check for transmission fluid leaks and low fluid levels.

  • Check wiring and connections. Make any needed repairs.

  • Rebuild or replace the transmission.

  • The powertrain control module could be at fault, although this is a rare occurrence.

Additional comments for consideration regarding the P2740 code

When a vehicle gets to be a certain age or has a substantial number of miles on it, there is always the chance that the powertrain control module might have some codes stored that aren’t actual problems. They may have been stored by mistake. However, you can’t trust in this. It is important that you always take your vehicle to a mechanic to get checked out. With the P2740 code, you are dealing with your transmission. If the transmission has a problem that isn’t fixed, it could become a serious issue.

Need help with a P2740 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

trouble codes
Check Engine Light
P2740

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2740 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,743

Rating Summary
4,361
185
47
28
122
4,361
185
47
28
122

Oreste

12 years of experience
108 reviews
Oreste
12 years of experience
Nissan Altima - Check Engine Light is on - Hialeah, Florida
Showed up quick, and went straight to inspecting a brake light on the dash issue. He found the issue, fixed it, and showed me exactly what was wrong. Thank you!

Daniel

9 years of experience
58 reviews
Daniel
9 years of experience
Honda Fit - Check Engine Light is on - Chicago, Illinois
Told me everything I needed to know and switch out after the inspection. So, I scheduled another service the next day for all the fixes, or fluid maintenance.

Patrick

31 years of experience
1032 reviews
Patrick
31 years of experience
Hyundai Santa Fe - Check Engine Light is on - Austin, Texas
Even after working on my car, he took the time to explain what he did, the parts, and any next steps. Very knowledgeable!

Joe

12 years of experience
22 reviews
Joe
12 years of experience
Toyota 4Runner - Check Engine Light is on - Sacramento, California
Joe was very thorough in his inspections, and his knowledge & experience was clear in his explanations of what was wrong with my car. I really appreciated his recommendations, and the fact that he worked so efficiently that it cut down on time... I would definitely book with him again.

More related articles

How Long Does a Fuel Filler Neck Last?
Getting Getting gas from the pump to your gas tank is the only way to keep a car going. The fuel filler neck is a metal tube that is welded to the gas tank of a car. The gas cap...
How Long Does a Throttle Return Spring Last?
Not Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that is attached to the accelerator pedal, and runs...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of...

Related questions

Check Engine Light with code P0740

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...

Key won't turn, Check Engine light on.

If it is the correct key and it is inserted all of the way in, then most likely the cylinder is bad. Wiggle the key around while trying to turn it. It may eventually unlock and turn, but this problem...

power shuts down,but will run and drive very slow

For issues like this you should have the system computer scanned and have any codes diagnosed by a mechanic. The cost to have the problem properly diagnosed far out weighs throwing parts at the problem hoping to fix it. The...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com