Skip the auto shop - Our mechanics make house calls

Q: my car dont shift in high gears, but the transmission is good.

asked by on

I put my car on a machine and I needed a throttle sensor. I put a new one on. About a week ago my car's rpms went up high and it didn't want to shift into third and fourth gear. My transmission is good. My question: is it the transmission speed sensor???
My car has 160000 miles.
My car has an automatic transmission.

A: Hello. There are quite a few different part...

Hello. There are quite a few different parts that can cause this. It can be a transmission speed sensor, but a bad or defective throttle sensor can also cause this. If this started right after the throttle sensor was replaced, then you need to check and see if it is mounted and adjusted right. I typically use a computer scan tool to monitor the sensor reading, while pressing on the accelerator pedal to see if the sensor is reading correctly. If it is, then that is not the issue. From that point, I would need to check the output of the vehicle speed sensor, and check the transmission module for codes. That may show something different, such as a problem with a shift solenoid. It can also be caused by a voltage issue, or a blown fuse for the transmission supply voltage. My main concern would be if this occurred right after the throttle sensor was replaced. If this is something that you were looking to have checked, have a certified mechanic come to you to diagnose the issue of your car not shifting in high gears.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: Transmission flush vs fluid exchange and filter change 2012 Jeep Grand Cherokee

Hello - the "to change, or not to change" transmission fluid is a somewhat controversial discussion, especially in the day of claimed "lifetime lubricants". In my experience, when you plan to keep a vehicle well past 100K, it is a...

Q: I replaced the IAC and EGRVCS - the idle eventually worsens and dies

Hi there. You will need to check the mass air flow (MAF) sensor for if it is plugged in and dirty. If there is nothing wrong with the MAF, I recommend replacing it for the symptoms that you are encountering...

Q: How do you use the personal lights in the rear?

Rear personal lights are only available with the sedan version of the Altima. They’re located in the back, near the top of the door on each side. They’re designed to work like the map lights in the front of the...

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 Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.