Q: My 2003 BMW 330Xi recently started taching much higher than usual while driving.

asked by on

I can be moving and then give it some gas, it is not nearly as responsive as it was and will top out around 4K and then gradually pick up speed. I am guessing a transmission issue, but I am not sure since it does engage fine, just does not seem to shift when it should

My car has 179000 miles.
My car has an automatic transmission.

This may indicate a failing speed sensor. The transmission speed sensor is a magnetic sensor that provides information related to the speed of the input and output shafts in the transmission, allowing the transmission to shift smoothly. The sensor counts the internal number of revolutions of the transmission and transmits that information to the transmission control unit, where the data is used to determine the rotational speed. As the rotation increases, the control unit directs the changing of gears. When this is not working properly, this may cause the transmission to shift erratically or in some cases not at all. I would recommend having an expert from YourMechanic come to your location to take the car for a test drive to more specifically determine the cause for this.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My 2003 BMW 330Xi recently started taching much higher than usual while driving.

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: Q: Check Engine light came on

Multiple lights may be caused by multiple problems.Your BMW has a few dozen computers which can trigger warning lights to appear on your dash. Diagnosing multiple problems may be time extensive, but can be performed by a qualified technician with...

Q: How to keep my car run well for years?

Hi, thanks for writing in. I would suggest following the preventative maintenance schedule located in your owner's manual. Vehicle manufactures provide these for owners to follow to ensure the longevity of each vehicle. Some basic preventative items include, but are...

Q: Car ride is bumpy

Hello there. I will be happy to assist you. A classic sign of a broken strut spring is a very bumpy ride. As you know vehicles are very heavy and roads have bumps and are not paved straight. The heavy...

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 Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...