Q: Transmission does not shift properly

asked by on

My car rpm goes up tp 3 or 4 at 10 mph. Was told it was fluids had it drained and refilled replaces filter now told its the ignition coils

My car has 212000 miles.
My car's transmission is unknown to me.

The ignition coils do not have anything to do with the function of the transmission. The symptoms you describe suggest you may have a failing transmission control solenoid or a failing transmission control module. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car’s computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear. When this is faulty or not working properly, this can cause a delay in gear shifting or in some cases cause the car to not shift at all.

A faulty transmission control module may cause a delay in acceleration or erratic shifting of gears. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other components controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission shifting problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Transmission does not shift properly

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: Temperature gauge moves up and down rapidly (does'nt jump).

The wire yl/lb from the PCM to the coolant temperature sensor seems to have a break in it. However, when jumping the wire from the PCM to the sensor could have been in contact with another circuit causing the gauge...

Q: Key not releasing from ignition

Hello. You appear to have a worn safety shifter position switch, which requires the transmission be in Park to remove the key. Move the shift lever a few times firmly into the Park position, and re-enter your key. There is...

Q: I'm buying a used 2004 g35 coupe sport with 107k miles from a private seller but I'm not sure weather the car will work in the lon

Hi there. The problem with purchasing a mid-level luxury vehicle like an Infinity is that they are often overpriced vs. the actual value of the vehicle. Anytime you purchase a used vehicle from a private owner, it's a great idea...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...