Q: Transmission does not shift properly

asked by on December 10, 2016

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?
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

Tire rotation and oil change

Hi There, Depending on the type of tires (with rotation marks vs without rotation marks), the tires will be rotated in accordance with manufacturers specifications. Our mechanics are able to do this with the use of a jack and jack...

remote key programming

Hi there. FOB key reprogramming is typically identical for all models of Chevrolet; so you should be able to complete the same process for your Tahoe. If it doesn't work, you should contact your local Chevrolet dealership for detailed instructions...

Car won't start

Hi there. Although the voltage looks good on the battery, the unknown is the cold cranking amps; which is what is important asset of the battery for start up. If the AC was serviced yesterday, the battery cables would have...

Related articles

5 Signs Your Car Isn't Shifting Correctly
Improper shifting is a sign of car transmission problems. The solution might be simple or complex, but get it inspected to avoid expensive repairs.
Is it Safe to Drive With a Slipping Transmission?
The transmission converts the power from the engine into motion so the vehicle can move. Vehicles have either an automatic or manual transmission....
The 10 Transmission Problems to Never Ignore
There’s nothing quite like transmission problems to stress out the average car owner. They are, at best, inconvenient and, at worst, very expensive. Proper...