Q: Vehicle slows down slightly then speed up slightly while driving.

asked by on

Vehicle slows down slightly then speed up slightly while driving. Also when starting from a stop, the vehicle starts to move then slows up slightly then you have to apply more accelerator to get the vehicle to continue to accelerate. The vehicle does not do this at high speeds or is not as noticeable at 70MPH or above.

My car has 49000 miles.
My car has an automatic transmission.

This may be a result of low transmission fluid or potentially a faulty transmission control module. 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 functions 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 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
  1. Home
  2. Questions
  3. Vehicle slows down slightly then speed up slightly 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: i have a ford ranger 2.2 tdci

Hi there. A check engine or warning light is illuminated after the ECU detects and error coming from sensors or electrical components. This will register an OBD-II trouble code and then illuminate the light on the dash. The only way...

Q: i changed my 2012 dodge carvan battery and after that airbag light comes on

It is possible that this could be a fluke malfunction. It is also possible that there could be an actual issue with the airbag system. I would recommend having your airbag system inspected by a qualified professional to determine the...

Q: I have a 2007 buick lacrosse my blower motor seized up and i replaced it but some thing else is wrong hvac fuse is good idk where

Was the blower motor resistor replaced ? It may be the problem. The function of the resistor is to regulate the amount of voltage to the blower motor in order to regulate the speed. If straight voltage was applied to...

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 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...
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.