Q: Problem with auto gear changes

asked by on

Hi I have a Bf xr6 turbo falcon automatic6 speed... now when I accelerate my car shifts first gear to second and then as its about to change to third it gets stuck between 3000 and 4000revs and if I continue to accelerate it keeps climbing in revs and won't change until I use sequential mode .. please help
My car has an automatic transmission.

Hello, What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent by vehicle speed sensors and engine speed sensors. Based on this information, the Engine Control Unit (ECU), or the Transmission Control Unit (TCM), executes the appropriate upshifts and downshifts by sending a signal to one of several shift solenoids. These transmission solenoids have spring-loaded plungers inside them, which are wrapped with wire. When this coil of wire receives an electrical charge from the TCM / ECU, it causes these plungers to open, allowing transmission fluid to flow into the valve body and pressurize the desired clutches and bands. When this happens, the transmission changes gears and you continue down the road. The computer controls the transmission solenoid in several ways. If the vehicle is equipped with a dedicated Transmission Control Unit, it can open or close the hydraulic circuit using a direct 12v signal. In some cases, the Engine Control Unit (ECU) can control the solenoid’s plunger by turning the ground circuit on and off. When this is not working properly, this can cause a jerking reaction, a delay in shifting or in some cases may cause the transmission to hesitate in shifting gears. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your transmission.

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. Problem with auto gear changes

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: My 2014 ford focus whenni hit the lock button on my remote the beep does not sound and the horn does not work either.

Hello, thank you for writing in. The vehicle has a fuse that is specifically for the horn, and you are going to want to check that first. If the fuse is blown, it is a simple fix in which you...

Q: what is optimal operating temperature supposed to be? is 215 too high?

Hey there. 180 is normal for your car. Although 215 shouldn't hurt anything if it only stays there for a minute or so and cools back down, it really should not be getting this hot. There are different thermostats available...

Q: Rattling noise from drivers front wheel and doesnt freely turn

There is an obstruction, or broken part(s) of some sort which could be wheel bearing related, brake related, steering linkage related or possibly even due to faulty axles (CV joints) or rotating elements in your manual transmission. A comprehensive Noise...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.