Car jumps while driving and has trouble going into gear.

When I start and stop the car it seems to have trouble going into gear. The car also jumps when driving.
Experienced mechanics share their insights in answering this question :
If you have a manual transmission you may have an issue with your clutch. Automatic or manual transmissions can have electrical issues causing gear selection to be difficult. The jump you are referring to sounds like a hard shift. You may have some internal damage to your transmission. I would recommend getting it inspected by an expert.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Automatic transmissions that shift hard, jerk or shake during a shift change may mean your transmission fluid needs changed or fluid level is low. In manual transmission vehicles, abnormal gear shifts could indicate damaged gear synchros, worn clutches or other, more severe issues.
Jumping out of gear may be the result of any number of the internal and external problems. End play or preload problems with individual gears on the mainshaft are two of the most common, although linkage issues, worn bearings, and worn synchronizers can also cause jumping out of gear in certain situations.
The number one cause is the clutch components have worn out and no longer have enough friction material to overcome the weight of the vehicle. A second possibility is the transmission can be stuck in two gears at the same time and it won`t move. The shift mechanism can malfunction and keep you from selecting a gear.
When the transmission has actually gone out, basically your vehicle will not move. This is because the gears can no longer get power from the engine. As a result, the engine will idle, stall, or surge when shifting gears.
A Transmission Fault

Shifting issues can sometimes cause your vehicle to feel like it is jerking when accelerating. If you have internal transmission damage, it can cause the gears to slip [and] engage over and over again, which feels like jerking when accelerating.

When it`s failing, your transmission could give your gear shift an unintended slip to neutral, severely impeding your ability to control your acceleration and, more importantly, deceleration. Your car may feel like it`s struggling to go or isn`t accelerating like it normally does.
This is a common symptom of a plug or wire electrical current problem. Air or Vacuum Hose — Another common cause for engine vibration and power loss is when air or vacuum hoses come loose, begin to leak, or rupture. The three necessities for all combustion engines are air, fuel, and spark.
Clunking, humming or whining sounds are signs of automatic transmission problems. Faulty manual transmissions will also give off loud machinelike sounds that seem to come out of nowhere. A clunking noise when you shift gears is a telltale transmission situation.
But a blown fuse No. 38 becomes a likely candidate causing a loss of power to the transmission solenoids.
Low automatic transmission fluid can cause shaking. If the shaking is accompanied by the check engine light, it`s time to visit a mechanic. Drivers of manual cars might discover their clutch master cylinder is the source of the shaking.
When the transmission jerks between gears or the transmission is shifting hard, it should be taken as a warning that your transmission needs repair. When a transmission is shifting hard or slipping it`s time for an inspection.
Fortunately, fixing a shuddering transmission is often as simple as getting a transmission flush to replace the contaminated transmission fluid with clean, fresh fluid.
If you notice that your car jerks while you`re accelerating, this is an issue that you shouldn`t ignore. A jerking car is often a sign that your car will develop other problems if you don`t address this issue. Dirty fuel injectors are among the most common reasons for why an accelerator becomes jerky.
A car that surges or jerks at high speed is potentially dangerous, especially in heavy traffic or in bad weather. If your vehicle jerks at high speed, you should stop driving it and have it inspected by a mechanic.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My manual car won’t go into gear, it turns on and the clutch goes down perfectly fine. It happened after my gears grinded, the car
ANSWER : If the clutch mechanism is releasing properly, and the shift linkage is not malfunctioning, your transmission will have to be removed from the vehicle and inspected. Once a transmission has been removed from a vehicle, if the problem is a broken or worn part or parts, and the transmission has 100,000 miles or more, the most cost effective approach is to just simply rebuild the whole transmission. There are transmission rebuild kits that are sold just for this purpose. Rebuilding a transmission is no big deal and is indeed easier in many respects than rebuilding an engine. You can rebuild your transmission right in your own garage. You can NOT rebuild an engine in your own garage due to the highly specialized, and extremely costly, machine shop equipment required. Occasionally, mobile mechanics will take on a transmission rebuild job especially as once the mechanic removes the transmission from the vehicle, it is just simply a modular unit that can be easily transported to a mechanic’s shop and rebuilt right there and then returned to your vehicle. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Started Three days a go. When I drive the car it doesn’t go in to gears but shows AT.
ANSWER : This kind of reaction is often a sign of low transmission fluid or a faulty transmission control solenoid. 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. This type of problem is amplified any time the transmission is low on fluid creating a drop in hydraulic pressure. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

While driving, car jumps into lower gears unexpectedly almost coming to a stop. Then the car jumps back into higher gear at random intervals.
ANSWER : Hi there. Sounds like the kick down solenoid is sticking and not functioning correctly. The kick down solenoid make the circuit within the transmission valve body (transmission controller) to down shift when under heavy acceleration to allow a lower gear to be engaged. What is happening is the solenoid is operating without the throttle demand. I recommend replacing the kick down solenoid and checking the throttle position sensor (TPS) for its working properly. If you need further assistance with your transmission going into lower gears unexpectedly, then seek out a professional, such as one from Your Mechanic, to help you.

When I’m driving, sometimes the car over revs and jerks when I shift gears after the cars been on for a while
ANSWER : Hi There,
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. I would recommend having a professional from YourMechanic come to your location to diagnose and inspect your transmission.

Shifting from 2nd to 3rd, car stopped going fast. Now it won’t go at all.
ANSWER : It is possible that your clutch has failed. The sound you are hearing is likely due to the clutch not engaging with the engine due to it being worn. I would recommened having your transmission inspected by a qualified transmission expert to determine if your clutch requires replacement in order to resolve this issue. This inspection may require removal and partial disassembly of the transmission in order to verify that the clutch has failed.

i have problem about runx this car when try to drive actually when i put gear position D car is going slowly then when try go spea
ANSWER : If you have a 2017 Toyota vehicle that his having acceleration issues and are having to use public transportation to get around, I would recommend taking the vehicle back to the Toyota dealership for service immediately. This vehicle is still under warranty and any issue you are having with the powertrain should be fixed free of charge. It is not even 2017 yet so there is no reason what so ever that this vehicle should have any issues with the engine.

Car won’t go into gear. 2002 Audi A4 Quattro
ANSWER : Hi there – Your symptoms describe the behavior to expect when your clutch hydraulics go out (clutch master and clutch slave cylinders). Check your clutch fluid level – it may be low. If the fluid level is low, this usually means your clutch slave cylinder has worn out, not unusual with your mileage, and should be replaced. I recommend a malfunctioning clutch inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

My car gear does not engage to drive position.
ANSWER : Hi there:

Sometimes this issue is caused by a faulty shift solenoid attached to the transmission; while in other instances, it can be caused by low transmission fluid or other damage inside the transmission. The best thing to do is have a professional mechanic complete a car is hard to shift inspection, so they can determine what is causing this problem and recommend the right repairs.