Q: Slip's out of gear

asked by on December 29, 2016

While the car is cold no problems. Once the car warms up I will lose all gears. I have to turn the car off and back on and all's well. After a few minutes all gears go at once. Turn the car off and back on the gears are back. I have checked the fluid while warm, running,in neutral with E break on. Fluids are perfect. There is no check engine or transmission light on. And all this started happening at once.

My car has 209452 miles.
My car has an automatic transmission.

If the filter has never been changed you could try that. When cold, debris has dropped to the pan. Once you start the vehicle, the filter screen can get blocked as fluid is drawn into the filter by pump suction. Of course, if the filter screen is blocked, there will be insufficient hydraulic pressure and the transmission simply will not work. Apart from a blocked filter, there are two main categories that would be diagnosed: electrical controls, including the transmission control module and the shift control devices such as solenoids, and the hydraulic control system, particularly the pump and valve body. With regard to the hydraulic control system, heat could even be causing the valve body to leak if the valve body is loose or distorted. Those sorts of issues are detectable by looking at hydraulic pressures (via external gauges) as the transmission runs. Based on what you are describing you will probably see one or more gauge readings that are way out of spec thus providing a clue as to where the fault is. You could monitor these hydraulic pressures when the transmission is cold and see how the pressure changes at the point at which the gears drop out. If you desire that a certified mechanic identify the root cause(s) of this failure to engage in gear and shift, simply contact YourMechanic and request a transmission diagnostic.

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

What others are asking

Changed camshaft sensor but car still won't start, could it be the crankshaft sensor?

Hello, thanks for writing in. Most of the time, this code comes up when there is a difference between the crank and cam sensors. The most common failure is the crankshaft position sensor. These fail much more frequently than the...

will a temperture switch cause an engine not to start?

The engine coolant temperature sensor sill not cause the engine to die or not start, but can cause the fuel system to go full rich. The engine dies when getting hot is most likely due to an ignition spark loss...

My 1977 chevy c10 is accelerating after i put it in park. And when i switch gear to drive it accelerates without me pushing on gas

The possible causes of this are a vacuum leak, a stuck throttle plate, or an improperly adjusted carburetor or throttle linkage (or binding linkage). If you desire a diagnostic, and the required repairs, please schedule service using YourMechanic's engine idle...

Vacuum diagram

The vacuum diagram is in a .jpeg or .pdf format and cannot be attached to this response. Please note that the complete Factory Service Manual (FSM) for your vehicle, including the vacuum and wiring diagrams, is available on Ebay at...

Shift link or axle issue

Hello, thanks for your question. From what you describe it would appear that your vehicle has suffered some sort of transmission-related mechanical issue. Transmission grinding and popping is usually an indicator that the transmission has developed some sort of internal...

Car shakes and vibrates

A concern like this can be produced by a number of different things. Such as; a large vacuum leak in the intake system, lack of airflow to the intake system, lack of fuel delivery caused by a failing fuel pump,...

Service ABS/Traction control/Active Handling messages on DIC

Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the ECU...

Mass Air Flow replacement and problems with a fast idle

This may be related to a dirty or faulty idle air control valve. As you may know, this works similarly to the mass air flow sensor in that it relays air information to the computer which then makes adjustments to...

Car wont turn over battery is good

It sounds like you may be having an issue with your starter. I would recommend having your starter professionally tested with a digital multimeter. This test will determine if battery power is reaching the starter. If battery power is reaching...

Related articles

How to Get Chevrolet Dealership Certified
Chevrolet car dealerships offer automotive technician jobs to mechanics who are certified through the many training programs available.
How an Automatic Transmission Works
An An automatic transmission allows a vehicle engine to operate within a narrow speed range, just like a manual transmission does. As the engine achieves higher degrees of torque (torque is the rotational power of the engine), the gears in...
A Buyer’s Guide to the 2013 Chevrolet Spark
The The Chevy Spark nimbly walks the line between being functional and being totally adorable. In the spirit of mini cars past like the Ford Festiva and the Yugo, this spritely little creation offers improved safety combined with the tech...