Skip the auto shop - Our mechanics make house calls

Q: Transmission

asked by on

What would cause my transmission not to go into 1st gear and not down shift
My car has an automatic transmission.

Hello. I will help you with your question about the transmission on your Chevrolet S10. There are both electronic and hydraulic shift controls in your vehicle. A likely cause of the failure to shift or downshift is a valve in the valve body (including solenoid actuated valves) failing or sticking. It is also possible that a hydraulically actuated piston in the transmission that actuates a clutch pack is leaking or an O-ring on a piston has torn or worn out. Pressure testing can reveal some of these issues or at least distinguish between a hydraulic problem versus an electrical control problem. Valve body issues can usually be dealt with without removing the transmission from the vehicle. If it turns out that a piston has failed, essentially the transmission has to be removed and rebuilt. If you would like to have a professional inspect this for you, a certified professional from YourMechanic can come to your car’s location to diagnose the shifting issue and advise you on the right repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Intermittent chirping when driving with AC on

Hi. When the AC compressor is on, it puts a significant load on the belt, tensioner, pulleys and engine. The extra load on these parts could be the cause, or the internals of the compressor could be the source of...

Q: Speedometer and gears failed; car towed - 2009 Kia Borrego

It seems like the problem is one the shop may have not experienced just yet or they may have found a big problem and are trying to work with Kia directly for warranty or recall information. Take the vehicle back...

Q: After shifting into 3rd gear, truck won't accelerate

Hello there, thank you for asking about your 2006 GMC Sierra 1500HD. It sounds like the transmission is slipping. Replacing or rebuilding the transmission is likely the cure. To be certain, I suggest having a professional inspect your vehicle firsthand....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...