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.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing