My 2001 S10 4wd Blazer with automatic trans. will not shift properly. When put into drive it will not go into the lowest gear but seems to to be in the highest gear. You can manually put the lever into first gear but when moving the shift lever into 2nd, nothing happens, no shift. When you put it manually into 3rd, it does shift into a higher gear but when you shift into drive, it stays in the previous gear and does not change. When coming to a stop it does not downshift but seems to stay in a higher gear. Also, the check engine light is on.

SOURCE: s10 blazer surges

might wanna check intake gasket for leaks on the high engine rev as for tranny might be in the comp

SOURCE: slight miss in engine, hard shift from 1st to 2nd long 2nd gear

Check both O2 sensor(s) and catalytic coverter.. P0420 means catalyst below threshold. Also check the sensor at the transmission and solenoid.

SOURCE: 2001 automatic chevy truck Z71 not shifting out of 2nd gear

1 st did you fill the transmission after radiator replace ment some lines go to the rad. when you loose fluid it needs to be added and checked. Other wise it sounds like a trans needs to bo serviced.

SOURCE: 2002 chevy hd duramax 4x4

Sounds like the PRNDL switch on the side of the transmission. Be sure and clear the code before trying to start after replacing it.

SOURCE: my 97 chevy blazer won't shift past 3rd gear

Drop the pan, odds are the shift solenoid is out, its located at the front of the trans on the driver side. I'm sure your check engine light is on that will comment about the timing/shift solenoid being bad. I had the same problem with mine. The solenoid had plastic coming out of the inside. To remove it you'll find a small C clip holding it in, just take a small screw driver and pull the clip out. The part cost me like $36 from my local dealership. And its a longer solenoid. I believe its the 3-2 downshift solenoid. I do have the part number if you need it.

Testimonial: "Thank you so much. I actually thought this was the problem, but i didn't know. Thanks again!! send me the part number"