97 Yukon wont shift passed 1st - Cars & Trucks

Check the transmission fluid level with the vehicle idling in park. If you do not see fluid on the dipstick then add one half quart at a time until it is in the hash marks on the dip stick. be sure to let the transmission (DexIII or mercon) completely drain down the dipstick tube or you will get a false reading. Shut off engine to avoid having to warm up the transmission to get an accurate reading and possibly causing (more) damage then may already have been done.

Transmission shop. Let them run a diagnostic on it.

Your code is a PO785 is a SHIFT TIMING SOLENOID BANK A wich is a transmission code nothing to do with your smog failure so go to your local auto store and buy this product it's called guaranteed to pass this will get u buy the bs emissions test for 10 bucks regards Chris

Check your transmission sensors with a network diagnostics. These are often to go bad, they also play a big role when it comes to shifting properly.

HERE WE ARE AGAIN STILL SAME ISSUES AFTER CHANGING ALL 5 SOLENOIDS,FLUID,FILTER AND EVEN THE INTERNAL WIRING HARNESS IN 4L60 TRANSMISSION IN A 97 YUKON. STILL GETTING A P0785 CODE. WHEN 1ST STARTED SHIFT PERFECT TILL IT WARMED UP AND I MAKE A COMPLETE STOP. THEN IT WON'T DOWN SHIFT AT ALL AND I HAVE NO OVERDRIVE. HAVE NEVER HAD ANY PROBLEMS WITH TRANS TILL IT STARTED DOING THIS OUT OF THE BLUE. NO SLIPPAGE NO BURNT FLUID EITHER. I'M TOTALLY LOST AND DON'T WHAT ELSE TO DO. CAN ANYONE PLEASE POINT ME IN THE RIGHT DIRECTION? PLEASE EMAIL [email protected]

You can put the shifter in 2, 3, or overdrive. It will still start in first and shift up to whatever gear you have selected. Try it, you wont damage anythingl

Does this bad boy stay inside a garage or out in the open? what is the temp at night at your location?

I don't think its plug wires. When you say it won't shift into 1st? It takes off in 2nd? Does it shift to 3rd and 4th? Or is it a shifter problem? Like it won't go into manual 1st

My guess truck wont move in forward gear. if moves when shifts to 1 or low bad forward sprag in trans if under 50000 mi contact GM get customer good will for defective part, This all true if you have a 4l60e or 4l65e trans

Hi amberdawn_84

My 97 yukon did the same thing (I believe). The valve body in the transmisson wears out (design problem) and causes the transmission to shift really hard. My repair was about $500 (nondealer).
LOVE MY YUKON!