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My 2003 gmc sierra 1500 2wd. transmission problem first the truck wouldnt move in drive but you could manualy shift from 1st 2nd 3rd then to drive and would be fine but if you stopped in drive it would not go unless you started over with 1st 2nd 3rd. two days like that and the truck wont move in any gear. i replaced fluid, filter, and did the lucas transmission treatment fluid with no luck. could it be a sending unit or solinoid?
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Valve body. You have a sticking valve. When you manually shift it into first, you force the sticking valve to move(pressure). There could be a couple other problems, But they are still in the valve body.
rec check fluid first. If trans fluid hasn't been changed in last 30,000 miles change fluid, filter and pan gasket. At that time inspect for foreign materials in bottom of pan or on magnet if you have one. If truck has over 100K and fluid was never changed you may have more problems if changing the fluid.
No 3rd or 4th gear: “3-4” clutches are worn out. R&R. The car is safe to drive (in 2) until you can get it fixed.
Trans shifts into gear harshly, car feels sluggish off the line, No
1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only
available gears, CEL is on: Transmission is either in limp-home mode or
has lost electrical power. If there are lots of error codes in the PCM,
check the under hood fuse that powers the transmission, and if it pops
again, look for a short in that circuit like an O2 sensor harness
touching exhaust. Otherwise, check PCM codes for a particular fault in
the transmission causing the PCM to put it in limp-home mode.
No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD
and locks the converter : Shift A solenoid failed. Easy fix in the pan.
Or a wiring problem from PCM to trans.. or PCM.
Check to see if your transmission is in the limp mode, which would only give you 2nd, 3rd and reverse gears. No 1st or 4th gear.
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