Question about 1995 GMC Sierra C1500
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Posted on Jan 02, 2017
SOURCE: transmision starts out in 1st
Sounds like your transmission is in limp mode. This is a fault mode in which the
transmission either loses electrical power or the PCM deactivates all of
the electronics. The transmission will default to max line pressure.
The driver will have Reverse and 3rd, with manual 2nd available by
putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC
lockup will not be available. It will not hurt the car to drive it like
this for short periods, but use manual 2nd to get the car moving, and be
aware that the trans will generate more heat than normal while
operating in limp-home mode due to increased torque converter slippage
during 2nd gear starts and no lockup in 3rd gear.
The other from what you described, trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.
Thank you for using fixya and have your Safari scanned for the DTC codes that would indicate what issues your transmission is having to put you in to limp mode.
Posted on Sep 21, 2010
SOURCE: When my 2001 GMC Yukon
this sounds like the pressure valve is going bad on third gear. cheap fix try Lucus transmission additive to increase the pressure.
To do it right go to a good transmission shop an have it serviced and flushed.
Posted on Sep 27, 2010
Change the switch itself if it drives normal then randomally kicks into 4 lo/4 hi i had the same problem and a transmission shop told me it was the vaccum and the transfer case but one of my mechanic friends told me that it was my switch and shops only tell you other things for the money. Try changing the switch.
Posted on Aug 17, 2012
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