Goes through all the gears smoothly but slips going into overdrive , never slipped before
Its the overdrive sensor 3rd gear you will slip with 4speed band trans
This overdrive gear setting if your sensor is not kicking in then you are due for trans maintenance as 3rd gear is shredding slowly away learned this from dirt track quarter mile super stock racing pray that your gear is intact as a trans shop with micro snake cam can only determine the length of time you have on your gears and trans inspections are free threw amco certified shops
SOURCE: Engine Light on. Dealership says fan clutch is Slipping
Work for GM dealership.The fan can be replaced anytime and a pcm reflash can also be done anytime.If the service engine soon lamp is on because of cooling fan code it is broke!!!!! As far as the price sounds about right
SOURCE: I have a 2003 GMC Envoy, trans slipping that I have been towing
Low fluid can cause slipping. (depends upon how low) Most manufacturers post "safe" tow speeds. These are generally ignored. (not good). I recommend towing with driveshafts removed and where driveshaft has a "slip yoke" you install a yoke from a scrapyard and wire it to the tailshaft so it stays in place (keeps oil in and dirt out) Although you can't just detach the tow-bar and drive, it eliminates any possibility of trans damage, since the transmission cannot turn. (most use oil from pump to keep gearsets cool...when towing, pump is not pumping and over time and distance it can damage trans internals.)
Hope your problem is just low fluid and not a rebuild...keep in mind what I said though.
SOURCE: My 2002 GMC Envoy transmission slips into neutral
try adding fluid and if still slipping neeed to have it checked could just need a fluid change
SOURCE: 2002 GMC Envoy Coil Packs / Coil Module Assembly's going bad
swap it with another and check the code again to ensure that it is coil pack 3. This car doesn't have adiquate sensors to diagnose this properly and may indicate the wrong coil. Yes this is comon, its happened to me and I have the same make and model.
SOURCE: transmission slipping on 03 GMC Envoy. what does iy mean when trans fluid measure high on dip stick?
Two things: #1 someone has overfilled it by mistake thinking they were putting oil in the engine. Yes I have seen this.
#2 The transmission cooler in the radiator could be leaking antifreeze into the transmission through the cooling line raising the fluid level. I would look for milk shake foam on the dip stick and make sure you check trans in park and not neutral.
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