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Hummer 4wd service light reset Questions & Answers - Fixya
www.fixya.com > Forum > Tags > 4wd service light reset Hummer h2 2003 55000 mill ... service 4wd the liht is on all time Remote the battery wire from the car for 20 ... My 2006 H3 will not come out of 4 wheel drive?
I had this problem with my 3002 H2, it was the transfer case. The OEM Transfer case has a plastic shifting fork. this wears out and eventually will cause the transmission to go out, I purchased a re-built transfer case on-line of $700.00 and had it installed for $500.00. problem solved....and the re-built has no plastic shifting forks.
The Hummer H2 and H3 are both all time 4WD. There is no way to put it in 2WD. Now, you can select 4WD High or 4WD Low. You can also, if your vehicle is equipped with it, lock the front or rear wheels through the differential selector. This is one of the primary reasons Hummers get terrible gas mileage is because they are always in 4WD. The only other solution is to swap the transmission to an Allison 6Spd, which is often done with diesel conversions, and they usually give you a 2WD option, and can get up to 25 MPG out of an H2.......but that conversion is about $30k.
Hummers are 4WD all the time, you can never take it out of 4WD. Now, you can select between locked 4WD HIGH and locked 4WD LOW. Those are switched by putting the vehicle in Neutral, and pushing the button the dash, waiting till the correct indicator light illuminates and then putting the truck in drive. Based on the above info, what exactly kind of 4WD drive problem are you having?
Use 2 wheels, the other 4wd low ,for climbing at slow speeds: 4wd high, for driving on low traction roads,like mud or snow,at medium speeds: 4wd auto full time all wheel drive, for highway speeds on slippery surfaces, like rain or light snow.