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My 2005 hummer h2 will not shift into 4wd high or low the 4wd button for everyday driving is lit up but when I try and go to 4wd high or low or lock it just flashes the light and nothing happens

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When the 4WD lights flash on and off, this indicates that there are 4WD-related trouble codes in the 4WD control module. Sometimes 4WD lights never illuminate.
The first step in diagnosing the system is to establish communication and retrieve trouble codes from the control module. After retrieving the codes, write them down, clear the codes and retest to see which codes are regenerated. False codes can be set if a component is disconnected when the key is turned on.
If the 4WD lights flash on and off, and no codes are found in the 4WD control module, try clearing the codes anyway. After a certain amount of key cycles, the codes will normally clear from the 4WD control module, but the module will not respond to commands until it is re-initialized by clearing the codes or disconnecting the battery to erase its memory.
If your scan tool will not communicate with the 4WD module, first verify that the scan tool has the proper software and the latest updates. If it does, then try another scan tool. If it still has no communication, the power and grounds that are supplied to the module will need to be tested. See if the scan tool will communicate with the other modules on the shared communication network. If they're OK, check the harness from the data link connector (DLC) for an open circuit to the 4WD module.

Posted on Apr 23, 2014

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Posted on Jan 02, 2017

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SOURCE: 4WD shift problems

Some one told me to unhook the batery for half an hour then hook it back up and try it. Well it worked,no more shif problems.

Posted on Nov 29, 2008

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SOURCE: 4wd high 4wd low lights flashing

When the 4WD lights flash on and off, this indicates that there are 4WD-related trouble codes in the 4WD control module. Sometimes 4WD lights never illuminate.
The first step in diagnosing the system is to establish communication and retrieve trouble codes from the control module. After retrieving the codes, write them down, clear the codes and retest to see which codes are regenerated. False codes can be set if a component is disconnected when the key is turned on.
If the 4WD lights flash on and off, and no codes are found in the 4WD control module, try clearing the codes anyway. After a certain amount of key cycles, the codes will normally clear from the 4WD control module, but the module will not respond to commands until it is re-initialized by clearing the codes or disconnecting the battery to erase its memory.
If your scan tool will not communicate with the 4WD module, first verify that the scan tool has the proper software and the latest updates. If it does, then try another scan tool. If it still has no communication, the power and grounds that are supplied to the module will need to be tested. See if the scan tool will communicate with the other modules on the shared communication network. If they're OK, check the harness from the data link connector (DLC) for an open circuit to the 4WD module.

Posted on Jun 05, 2009

emissionwiz
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SOURCE: 98 explorer - 4wd and 4wd low light both blink 5-6

the transfer case motor is defective.

Posted on Jul 08, 2009

abdoush
  • 12 Answers

SOURCE: 4WD switch not working on a Hummer H2

Same thing happened with my H2 2003 model, no lights above the 4wd buttons and i can't switch between high and low 4wd.
did u know what is the problem ?

Posted on Sep 08, 2009

abdoush
  • 12 Answers

SOURCE: change light on 2006 hummer h2

it can be easily changed by removing the plastic cover then u will see the light bulb, don't try to change it from the back, it wont open :)

Posted on Sep 08, 2009

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2 Answers

Why is the service 4WD message on all the time and diff lock light flashes and dos not lock?


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?

Sep 22, 2015 | 2006 Hummer H2

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2003 h2 hummer is having shifting problems with transfercase. and the shifter moves freely even if the truck is off with out using break pedal


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.

Mar 27, 2013 | 2003 Hummer H2

1 Answer

Do you drive.in two wheel or four wheel drive, how do you change.to two wheel drive?


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.

Jun 23, 2011 | 2005 Hummer H2

2 Answers

My 2006 Hummer H3 is having the same issue with the Four-wheel drive button. Do you put the vehicle in park then neutral and then select 4Up? I was told to drive it backwards to unlock it if it doesn't...


It doesn't take long to learn when and how to use your truck's 4WD system. Follow these steps and you'll feel confident about engaging the system the next time you need to get out of a slippery situation.

For a conventional system, where you can select 2WD or 4WD, the instructions refer to engaging 4WD. For trucks with permanent 4WD, they refer to locking the center differential.

Time Required:
varies
Here's How:
  1. Refer to your owner's manual to find out how to engage your truck's 4WD mechanism.
  2. When driving in snow, mud, or just going off road, shift into 4WD when you get ready to leave solid ground. If you have lockable front hubs, lock them for those operations.
  3. For severe conditions, use low range if available. Before shifting into low range you must either stop or slow down to at least 3 mph to prevent grinding gears.
  4. When you return to normal conditions, shift out of 4WD or unlock the center differential. If the shifter doesn't want to move from 4WD or the differential lock stays engaged, don't panic, becaue the problem is normal and is caused by pressure on the gears.
    • Try backing in a straight line about 10 feet and try to move the shifter again.
    • If the shifter still won't move, try backing in an "S" pattern while trying to move the shifter.
  5. If you have lockable hubs, don't forget to unlock them when you return to dry pavement.
Tips:
  1. Vehicles with permanent 4WD are set up for everyday driving, but not necessarily for maximum traction on slick surfaces. Engaging the differential lock increases the vehicle's traction capabilities.
  2. Do not operate a locked 4WD on dry, hard surfaces. Doing that could cause damage to the driveshafts, differentials or transfer case.
What You Need:
Owner's Manual

Good luck and remember to rate this solution.

Thanks for using Fixya.

Mar 07, 2010 | 2009 Hummer H3

2 Answers

My 2006 H3 will not come out of 4 wheel drive?


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?

Feb 13, 2010 | 2009 Hummer H3

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Just got H 2 2005 4 buttons 4 the 4 wheel drive


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.

Jan 12, 2010 | 2005 Hummer H2

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My H2 2003 hard or take time to shift when running to 35+ MPH


check your tranny fluid and filter. you may have a clog some where or could be low on tranny fluid.

Jul 25, 2009 | Hummer H2 Cars & Trucks

2 Answers

4WD switch not working on a Hummer H2


Same thing happened with my H2 2003 model, no lights above the 4wd buttons and i can't switch between high and low 4wd.
did u know what is the problem ?

Mar 25, 2009 | 2005 Hummer H2

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