i have a 2006 hummer h3 and i am having a problem where whenever i start up the engine, it is atomatically engaged into 4 high lock. i have to go back and disengage it back to just 4 high. the other day it also said service 4wd. any help or ideas on what the issue is would be greatly appreciated!!!
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4x4 issues
- Thread starter nighthawk
- Start date
![IMG_5401[1].jpg](/forum/data/attachments/10/10384-25507ca7a92386c15b9f91d2d0624a2d.jpg)
derian06
Red Rockett
- Messages
- 1,866
- Location
- Madison, AL
i have a 2006 hummer h3 and i am having a problem where whenever i start up the engine, it is atomatically engaged into 4 high lock. i have to go back and disengage it back to just 4 high. the other day it also said service 4wd. any help or ideas on what the issue is would be greatly appreciated!!!
May be a simple thing to check, but have you pulled your dash and pulled the 4wd plug out and pluged it back in? Have you disconnected the battery overnight? Try these then get back to us
I actually did both of those in one day... is that a bad thing ? i got a new battery that i put in and i was fixing some wires on my radio and my 4wd plug came out so i pluged it back in.
derian06
Red Rockett
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- 1,866
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- Madison, AL
Did the problem start as soon as that happened? It's probably a good thing if that is the case.
yeah i noticed it the day after i did that. its probably nothing hopefully
derian06
Red Rockett
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- 1,866
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- Madison, AL
Someone with a little more experience will probably chime in, but i'd say thats a really good sign. Sounds like you may have just tugged on a wire too hard.
4speedfunk
Well-Known Member
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- 4,250
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- Tardville
Also check the dash buttons...they are know to stick, causing all sorts of issues.
well it didnt do it this morning so hopefully its fixed :thumbs:
digglesworth
Well-Known Member
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- 1,789
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- illinois
I had this issue after driving around with my dash pulled out to get out to a wide open area to tune my cb antenna with an swr meter. Did this on and off for a few days. I had a few more error messages though than just the serv4wd... Found a guy in my local 4wd club that had a snap-on code reader. Not just engine codes, ALL codes. I had a bunch of transfer case and transmission codes that were all linked to no communication between the trans and t-case and all that nonsense. He cleared all the codes and everything's been fine ever since. We attributed it to having everything unplugged and driving it around like that.
Yeah mine hasn't done it at all today so I'm thinking it was just something to do with just unplugging the 4wd buttons. It's fine now
Humvdood
Well-Known Member
- Messages
- 81
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- Fort Worth
I've installed about a dozen H3 stereos - maybe 4 of them have come back to me with this issue.
If you unplug the 4wd buttons with the negative battery terminal still connected it'll freak out the 4wd and the stability control.
Always disconnect the negative battery terminal when doing any type of electrical work on your car and put everything back together before reconnect it.
If you unplug the 4wd buttons with the negative battery terminal still connected it'll freak out the 4wd and the stability control.
Always disconnect the negative battery terminal when doing any type of electrical work on your car and put everything back together before reconnect it.