For the second time I noticed a service 4 wheel drive light where my mpg,miles,etc light up...I have a 06 H2...anyone else ever have this issue? Techs I work with said it's either the 4x4buttons or a module in my transfer case...gotta scan it tomorrow. anyone else ever see this message?

 

I've only seen that particular warning on my H3---turns out I was driving all over the Las Vegas freeways with no brakelites!!
I took it in to the dealer to have it looked at and they jumped on it quick, apparently that was a known issue on that 06. Scared the hell outta me--man that could have ended bad.
Hope it's not a module or something else expensive sounding!

 

I'm gonna check my break lights in the am 4 sure... I'm hoping it's just the switch...whatever it is I'll get it fixed wholesale since I work at a dealership...Still sucks!

 

My H2 has done it a few times. It came on maybe 4 or 5 times in a week. I did some research and found that some have this problem after driving through a car wash. I dont know if it from water getting sprayed on something. But it has never came back on since so I didn't worry to much since everything still works just fine.
It's risky to drive around if something really is broke but I haave heard of sensors being stubborn quite often.

 

you should have it scanned. a shop can scan the transmission and the transfer there should be a code to help you point the problem out. i dont think an OBD2 can read these codes. the last one that came in the shop it was just the switch . but just have it scanned before you start putting parts on .

 

I am having similar intermittent problem, all lights come on on dash , sometimes says service 4 wheel drive, sometimes not, sometimes speedo not work either , usually all other gauges not work , also windows will not go up or down, someone mentioned possible ground problem???? or maybe security system problem,or short, one time would not start , no headlights, then waited hear like clicking noise then turned right over,(not stater clicking) recently scanned during episode..would not read, also ac not work during episodes, enough diagnostic info here? any help appreciated,ideas?

 

cycle through your 4x4 options. Go from 4 high to 4 low lock and make them work. It's a known issue. If you don't cycle them it will throw the message. Mine came on before and I just cycled everything and it was fine.

 

dont know if last reply was directed towards me, I thought more electrical problem, but cycled through 4x4 modes now stuck in low,

 

Jeff, sounds like a pretty complex problem. Your BCM would have a lot to do with every symptom your having though. You need to take it in to a trained tech and have it diagnosed.