I have a new vm9424 that was put into a 2005 h2. Main problem is i can reset the time, but once i drive it for more tha a mile the clock keeps resetting its slef to a /12 hour later than it is.. nor a big problem, but one tht id just enough to really **** you off

Shift cable broke. Or a related part.

You need to do what is referred to as a drive cycle . A specific way of driving the vehicle .From a cold start till warm up , at different speeds and different conditions. Hope this helps !http://www.obd2.com/support/reprog/downloads/chrysler/chry-imset_procedure.pdf

Make sure the fan opening at the rear of the unit is not obstructed. It cannot cool itself is this opening id blocked.

It looks like the clock is on its way out. I would try two things. First, turn the power off at the main switch, leave it off for a few mins and then turn it back on and see if it makes a difference. You may need to do this a couple of times. Secondly, with the power switched off, repeatedly press all the clock buttons one at a time a number of times - there may be a contact that needs cleaning by operation and then see what happens. if you do need a new clock/timer then ask espares for a quote.

The clue is that you have to reset the clock. You are losing power somehow. the Main Board thinks it is being unplugged and it resets the clock and you have to start all over. The fact that after so many times it will finally work tells me that whatever bad connection you have is finally getting hot enough to expand and make a good enough connection to keep working. Intermittant connections are the worse to find. A lot of trial and error to find the problem. can be bad fuse and fuse holder ( in the unit), bad outlet, loose wire at circuit breaker, loose wire at outlet. Even a loose breaker where it snaps onto the buss bar in the Breaker Box. Etc, it an really drive you nuts trying to find it. Try the unit in a totally different area making sure it is on a compleately different circuit breaker and see what it does, if the problem follows the unit, the problems is in the unit. If not, electrical problems, outlet, breaker, panel,

I would suggest checking your wiring (core wire on the distributor, plug wires and the negative battery ground) I would imagine that the forward motion of the vehicle is possibly making your wires lose connectivity and making the car stall. Just a thought though.

Carl

I'm sure anyone with an OBD reader can reset the warning for you you. Also you could search the Hummer forums to see if anyone has fix for this.