2004 Pontiac Grand Prix GTP with Monsoon
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Hokay so,

I bought an Aeroforce in like march of 2012, I had a Kenwood Mp342u head unit connected with a gmos-01 harness, worked beautifully for like 5 months, not a single issue with the gauge or the head unit.

Got a new head unit, Kenwood 452U, got a gmos-04 harness with it, also an aftermarket satellite receiver so I could get my XM back, hooked it all up, works good for like 2.5 months, smooth sailing through calm seas, happy times.

Weather starts to get cold, battery kicks the bucket, replaced.

2 days later Im driving home at night and my gauge shuts off like I shut off the car and opened the door, face goes dark and the 2 little LED'* blink. (This is what happens when you shut the car off and open the door) Gauge resets, starts up again... shuts off again

EVER since that night, my gauge has done this non-stop, just shutting off, reseting, and shutting off again. It seems for the most part like it runs solid until the car gets up to temp, then it starts it'* never ending reset cycle. Sometimes it stays on a few seconds longer, sometimes it resets instantly once the data comes up. Im only running Coolant temp and IAT at the moment.

It keeps running solid if I take it off scan mode and put it into set up mode.

Gauge manufacturer says the following:
"What is happening is that the gauge is running, then for whatever reason it stops seeing data traffic on the car'* bus system so it thinks the car is off and turns off. Then once it turns off, it sees bus traffic in the system and starts up again, thinking the car is running again.. Then it stops seeing traffic again and etc. You know it'* not a power issue because it doesnt shut off when you have it in set up mode, but only in scan mode, so it'* an issue with the data it'* seeing or not seeing."

But he has no explanations on what might cause it beyond add on electronics.... I disconnected the aftermarket satellite tuner, no change. I read that having the factory xm tuner connected at the same time as an aftermarket one can cause a bus conflict. I removed the factory tuner, no change. I removed the aftermarket tuner again and just left the factory one in... nothing. I put it back to the set up I had when it worked perfectly for 6 months, no change. I put it back to COMPLETE STOCK, factory head unit with no extras, no change. It'* still doing this with the stock radio and no harnesses, it'* still doing it with the identical set up that had it working perfectly for half a year too.

I havnt heard back from him yet on the fact that it still does it with the factory HU back in, because that was his most recent suggestion.

What the effing hell? Does anyone have suggestions or ideas? Im getting desperate and Im thinking about asking him to take it back and look at it, and hopefully replace it. He says he really seriously doubts it'* an issue with the gauge though.. And I dont have another GM car that uses the PT gauge to test it on.

Here'* the thread in which I've been discussing the issue with the manufacturer.
Aeroforce Technology Inc Technical Forums › View topic - Gauge is resetting constantly.

Please haaaaalp.

I'm not familiar with those scanners, but from the sounds of it, you attempted to eliminate all possible outside interferences.

I know you don't have another GM car, but I think it would seriously help your plea to be able to test it on another platform. Especially if you have nothing else on your car connected to the same data bus.

i agree, the next step is trying it on another car. should be any obd2 vehicle that shouldnt be hard.

Did you do the installation? Check all the wire connections in case you knocked something loose and it is making occasional contact.