I just bought a 2006 gx that has been lifted about 3" with old man emo springs. The ride height adjustment was removed and the adjustable shocks replaced with a larger non adjustable model.
The rims and tires were also replaced. I think the rims are 21" and the tires 33". The running boards were also removed and the wheel wells opened up a little.

The tire pressure indicator light is on all the time as the new rims and rubber don't link up to the sensor. This I can live with.

I tried it out today on a dirt road (Ophir Pass, Colorado) It worked great but about 200 yards in the check engine, and all three ride/safety system warning lights came on. (stability and slip sensors).

The car performed flawlessly, but the lights remained on even after I got to pavement. I did stop and check, oil, temp, coolant, etc when they came on and all seem to be fine.

I suspect it has something to do with either the oversized tires or the disconnected shock and height systems. Any thoughts on how to get the lights to turn off would be greatly appreciated?

 

I just went back over all the "how-tos" for the GX and found out that all the lights may have come on because of a bad or improperly sealed gas cap. I will try that fix first.

 

Yeah, had that happen to me a couple months back, read the codes, and I think it was small leak in evaporative system, so i replaced the gas cap with a brand new one, and everything's back to normal. CEL haven't come back in a month.

 

Without scanning the codes, your guess is as good as ours.

 

it could be a wheel speed sensor cable, it goes down the spindle to the brakes, and maybe a rock took it out? this will cause those same lights to pop up

 

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This is something I noticed when I performed my lift. I noticed the way the wire was extremely tight in certain spots and I was afraid that in off-road conditions it might stretch or break the wire. So I re routed it slightly to give it plenty of room to where it wouldnt bind or get stretched or break.