LS4 Performance - Bad head gasket??

I was driving my fiances cousin home from visiting family. It was a four hour trip each way so my 07 gp gxp was running for about 8 hours straight with a 30 min break when we stopped for food.

About 3/4 way home I had a change oil soon light come up followed by a cel (which ill scan tomorow morning with my tuner. Then white smoke started coming out of my exhaust.

I pulled over immediatly and checked the oil which was full and not milky.

Is this usually the sign I have a bad headgasket?

Are you losing coolant ? Did your exhaust change color at all ?

What does it smell like?

What does it smell like?

x2

If you're leaking coolant internally, the exhaust would have a "sweet" smell to it. White smoke from the exhaust usually means a coolant leak.

I scanned the code and actually it was a bunch actually p0171,p0300,p0455,p0645. talked to my local mechanic who does all my mods and mantenance and he said trade it quickly lol. so looks like im trading it in.....

u1040 aswell lol

I had a bad head gasket too but my engine light had came on after I had my tranny fixed. I did see the white smoke on more than one occasion. I had it checked and the mechanic told me that the car threw me a bunch of codes

I think your computer is on the fritz.... Way too random of codes to all happen at once...you have an evap leak code, random miss fire, ac clutch code, abs failure to read.... Check your grounds and also try disconnecting the battery for some time to reset things.

So did you actually troubleshoot this or have a professional tell you that the head gasket it blown....