Alright you guys have helped in the past so I'm hoping someone can throw me a bone on this one too. First off I filled up with gas yesterday, then about 45 minutes later I noticed my gas guage falling slowly but steadily, I was at a stop when I noticed this. I got home, knowing I had plenty of gas, and did the little diagnostic test (on, off, on, off, on) no codes showed up. I did the actuator test and got C - Code 23. I looked that up and it says it is the "Headlamp Switch Input Circuit Open" and also Code AA which says "PCM Messages Not Received". I figure the latter is from me reseting the PCM via pulling the fuse and doing the reset as mentioned in some other posts on here. And then after it gave me that AA code, along with the 23 code that I already had. Any ideas on how to fix this? Or is this even something I can fix? The gas gauge seems to be working fine and given what codes were spit out I'm guessing the whole gas thing was just some freak occurence and not to be worried about it. I hope.

Oh yeah I have an 02' QC 2WD 4.7L Auto....short bed, no mods. Just had the oil changed almost 1K miles ago in case that has anything to do with it. You never know with all the weird sensors.

thanks guys.

 

You may have already fixed it. Sometimes it's like re-booting your computer.

 

Nope not fixed yet. I tried the actuator test again this morning. Both codes are still there. I tried clearing the codes, via disconecting the negative battery cable for a little while, but the code showed up again still.

 

still no one with any clues on how to fix these codes?