Can altitude cause check engine light to come on?

[radin2son]

In the western states it is not uncommon to drive and fill up the gas tank at 6,000 to 7,000'. On occasion mountain passes are over 10,000' and many campgrounds are at this elevation.

 

Almost, if not all, trips we have taken, the check engine light and loose gas cap warning has come on. On our most recent trip, the loose gas cap (replaced under warranty at last service) warning came on. It was not loose and I hit reset; it did not come on again. Later in the trip, we refueled at 6500'. After a 1/4 tank was used, we drove up to almost 11,000' and then camped at 7300'. The check engine light came on.

 

I know this is a closed system, but look what happens to an empty water bottle. A full bottle does the same but is less noticeable.

 

Any thoughts, scientific or otherwise? I have asked the service manager to look into this.

 

Another annoying dash glitch has been the deletion of trip "A" and "B" info at around 3,000 miles. Can it not count any higher? I have no intention of trying to get this looked at.

[axulsuv]

The tank pressure sensor may be the culprit , Between elevation changes and under vehicle latent heat , it may be seeing changes the ecu thinks are too big a change , although the system will still pass it's self tests ...

 Just a shot in the dark ....

Glenn