When I am traveling and reach an elevation of 5000 ft and above my check engine light comes on. when I get back below the 5000 ft level and turn the truck of for about 30 min to an hour the light goes out.I took it to the dealer and they were unable to get the code becuse they said when the light goes out the code is ereased. So I do not know how I am going to be able to get my truck to the dealer while the check engine light is on. Does anyone know what could be causeing this and what I can replace myself that might fix this?

 

When you travel up or down elevation, your map sensor sees greatly different barometric pressures.

When you first start your truck, your pcm looks at the baro pressure before it starts and sets its parameters accordingly. When you went up 5000ft, the pressure was way different. If you would have shut off the truck and restarted, the pcm would have figured it out and ran ok.

Welcome to the **** dodge pcm.