ALTITUDE PRESSURE SENSOR
Hello: I have an 07 Chevy Duramax/Allison 2500hd. Last year while heading up to the High Sierras and pulling my 30ft 5er, the engine light came on. After calling On star it was determined that it was...
Forum Discussion
This is probably not your problem but on my old 96 gas ram truck If I went over 12k in elevation the check engine light would come on (i know very few roads get that high but I found a few of them here). So I take it in they do this that and the other. Every time I went on 2 specific roads the light would come on. Finally one of the techs got to the bottom of it. The ecm was not calibrated/mapped to run that high of elevation. Probably more specifically that low amount of air/02 So when the truck sensors sensed the lack of air it no longer had a fueling map to go from the truck still ran ok just the check engine light would come on.
