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Cat Man
Cat Man, Cat Engine Expert
Category: Medium and Heavy Trucks
Satisfied Customers: 8910
Experience:  I am ASE Master Truck Certified.
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I have a message on my ecm on a cat c 15, message says

Customer Question

I have a message on my ecm on a cat c 15, message says altitude adj active. What does this meen?
JA: What's the make/model/year of your truck? Engine type?
Customer: 2007 Kw T800 Cat C-15 475 hp twin turbo
JA: Are you fixing your truck yourself? What have you tried so far?
Customer: we hooked the computer up and did an injector cut out, the mechanic says he has never seen this message before
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: engines starts rough, and doesn't idle just right
Submitted: 10 months ago.
Category: Medium and Heavy Trucks
Expert:  Cat Man replied 10 months ago.
Thanks for asking your question. I will try and help you out.
I have seen this many times.
This is just a message the ecm broadcast at low loads and while performing certain test. It does not hurt anything nor is there anything wrong.
This message is an emission message actually.
Altitude adjust can also go active on the screen at high altitudes like out west.Please reply back if you need more help or have more questions. I am happy to assist.