Bill Boyce76 Posted May 30, 2018 Share Posted May 30, 2018 My 04 CX612 with a mack 350 gets a 4-5 code and no boost on start up. If I let it idle for a few minutes at startup, the vgt actuator seems to hunt, then actuate, and the system then works fine without a fault code. can someone tell me if that is normal? I don’t see a note in the owners manual. I’m a little bit new to the more modern Mack’s. Quote Link to comment https://www.bigmacktrucks.com/topic/53447-4-5-code-on-start/ Share on other sites More sharing options...
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