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4-5 code on start

Bill Boyce76
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Bill Boyce76 Apprentice

Bill Boyce76

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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.

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