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Discussion Starter · #1 · (Edited)
Looking for mechanically inclined folks who know this machine better than I.
‘06 Hemi started overheating last week, luckily noticed it right away and coasted in to the oil change shop I was just at the week prior. They were able to pop in a new thermostat quickly and keep me going. The next day I am throwing two codes with no symptoms that I can tell yet, p1521 and p0174.

First thought was something not plugged back in correctly or connector broke, but can’t see anything.

Any thoughts?
 

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2006 Commander Limited, 5.7 Hemi QD2
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Discussion Starter · #3 ·
Thanks for the reply.

I believe I have figured it out and will follow up with our suspicion tomorrow once I can pull it into my friends garage.

air box was left unclamp after the thermostat change which was letting the unmetered air get through throwing that code.

I believe the viscosity code was leftover from overheating causing the oil to be too thin as I’ve cleared them and all appears to be well.
I’ll be sure to go introduce myself and follow up with our lift install tomorrow.

thanks again!
 

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Discussion Starter · #4 ·
Side note... did anyone else know that Kenwood head units display codes and give you the ability to clear them? I had no idea.

42515
 

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2006 Commander Limited, 5.7 Hemi QD2
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WoW that's a new one, thanks
 
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