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ChevyTech · 10-14-2007, 08:53 PM

A bad ECM would cause the code 55 and that should be repaired before working on any other code.

What are you working on?
What year?
What vehicle?
What fuel system?
Is it stock?

10-14-2007, 08:53 PM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: Code #41 and #55 A bad ECM would cause the code 55 and that should be repaired before working on any other code. What are you working on? What year? What vehicle? What fuel system? Is it stock?