06 gmc check engine light on - Engine ODB2 Fault Codes


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Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes

gfay
Novice

Jun 21, 2011, 2:22 PM

Post #1 of 4 (3253 views)

06 gmc check engine light on	Sign In

I have a 2006 GMC 2500HD 6.0 engine. I am getting a 300 code, I know it is a multiple misfire and i get a 455 code emission leak.I have replaced the plugs and wires so far. I erase the code but within 3 miles the light comes on and at 50 mph will start blinking, when I slow down the light will just stay on. I have done nothing about the 455 code I am not sure what to do.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 21, 2011, 2:52 PM

Post #2 of 4 (3248 views)

Re: 06 gmc check engine light on	Sign In

What led up to this PO300 code? Was something repaired recently in the engine?

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

gfay
Novice

Jun 22, 2011, 8:22 AM

Post #3 of 4 (3230 views)

Re: 06 gmc check engine light on	Sign In

I bought the truck with 226000 miles. It wasn't long after the light came on. I erase the code and approx. 4 miles it takes to come back on.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 22, 2011, 9:20 AM

Post #4 of 4 (3227 views)

Re: 06 gmc check engine light on	Sign In

With that many miles, anything is possible. Start out with a complete compression test so you don't throw good money after bad.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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