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Had it diagnostic check by OnStar and told me this two codes…

Customer Question
Had it diagnostic check...

Had it diagnostic check by OnStar and told me this two codes came up C0561 and P0300 just wondering if I can get some help on this thanks

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

Have not

Mechanic's Assistant: What is the model/year of your Chevy?

2007 Silverado 1500 LTZ

Mechanic's Assistant: Are you fixing your Silverado 1500 yourself? What have you tried so far?

Have not I was just trying to find out what those codes were

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

No thank you

Submitted: 11 months ago.Category: Chevy
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Answered in 1 minute by:
8/6/2017
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 11 months ago
kalamykid
kalamykid, Shop Owner/ Tech
Category: Chevy
Satisfied Customers: 5,523
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
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What size engine does your truck have in it?

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 11 months ago

The p0300 code is for a random miss fire. Code c0561 is for the anti lock brake/ traction control. You can ignore the c0561 code for now as this code will set any time the engine has a problem. The miss fire code is the one to worry about. Now here is the hard part, what cylinder is having a problem? To find out for sure, the best thing to do is drive the truck so the computer can determine what cylinder is missing. The best way to get the computer to see what cylinder is missing will be to drive up a large upgrade top put a load on the engine. When the engine starts to miss the computer will set the p0300 code first to let you know there may be a problem. When the check engine light starts flashing, the computer has been able to determine what cylinder is missing and will throw another code such as a "p0304". The next code will tell you what cylinder is miss firing. The p0304 code is for cylinder 4.

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