P0300 DTC : Bonneville GXP/Northstar Powered Cars

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P0300 DTC

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sethjamesrimrodt

Post subject: P0300 DTC

Posted: Mon Nov 05, 2012 8:32 pm

Posts like an L36

Joined: Mon Mar 28, 2011 10:09 am
Posts: 880
Location: Mason City, Ia
Year and Trim: 2004 GXP

Well my car started randomly missing really bad yesterday when the car was cold. It came out of it after I turned it off then back on. I didn't think much of it until today when I was going to leave home for school and it was missing so bad it wouldn't stay running. The service engine soon light was blinking during this.

I'm driving 75 miles home tomorrow after school to take a look at it. I suspect it's a wire going to the coils since I was working in that general location earlier in the week. I also ordered a new set of coils just in case.

I guess my question is, the code P0300 can only come from bad coils? Or could it be fuel related? And is there any way to check the coils with a digital multi meter to see if they are bad?

Thanks everyone,

_________________
Seth

Bonita 78,000 miles traded on a CTS4

RogueSSEi wrote:

Bet she'll stop on a dime and give you 3 pennies back!

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dpnewfie

Post subject: Re: P0300 DTC

Posted: Mon Nov 05, 2012 10:38 pm

Posts like an LN3

Joined: Thu May 22, 2008 8:01 am
Posts: 598
Location: Conroe, Texas
Year and Trim: 2005 GXP

You probably have a bad coil, Seth. I had the same issue very early on in my cars life and IIRC there were other members on here that experienced the same problems. My issue surfaced when the engine was under load and not yet up to temp.

I'm sure there is a way to check them I just can't say for sure.

Good luck!

Norm

_________________
2012 CTS-V Coupe, 4k miles and counting.

J Wikoff wrote:

It has been an honor and privilage to have been serviced by you.

2005 Bonneville GXP, 200k and SOLD!

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sethjamesrimrodt

Post subject: Re: P0300 DTC

Posted: Tue Nov 06, 2012 8:47 am

Posts like an L36

Joined: Mon Mar 28, 2011 10:09 am
Posts: 880
Location: Mason City, Ia
Year and Trim: 2004 GXP

Thanks Norm! Wish me luck

_________________
Seth

Bonita 78,000 miles traded on a CTS4

RogueSSEi wrote:

Bet she'll stop on a dime and give you 3 pennies back!

Top

nos4blood70

Post subject: Re: P0300 DTC

Posted: Tue Nov 06, 2012 10:51 am

Certified Bonneville Nut

Joined: Mon May 10, 2010 6:11 pm
Posts: 9496
Location: Chicago, IL
Year and Trim: 2003 SLE

Good luck!

_________________
-Car Guy Carl
"Penelope" - 2003 SLE - 247k Miles
"Sydney" - 2000 Honda S2000 - 98k miles

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sethjamesrimrodt

Post subject: Re: P0300 DTC

Posted: Tue Nov 06, 2012 3:33 pm

Posts like an L36

Joined: Mon Mar 28, 2011 10:09 am
Posts: 880
Location: Mason City, Ia
Year and Trim: 2004 GXP

Thanks Carl,
I pulled another code P1106, I think this one is caused by the massive vacuum leak I found.

When I went to start it Monday it backfired and I think that's what blew apart the rubber elbow on the passenger side of the intake manifold causing my vacuum leak.

This looks like it will be fun to replace and find a new elbow, the power steering pump is in my way.

I am going to go get my dads scanner and see if I can pin point the misfiring cylinder(s) I am still getting the P0300 with no corresponding P030X code and my SES light is still flashing.

_________________
Seth

Bonita 78,000 miles traded on a CTS4

RogueSSEi wrote:

Bet she'll stop on a dime and give you 3 pennies back!

Top

sethjamesrimrodt

Post subject: Re: P0300 DTC

Posted: Tue Nov 06, 2012 9:18 pm

Posts like an L36

Joined: Mon Mar 28, 2011 10:09 am
Posts: 880
Location: Mason City, Ia
Year and Trim: 2004 GXP

Fixed! Used an AC Delco coil pack and a vacuum elbow for a Chrysler 3.8 PCV valve. Runs great thanks!

_________________
Seth

Bonita 78,000 miles traded on a CTS4

RogueSSEi wrote:

Bet she'll stop on a dime and give you 3 pennies back!

Top

dpnewfie

Post subject: Re: P0300 DTC

Posted: Tue Nov 06, 2012 10:58 pm

Posts like an LN3

Joined: Thu May 22, 2008 8:01 am
Posts: 598
Location: Conroe, Texas
Year and Trim: 2005 GXP

_________________
2012 CTS-V Coupe, 4k miles and counting.

J Wikoff wrote:

It has been an honor and privilage to have been serviced by you.

2005 Bonneville GXP, 200k and SOLD!

Top

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[ 7 posts ]

Portal » Board index » Mechanical and Maintenance (no chat or performance) » Bonneville GXP/Northstar Powered Cars

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