Check engine soon light

FIREFLY99

MEMBER
2005 ALL OTHER MAKES ALL OTHER MODELS
V6
AUTOMATIC
179,000 MILES

My check engine soon light has been staying on for a while now in my 2005 Pontiac Bonneville SE. When I was driving it earlier today the check engine light started flashing off and on, and the car started slowing down, and started vibrating and shaking really hard, and it would not go over fifty mph, and it started giving off a strong rotten egg smell. Can you please tell me what is going on with my car? Is it my transmission?

2 Replies

HARRY P

MECHANIC
2,293 POSTS

When the check engine light comes on, it is because the computer has identified some issue and has stored a trouble code. You need someone with a scanner to plug in and retrieve the code(s) from the system. This can be done for free at the local AutoZone, Advance Auto, or O'Reilly Auto Parts. The good news is that I doubt that it is your transmission.

Get it scanned and let us know what it says. We will go from there.

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Saturday, August 5th, 2017 AT 3:41 AM

RENEE L

ADMIN
1,257 POSTS

Hi FIREFLY99,

If you decide you would like to conduct the scan yourself here is a link to an article that features written step by step instructions and pictures explaining how to do the scan yourself. Also, I have included a link to our YouTube channel with a how to video on code scanning.

This is applicable even if your check engine light is not on.

Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k

Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin

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Saturday, August 5th, 2017 AT 4:52 PM