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2007 Pontiac gp 3.8 check engine lite comes on ,says loose…

Customer Question
2007 Pontiac gp 3.8...

2007 Pontiac gp 3.8 check engine lite comes on ,says loose gas cap. replaced cap with new one same problem. 150,000 miles

Mechanic's Assistant: Does the light stay on, or does it blink?

Stayes on

Mechanic's Assistant: What is the model of your '07 Pontiac?

Grand prix st 3.8 v6 turbo

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

Yes I am ,retired mechanic changed gas cap and has been smoke checked

Submitted: 4 months ago.Category: Pontiac
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Answered in 7 minutes by:
3/17/2018
Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago
Chris
Chris, Auto Service Technician
Category: Pontiac
Satisfied Customers: 14,875
Experience: 43 years of automotive repair, Smog license
Verified

Hello, my name is ***** ***** I will assist you today. The gas cap message will stay on for a while until the PCM (engine computer) can run a few leak tests on the evaporative emission system. Once the test passes 3 times, then the message will go away. However if you disconnect the negative battery cable for 2 minutes and then reconnect it, the message should go away. So do that if you want the message to go away now.

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Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago

I hope this information/answer is helpful, and if so would you please help me and rate my service using the stars at the top of the page or 'accept' my answer.
Rating or accepting my answer does not cost you extra. It allows me to be credited for this Q&A.
If you cannot rate or do not see where to rate, please let me know!
You can ask follow-up questions after you rate or accept. Thank-you!

Chris

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Customer reply replied 4 months ago
i have cleared codes three times ! but drive it and will come back on after two or three short trips!
Customer reply replied 4 months ago
no thanks new better than try this!
Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago

Okay, then you have an actual evaporative emission system leak in the tank, hose, purge valve, or leak detector assembly. You will need to have a shop connect their leak tester and locate/repair the leak. Then you should be good.

Chris

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Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago

Hello, were you able to see my last reply?

Chris

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Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago

Hello, just checking back to see if you received my replies from yesterday. Please let me know if you did, or if you still need more help.

Chris

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Customer reply replied 4 months ago
was smoke ck at Pontiac dealer no leak
Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago

Then if the technician is sure that there is no leak at all in the system, then the leak detector assembly is faulty and reporting a false leak to the PCM. I do see that from time to time and in cases like that I end up replacing the leak detector. That should then take care of it.

Chris

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Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago

I hope this information/answer is helpful, and if so would you please help me and rate my service using the stars at the top of the page or 'accept' my answer.
Rating or accepting my answer does not cost you extra, and does not close this session. It allows me to be credited for this Q&A.
If you cannot rate or do not see where to rate, please let me know!
You can ask follow-up questions after you rate or accept. Thank-you!

Chris

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Pontiac Mechanic: Chris, Auto Service Technician replied 4 months ago
Good morning! Just checking back to see if you still need help with your Pontiac. If so please let me know. If not, thenwould you please help me and rate my service using the stars at the top of the page or 'accept' my answer.Rating or accepting my answer does not cost you extra, and does not close this session. It allows me to be credited for this Q&A. If you cannot rate or do not see where to rate, please let me know! You can ask follow-up questions after you rate or accept. Thank-you!Chris
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Experience: 43 years of automotive repair, Smog license

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