Service Engine Soon Light

155,000 MILES • V8 • 4WD • AUTOMATIC
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JSWANSON44
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  • 3 POSTS
The service engine soon light came on a while back and today we went to get inspected it did not pass.
Mar 16, 2010 at 5:47 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Hi jswanson44, Welcome to 2carpros and TY for the donation

What you need to do here is have the computer scanned for code/s this is your starting point of diagnosis and get back with the code/s we start here

Or you can do it by jumping B to A on the diagnostic link connector and read of the flashes-example DTC 12 will Flash pause Flash Flash
Mar 16, 2010 at 6:00 AM
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JSWANSON44
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  • 3 POSTS
I thought 95 and up have a scan system, how do i have this scanned or how do they hook up to my truck, can i go to like auto zone and use one of theirs?
Mar 16, 2010 at 6:06 AM
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RASMATAZ
  • ✓Experienced Mechanic
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You can do it yourself jumper B to A see below


https://images.2carpros.com/forum/automotive_pictures/12900_GM_ALCL_46.jpg

Mar 16, 2010 at 6:33 AM
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JSWANSON44
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  • 3 POSTS
Ok, you said that in your first response. this helped, found out the coolant sensor was bad, all fixed now.
Mar 16, 2010 at 7:25 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Just trying to help you here in the event it happens again-you can do it without autozone's help. Of course they can pull the code/s for you.

Mar 16, 2010 at 7:38 AM
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THIS IS MIKE
  • ✓Experienced Mechanic
  • 686 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
Mar 16, 2010 at 7:44 AM
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