Service engine soon light flashing - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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Old 09-10-2019, 02:24 AM
Jreyes Jreyes is offline
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Join Date: Sep 2019
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Service engine soon light flashing

Just today my reliable 2003 tb service engine soon light was flashing and started to misfire and my cruise control stopped working also. I’m assuming that it’s the spark plugs or maybe a ignition coil. Has anyone had these issues and how did you solve them ?
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Old 09-10-2019, 08:29 AM
Ponvoy Ponvoy is offline
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2004 GMC Envoy SLT XUV
Carbon Metallic 4.2L I6 2WD
Join Date: Sep 2018
Location: Houma, LA
Posts: 27
Just recently went through this very issue. First off you'll need to have the code read. That will point you which cylinder(s) is causing the misfire. From there you can take the easy path and throw a coil and spark plug at that cylinder, or you can diagnosis it by moving the coil to another cylinder and seeing is the misfire jumps to the cylinder that you moved it to, if so its a bad coil. Also, be sure to check the harness that going to the coil. They have been known to go bad, aswell.
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