Question about 2003 Chevrolet TrailBlazer

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My wifes 2003 trailblazer is running badly i had

My wifes 2003 trailblazer is running badly i had my father in law hook up a scanner and got these codes P0172 P0306 PO340 im fairly mechanical have don brakes clutches and the like are these codes something i can fix or is it a dealer repair probably? also the check engine light is on currently and its running rough and dying thanks mark

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172 is caused by a rich fuel mixture on the right side. It may be caused by a fuel injector not closing fully. Dirt particles can do this. Adding Gum out may help. The other engine codes, 306 and 340 is for missfire which the cam sensor is at fault

Posted on Jul 16, 2010

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Posted on Jan 02, 2017

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03 trailblazer will not fully turn over and run. I can get it to start for a few seconds by pumping pedal but missed out really bad and then shuts down with service engine light on


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03 chevy trailblazer, hooked up a code scanner and shows multiple random misfires doesn't give specific cylinder. p0300 code. I changed the spark plugs. no help.


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Smart man using a scanner for the actual temp. Assuming you're not losing coolant....2 things I'd look at here, 1st is you may have air in the system, make sure to purge all the air. 2nd is your fan clutch, I've replaced a few fan clutches in my own Trailblazer. Have had them bad right out of the box brand new. Have had bad brand new fan clutches on 2 of my last Trailblazers. You should hear it engaging especially in stop and go traffic.

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What has to be done to turn off sevice engine soon light ? THIS IS ON A 2003 CHEVY TRAILBLAZER.


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My service engine light on the dash has come on and stayed on. We took it in to have it hooked up to find out why the light is on. The guy told us there might be a fuse out some where because when he...


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1 Answer

How do you check if altenator is charging battery,


Most vehicles if you get the car running and unhook the positive battery cable it will stay running that is because it is running off the alternator. if it dies like your talking about I would most definitely say your alternator needs to be replaced. Most likely when you jumped your father in laws pick up there was a bad ground somewhere and your alternator got a surge of electricity and it fried it. Hope this helps.

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