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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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

Could be a lot of different things have someone take you to AutoZone or similar and either purchase a obd scanner worth the price. You can even maybe use the loner tool program and borrow one. Take it home and scan vehicle for codes this will give you a idea what is wrong.

Feb 13, 2017 | 2003 Chevrolet TrailBlazer

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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.

Pull the coil plugs when running. One at a time. If the engine gets worse the coil is good. No difference. Most likely the coil is bad. To check it again, swap it with another. Pull the plug on the suspected bad one. If it gets worse, look to wiring at the one that was no deference. Check for power to the plug.

Dec 23, 2016 | 2003 Chevrolet TrailBlazer

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2003 chevy trailblazer cooling temp running 230

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.

Aug 02, 2016 | 2003 Chevrolet TrailBlazer

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

You can buy a hand scan tool and turn it off. If you can't get a scan tool, you can remove one of the battery cables and wait for 10 mins before hooking it back up. But keep in mind that you need to reset the radio and clock

Jul 25, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

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...

just make sure your gas cap is on tight there is no fuse...i wish everything could be fixed with fuse..the gas cap is the number one trouble code for the light just drive it a couple of miles and see what happens.they have a rubber seal that once warn has air leak making light come on good luck

Jan 31, 2010 | 2003 Chevrolet TrailBlazer

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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