Question about 2004 Chevrolet TrailBlazer

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Check engine light is on after battery change

When I changed the battery, the wires sparked. Later after the new battery was installed, the check engine light lit up on the dashboard.

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  • Anonymous Mar 14, 2014

    After replacing the battery

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You caused a default in the computer, remove the positive cable for 10 mins to reset the computer, this will solve your problem, make sure you do not have the keys in the car when doing this.

Posted on Nov 26, 2008

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Have you checked the spark plugs since the light came on? you say that you belive they caused the light to come on? If this is true, are you sure that you spaced them properly? Proper spacing is crucial to making sure they fire correctly and every time. Also, are the correct wires put back in the correct firing order? If all this has been done correctly, take a look at the spark plugs. Do they still look new? Are they covered with oil or early signs of excessive corrosion? Appearences by any of these could point to problems with gaskets. Hope this helps.

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Code P0301
Ignition Coil Pack
Ignition Cable
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Engine Compression
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you have 3 type of engine for your truck
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4.0L 6 Cylinder

need to know that type Engine

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yes i would change the plug wires , you can take a spray bottal with water and spray that wire, and if it starts to run real bad then it is shorting out, you may also have a injector going bad you can test this buy puting a ohms meter on it and ck the ohms it should read the same or close to the same as the other if not it will need replaced

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