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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We just bought a used 2001 Hyundai accent from my girlfriends cousin. it was heavily misfiring when we bought it.we changed the spark plugs and the wires and it worked fine.not even a day later the engine...

First of all did you check all fuses if so that ok, next did not mention changing crankshaft sensor. When you remove ht leads that go to spark plugs are they sparking use rubber handled pliers to do this or you will get a shock, if they ok did you set the clearence on the new plugs correctly?. also when cranking check with magni-stick pen to make sure injectors pulsing ie;getting signal. also immobilizer could cause engine to to start,usually light will flash on display to tell you this.last thing just make sure timing belt not snapped usually heard by engine turns faster than normal.

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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
Spark plug
Clog or dirty fuel injector
Evap canister purge valve
Engine Compression
fuel pressure

you have 3 type of engine for your truck
2.3L 4 cylinder
3.0L 6 Cylinder
4.0L 6 Cylinder

need to know that type Engine

The reason why the service light come on because it is a hard code
not a soft code.

Let me know

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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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