Question about 2000 Chevrolet Blazer

1 Answer

Service light stays on

I just got my transmission replaced(rebulit) and the lighf can on after the job was done. so i brought it back and i was told it was an old code for the trans. they reset it. 2 days later and it has come on again. Should this be happening or should i be worried about the rebuild of the trans. i am going to have the codes read at an auto zone to double check the codes.any help will be appreciated. thanks in advance

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  • jack reese May 02, 2013

    sorry that was the service light came on after the job was done

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  • Chevrolet Master
  • 21,873 Answers

No the check engine light should not be on. We won't know what the problem involves until you get the codes.
And keep in mind, trouble codes only tell the mechanic what to test, not what to replace.

Posted on May 02, 2013

Testimonial: "i did bring it back to where i had the job done and i was told it was an old code for the transmission from before it was fixed."

  • jack reese May 02, 2013

    do you know if old codes should pop up after the problem is fixed

  •  Stephen
    Stephen May 02, 2013

    On vehicles built after 1995 a trouble code stays in the system until it is erased. But an old code should not turn the warning light on. If the code is there and the light is off, that code should not turn the light back on again.

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You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.

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Posted on May 13, 2009

Molson02536
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SOURCE: p0455 comes back on ,we try to fix it

The EVAP control sytem is checked by the ECM upon the first start of the day when the engine is cool and will trigger the DTC code P0445. If you have a vacuum line leak when it's cold and seals it self when it warms up then the code will stay there. After warming up the car reset the ECM to clear any DTC codes and see if any MILL shows up. IF not then there is a leak only when the system is cold so your going to have to try to do a smoke test when the system is cold.
The other thing is to check all the vacuum lines and fittings around the canister and fuel tank for any lose clamps ECT.
Good luck and keep me posted. Be glad to help you 

Posted on Jun 01, 2009

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SOURCE: My check engine light kept coming on and they

Could be a wiring issue, fuel cap got left off, fuel pressure sensor again or loose connection to the sensor and one of the other Evap hoses. Also might try changing the fuel cap. Look at the underside of the fuel cap and if there are cracks in the sealing rubber, replace the cap.

Posted on Dec 09, 2009

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