Question about Chevrolet TrailBlazer

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2005 trailblazer check engine light on

The check engine light on my 2005 Trailblazer came on. Gas cap screwed on tight- what other quick things could I try before taking it in?

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  • paulnancyj May 03, 2009

    I just bought the truck and light cam e on. Thinking of stop payment on check unless there are simple explanations. What are possible problems?

  • jed803 May 09, 2009

    I have a 2003 trail blazer with the same problem. I have replaced the

    cap three times and both oxegen sensors. This problem comes and goes, sometimes it is the gas I use and sometimes it is because I

    find the cap needs to be retightened. It is very frustrating, but does not seem to affect the performance of the engine. I think it is related

    to a fuel tank sensor. This has gone on for years.

  • Pat_Riot May 12, 2009

    I notice my check engine light comes on after accelerating quickly (like when passing others on the highway). It stays on for about 24 hours then goes away. Any ideas?

  • Anonymous May 13, 2009

    I have the same problem with my 2003 EXT Trailblazer, check engine light will not go out at all now. On my third gas cap, all started around the time I had my fuel pump replaced because of gas leaking from fuel pump, started with gas smell and got worse. GM will cover this up to I believe 7yr 100,000 miles. Very unsafe to opperate, anyway still trying to find a good expalation to this MAF or VAF P0101 code, mechanic can not find anything else wrong but this. If anyone found a solution please respond.



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Verify any "check engine" by first resetting the computer then waiting to see if it returns. To reset the computer, disconnect the battery cable (some say either cable, I say positive{red} cable). Leave the cable disconnected for about 30 minutes then reconnect it and start the engine. Because the cable was disconnected from power for a while, the computer will have to reboot upon startup. Just like any computer, sometimes a reboot will solve the hangup. If the error returns, it is likely a sensor is bad or the sensor is indicating a true problem.

Posted on Jul 22, 2009

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I have a 2003 Trailblazer and the check engine light came on less than a month after I purchased. It has been coming on and then going off for over a year now. It usually doesn't come until until you hit 70 MHP on the highway and then will go off in a day or so. The code is a 1028 which is the thermostat or the ECT senor. Both parts are inexpensive but a bear to fix.

Posted on Jan 17, 2010

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If it's the cost your worried about, I'm told Autozone & Pep boys will scan for codes free of charge, then you can pinpoint from there.

Posted on Apr 16, 2009

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