Question about 2002 Chevrolet Blazer

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CODE PROBLEMS 2OO2 CHEVY BLAZER, KEEPS STALLING, CODE P1639 COMES UP WITH ONE OF THOSE TESTER THINGS, IM A WOMAN AND DON'T UNDERSTAND WHAT THAT MEANS. CAN SOMEONE HELP ME THANKS KIM

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  • KIMKPURPLE Jun 12, 2008

    it happens the most when im driving down the road and take my foot off the gas and coast for a short time

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  • 87 Answers

Transmission problems take it to a transmission shop most likelt the torque converter

Posted on Jun 12, 2008

  • Danny Taylor Jun 14, 2008

    ok I was mistaken after research the code is a computer malfunction you are going to need a computer it is located under the fill bottle on the side under the hood you should be able to get one from a salvage yard for 100 or less thanks...

    P1639



    Vehicle ID Block Corrupted or Not
    Programmed




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1999 chevy siverado 4.8l diagnostic tester says i have po300,po121,po122,po440,p0449,po452 and gm p1639


Maybe.
Codes 121 and 122 are for the throttle position sensor circuit.
Code 400 is EGR and codes 449 and 452 are for the EVAP system.
Code 1639 is for a problem with the 5 volt reference circuit from the engine computer.
The throttle position sensor could be failing which could prevent the gas pedal from working. And the 5 volt reference problem could shut down the computer which would kill the engine. EGR is an emissions component and EVAP is the system that vents gas fumes from the gas tank.
Codes are only a guide for a mechanic to troubleshoot the circuits involved. They do not mean a component is faulty.

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p1639 is low a/c refrig. so that's not it. p0113 is low intake air temp. which is telling the computer its -38 f. This can cause the idle to be raised. and p0401 is EGR flow test failed.
Can you post what motor this has 3.8 liter or the 3.4 liter. This is something that we need to know.

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I have a 2003 Chevy ZR2 Blazer and when i get over about 40 miles per hour the service engine soon light starts flashing what could that mean


There is to many things that can cause that issue from engine to transmission. If there is an Auto Zone around your area, have them scan your Blazer for the DTC codes.
They scan free of charge and can give you the recommendation to what issues needs to me addressed. Keep me posted with your DTC codes, be glad to help you get your Blazer running 100% again soon.
Thank you for using fixya and be safe

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Free things to try: Take it to Auto Zone or some auto parts store and they can check the battery, alternator, and hook the thing to their computer to look for trouble codes for you.

Things you have to pay for: Take it to the auto shop and have them check the timing, spark plugs, and they can translate the trouble codes into language you understand.

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I started my 2000 chevy blazer this a.m. It remained started for 20 minutes. When I put it in reverse it shut off. It cranks but will not turn over. It have sat all day an does the same thing. My service...


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Does vehicle also stall in Drive?

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