2003 Hummer H2 Logo
Anonymous Posted on Mar 08, 2010

Check engine light is flashing, and engine seems o.k. but seems like transmission slips before shifting. or hesitates to shift. I checked the engine oil and the transmission fluid. they are both o.k.

  • Anonymous Mar 09, 2010

    MY 2003 H2 STARTS AND RUNS. BUT ONCE I GET TO 25MPH IT DOES ACCELERATE BUT REFUSES TO GO ANY FASTER. IT ACTS AS IF THE TRANSMISSION IS SLIPPING OR POPS OUT OF GEAR. THE CHECK ENGINE LIGHT IS FLASHING. I CHECKED ALL THE FLUIDS AND SEEM TO BE FINE. I ALSO PULLED THE MASS AIR SENSOR AND SPRAYED IT DOWN WITH CARBURATOR CLEANER. I ALSO REPLACED THE SPARK PLUGS AND THE PCV VALVE AND THE LIGHT REMAINS ON. I USED MY AUTO SCANNER AND I GOT A P0300 CODE. I WILL REPLACE THE SPARK PLUG WIRES TOMORROW. BUT I DONT THINK THIS WILL AFFECT THE WAY IS SHIFTING GEARS. WHICH SENSOR COULD BE CAUSING IT TO INTERFERE WITH THE ******* OF GEARS?

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Anonymous

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  • Posted on Mar 09, 2010
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The check engine light can also mean you have a transmission problem which would be my guess. You need to have the ECU scanned with an OBD2 scan tool. This will bring up the code that has been stored by the computer. It could be minor and could be serious so do not ignore this or you may end up with a very expensive transmission repair. A professional can take the code and know where to look for the problem. Transmission repair needs to be done by a pro, as this is not a DIY repair. Stay away from chain transmission shops. Seek a trusted pro that family and friends recommend or take it to the dealer who sold you the car. Good luck and I hope it is nothing serious.

  • Anonymous Mar 10, 2010

    There is not sensor causing this. This is an internal transmission problem. You need to seek a professional's help. This is not a DIY repair unless you are knowledgeable with electronic transmissions.

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  • Posted on Mar 08, 2010
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There are many probable causes for this problem, you said checked the transmission fluid and it looked OK, first thing you should do is to make sure the fluid quality and level is good if positive and still having problems I recommend changing the fluid and fluid filter. If the problem still persists, then it might be caused by Transmission Control Module, a sensor or solenoid, or the circuit itself ( you mentioned the flashing engine light, the problem can be caused by a faulty sensor or circuitry). if the first simple remedy doesn't work I recommend taking the car to a professional to have a look at the probable problematic parts I mentioned. Have a look at it and let me know if you need more advice. Best

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http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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