there is a Technical service bulletin for this problem, the number of the TSB is 01575, TSB Date:January 1, 2004
It has to do with engine valve seating problems.
SOURCE: P0300 code reading on Chevy aveo. Engine light
Pull out your spark plugs. Change them if dirty. There might be a problem with the fuel trim, thats causing spark plug to foul up prematurely. A stucked open EGR valve can also cause a multiple mispfire code(P0300) but then it would be accompanied by an EGR code(P402) which means excessive flow detected. Anyways if was indeed a fouled up spark plug change them as well as the air filter.
SOURCE: 2005 aveo got code on transmishion p 0300 p 0700 and p1781
It sounds like you have a problem with your crank sensor or cam sensor!! You will have to take to a dealer that knows how to learn the crank sensore.. Yes it has to be learned into the computer.
Also there was a sevice bulletn on mising being that the intake valves needed to be replaced and reseated.
The transmission code is being sent because of the randome missing.. so it will not upshift into I think 4th (lockup). and the other is sent to torque because of the random miss also..
Solution!!!!!!! take to dealer and have them relearn crank sensor!!!
Hope this helps
SOURCE: 2005 chevy aveo dtc P0300 and Hold light flash
Aveos had a service bullatin for some 04 and 05 models. Bad valves, had to have head reworked and solved problem. took car to 3 chevy dealers to find problem..
SOURCE: 2005 chevy aveo Check engine and hold light comes on only over 60
I've become SO FAMILIAR with this problem on my own Chevy Optra. The first time it happened, I took it in to my dealer. It cost me over $100 and I SWORE it would never cost me that again. It really IS the fuel system. (Sticking with Shell's "detergent" gas doesn't help!) Simple solution is to add a bottle of fuel SYSTEM cleaner (not just the fuel injector) and the FIRST sign of trouble or with each oil change. No more problems !! "Live and learn and pass it on !"
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