Chevy Express 2500 Check engine light on P0300 code.

Discussion in 'Chevy Express Forum (GMC Savana)' started by Hvac Bob, Feb 27, 2016.

  1. Hvac Bob

    Hvac Bob New Member

    Hello all, just wanted to let you all know that I have had problems with my Chevy express van 199284 miles in the past. Check engine light on. I went to Auto Zone and they told me the error code was P0300. I read multiple posts about people replacing costly parts and not solving the problem. Just wanted to share what has worked for me. I'm not an auto mechanic but I am pretty handy. Replaced spark plugs and spark plug wires. No change. Emptied gas tank and added fresh gas. Also replaced gas cap. Engine check light went away. A year later, same thing but could not get it to clear. Went to Auto Zone again. Same P0300 code but they said it was valve cover gasket. Read another post and they recommended to clean maf sensor with maf cleaner spray. Removed assembly and cleaned. Also cleaned air filter(not really dirty)with compressed air. Restarted and drove a couple miles and check engine light went out. So far so good. Thanks to all who have posted. Hope this helps.
    RayVoy likes this.
  2. Polar Express

    Polar Express New Member

    I've been fighting my code p0300 for about 3 years. Did the gas cap, spark plugs, MAF cleaning, and finally the dealership fixed it. I was pushing for a smoke test, to try and find an intake manifold leak. The dealership didn't want to do the smoke test.
    They were very confused, and one mechanic there remembered a similar problem on a chevy pickup. Seems that the crankshaft position sensor can get out of range (possibly as the timing chain stretches a bit), and this will cause this code. So they hooked up the computer, told the van's ECU that the existing crank position was OK (within range). This seems to have solved the problem. Hopes this may help someone else some day.

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