Question about 2000 GMC Sierra C/K3500

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What does trouble code P 0236 mean? - 2000 GMC Sierra C/K3500

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I have a 2000 3500 with a 6.5. The code 236 is - boost sensor #1 out of range. Usually it is not the sensor itself. In my case it was the vacuum pump had gone bad. No or low vacuum will cause the 236 code to set. Check for vacuum at the wastegate actuator. Disconnect the vac hose going to the diaphram actuator on the wastegate on the turbo and hook up a simple vac gauge with the engine running. Load the engine ( in gear- foot on the brake) If no vacuum check for kinked/broken vacuum line. If line is good you probably have a worn out vac pump. Rebuilt-$75-100. If you have vacuum and actuator doesnt move with change in engine loading then your wastgate/ actuator is bad- stuck or bad diaphram. My truck blew very thick black smoke even up a mild hill. After changing out the vac pump the power is back and no black smoke. Hope this helps you. Have a good one.

Posted on Sep 08, 2010

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I dont know if there is a P0236 are you sure? what engine?

Posted on Sep 02, 2010

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