Question

2003 Chevrolet Tahoe 5.3L Flex Fuel with engine code P0300. Spark knock under load

Answer 1

Hi there,

This code indicates a misfire on random cylinders. Here is a list of possible causes.

P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders
Read more: https://www.autocodes.com/p0300_chevrolet.html