P0306 code on an 01 grand prix gtp what would cause this. I have already replaced plugs and coil packs to no avail. Any ideas?
3 Answers
Plug wires just replaced and new injector on #6 and has good compression
I had my computer replaced and right after after that kept getting this code. Did coil, wires, plugs and still got P0306. Brought the car back to place that installed the computer and they re flashed it. So far the code has not come back. Understand a signal is sent from the computer to measure rpm of cylinders. This code means cylinder #6 is more than 2% off from the rest of the cylinders. More than 10% off the check engine light will flash. Just something else to consider. My dealer wanted $110 to re flash my computer which means you can get it done cheaper some where else.
