Knock sensor. Please help!

Asked by Jun 22, 2017 at 02:29 PM about the 2010 Chevrolet Cobalt

Question type: Maintenance & Repair

hey guys was wondering if you can help me out, I have a
2010 cobalt LT and the check engine light came on
recently so I pulled the codes and p0327 came up and
said it might be the knock sensor, a knock in my engine or
low fuel pressure. I dont really hear a rattle coming from
the engine and after I pulled the codes the check engine
light turned off. Maybe it's a bad connection with the
sensor?? Any help is appreciated and thanks in advanced
guys

8 Answers

5,085

Maybe. A bad connection could show up as a failed sensor. Check the connection and drive it for a bit. Then scan for codes again. If it shows a failed sensor again, you might want to change the sensor. If it says low fuel pressure you might want to check your fuel pressure and correct it if it's low.

Any luck with this problem? I have the same issue.

5,085

Did you trouble shoot your fuel system and change the knock sensor?

I have replaced tbe sensor, sensor connection, tested sensor wires for conductivity as well as output voltage. Still get the code like clockwork on every start for the last year.

Fuel system, no, could that affect this?

5,085

I haven't researched it myself, but the original poster said one of the possibilities was low fuel pressure. Wouldn't hurt to check that out. I've also noticed a number of threads here where problems were solved by cleaning up, tightening and occasionally rewiring and even adding grounds. There are several on that car and some seem to degrade over time. Modern auto electrical systems are extremely sensitive to things like bad grounding, so that might be worth looking into. Spend a little time reading through some of the other posts on this site regarding Cobalt issues. You might find some more clues to follow.

Thank you sir

Finally solved. Wiring harness wore through where it was touch on the oil filter housing. It was shorting to ground through the engine. Repaired wire and sll good.

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