Question about 2005 GMC Sierra 2500HD 4WD

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Engine light on still for knock sensors

Changed both knock sensors and the harness and clear codes, but then engine light comes back on after driving for about 20 minutes, with same codes 327 and 332.

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6ya6ya
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Posted on Jan 02, 2017

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mechanicm639
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SOURCE: engine light/ knocking sensor

The knock sensor is for the timing advance on your envoy. It will not be related to your sparkplugs. Your knock sensor will be screwed into the engine block, or under the intake depending on model. The V8 engine is under the intake.

Posted on Apr 30, 2009

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SOURCE: trying to locate where the knock sensor is located on the engine.

on my 1990 gmc its right be hind the starter its round and has a one wire plug becarful some have left hand treades and coolant willbe comn out i would do it while it was cold

Posted on May 31, 2009

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SOURCE: 2003 GMC Sonoma 81000 miles

CODE PO155 - HO2S 21 BANK 2 SENSOR 1 HEATER CIRCUIT MALFUNCTION CONDITIONS.CHECK O2 SENSOR FUSE AND WIRING CRCUIT BEFORE BUYING A NEW HO2S.IF SENSOR BAD REPLACE IT.THEN YOU CAN CLEAR THE CODE.

Posted on Aug 19, 2011

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2 Answers

Ok had the codes come up for both crank sensors on our Pontiac Montana and knock sensor, replaced all three sensors cleared codes and the check engine light keeps coming back on after clearing codes, for...


I guess you do not know that OBD Codes have
nothing to do with replacing parts

The Codes are used along with the diagnostic
info & charts to check the system that set the codes

Only component testing will find a problem

You used the name of a codes to replace a part
with a similar name

I would guess you did no testing & have no idea why the
fault codes were set, so you found no problem, thus you
fixed nothing & the MIL Lamp is still on

You Cleared ALL DATA needed to help diagnose the issues

You lost your codes & freeze frame data at the time the codes
were set & your lost your emission monitor data

Now you get your codes & write them down
Google the codes & study the possible cause
& solutions

TYPE: OBD & your codes

Need to study OBD Vehicle Systems

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My 2006 VW TURBO TDI is sick- Help me


Changed the timing belt and knocked loose the wires or connections to the sensors on the mass airflow device.

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98 Nissan Maxima - Check Engine Light, Knock Sensor


If the car is pinging you will set a knock sensor code.'
This comes from bad gas and running lean., You really need this professionally inspected to rule out the basics. I have seen alot of nissans with the knock sensor code stored but the light is still off.
Fill up the tank with high octane chevron and some techron injector cleaner and clear the light. If it stays off for a couple days then go get it inspected. Even if the code is stored it will still pass as long as the light is still off and the monitors have run.

Jan 04, 2010 | 1998 Nissan Maxima

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Where is the knock sensor and how do you replace


The knock sensor is most likely ok you need to do a top engine clean to get the combustion chamber presure down so the knock sensor can ****** the timing enough to not knock or ping, You may not here the ping but the knock sensor does. Go to a GM dealer and buy a can of top engine cleaner warm the engine up and pull vacuum line off the back of the throttle body and allow it to **** the full bottle into the engine then kill the engine. let sit for 20 minutes hook up vacuum hose start the engine and rev it up to where it will still run let it run for 10 minutes till smoke clears out then take it for a test drive after you drive it 10 or 15 miles you should notice the check engine light not cumming on and the engine ill run smoother and the fuel millage will go back up, afterwords change the motor oil and filter to get rid of all the carbon down in the oil pan. If this does not fix it then change the knock sensor, it has 4 wires running to it and is on the side of the block left side. If you replace it be sure not to tighten it to tight if fact use a tork wrench to tighten it or you will break the ceramic disc inside the sensor.

Oct 09, 2009 | 2002 Chevrolet Silverado 1500HD

2 Answers

Check engine light keeps coming on...test says its from the knock sensor...sensor has been replaced, but check engine continues to come on...have always used premiun gas...do have a airaid cold air...


it could be that the wiring to or from the knock sensor has a prob. also after the knock sensor was changed was the code cleared? if it was not it may be a inactive code that stays in the computer causing the light to stay on...

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P0340 CODE COMES UP,SENSOR REPLACED CODE STILL COMING BACK.IF ENGINE IS REVED ABOVE 1500 DASH LIGHT GOES OUT BUT WHEN ENGINE IDLES DASH LIGHT COMES BACK ON.


i have 2000 cadillac deville runs really good it has a po340 engine code runs good b when i come to a complete stop the engine idles up and down only at a complete stop what do i need to do

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