General Hummer Talk Good at troubleshooting? Have a non specific issue? Discuss general tech topics here.

Check Engine code P0033

Old 11-15-2009, 01:08 PM
Junior Member
Thread Starter
Join Date: Nov 2009
Posts: 16
Default Check Engine code P0033

I got a scanner at Walmart.

Plugged it in, saw code, then cleared the code.

So I am guessing at what the code was but I think it was P0330.

it said "P0330 Knock Sensor 2 Circuit low voltage (Bank 2)"

Is this something that may cleanup with Injector cleaner run through the fuel system?


Last edited by therobesons; 11-15-2009 at 01:30 PM.
Old 11-15-2009, 06:22 PM
2wheelmonster's Avatar
Senior Member
Join Date: Jan 2009
Posts: 1,438

A knock sensor to my understanding is to monitor the camshaft or the crank as it spins. I'm not a 100% on this, but I do know that injector cleaner will definitely work. It's like an O2 sensor, when it says low voltage it usually means the sensor is bad. I found that going to the autozone website and looking up the parts they also have pictures with it on where it is located on the engine, so that should give you a good idea on what to look for.
Old 11-17-2009, 08:49 PM
Junior Member
Join Date: Oct 2009
Posts: 1

The Knock sensor is under the intake and a pain in the butt to change. Mine was acting up for awhile before I changed it(about 6 mounths). The bad thing is I belive it cased my catilitic converter to go. They go bad from water/mud settting down in the intake valley. It's a bad design from GM on the 6.0 and other engines. Took me about 3 hours.
Related Topics
Thread Starter
Last Post
Hummer H3
11-18-2014 12:48 PM
Hummer H3
03-29-2013 02:34 PM
Hummer H3
01-19-2012 10:14 AM
Hummer H2
09-24-2011 10:14 PM
Hummer H3
02-15-2010 08:57 AM

Thread Tools
Search this Thread
Quick Reply: Check Engine code P0033

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.