If you have a code for the knock sensor, it could be a problem with the sensor itself (easy to fix, just replace it) OR it could mean a problem with engine knock - that could mean timing is off, a sign of a failing timing chain. A knock sensor can be tested but requires specialized tools not commonly found in the home garage. Take it to a garage and have them diagnose the problem.
2004 Hummer H2 Base
-
Shopping & Pricing
I have replaced gas cap 4 times since 2003 and this has cleared engine light problem each time. However most recent gas cap change has not remedied engine light. Any suggestions?
2003 Hummer H2
-
Maintenance & Repair
2006 Hummer H2
-
Shopping & Pricing
i am looking at buying H2 with low milage with rear entertainment and suspension.Please let me know if you have anything available currently.
Hummer H2
-
Shopping & Pricing
At one period of time you could have bought a car from a private owner of a good dealer but now these car dealer is taking over and all the cars is way to high now with high mileage.
Hummer H2
-
Shopping & Pricing
Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.