Duramax Lifetime Supporter
Join Date: Oct 2016
Location: Maurice, LA
And replace all of them at the same time.
My experience is different, Ive replaced only 2 that failed and the rest are doing fine. The GPs are not like spark plugs in a gasser, they work only for a short period of time each cold start.
I would recommend that while you are in there remove all 4 on that side and put some good thread anti seize (I like Kopr-Kote) so the threads will not seize later.
and if you cannot get the GP out even with the extractor you can put a 3.5 ohm on the end of the GP lead and ground it. This will trick the GPCM into thinking the GP is there and working. MUCH less cheaper and quicker than a head removal.
2008 Silverado 2500HD CCSB LTZ Diesel
FASS 95 Lift Pump (with Baldwin filters), Edge Insight CTS Monitor on a Windshield Mount, Nicktane Fuel Filter Adapter w/ CAT 306-9199 UHE tertiary fuel filter, Bilstein 5100 Stock Height, Bushwacker Bed Rail Caps, AMP Research Bedstep, Fumoto oil drain valve, Dorman PS Oil cooler, Pioneer AVIC 7200NEX GPS/Stereo, Air Lift LoadLifter 5000 Air Bags.
Last edited by 407driver; 01-16-2020 at 05:39 AM.