Question about 2006 GMC Envoy Denali
Make/year GMC 2006, MODEL/BODY E/L 4W
Posted by Anonymous on
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Posted on Jan 02, 2017
this is a giant comon problem right now with gm vechiles it is in the fuel sending unit the unit needs to be replaced ( about 400$) and the gas tank needs to be dropped out to get to it for many more people with the same proble go to topix.com there is about 96 of us with the same problem
Posted on Mar 27, 2009
Cleaning the throttle body is certainly the right thing to try first. Make sure you clean the throttle plate as well.
Posted on Nov 29, 2010
Testimonial: "Thanks. It seems to have worked."
Ah the famous P0128.....It's 1 of 2 things. If your fan is not engaged constantly (would sound like an airplane or big rig everytime you step on the gas) and is working properly, that rules out the fan clutch. The other common problem is the thermostat. Replace the thermostat and the code will go away. Engine temperature needs to be at 210 degrees on these engines. If the fan clutch is constantly engaged, it's cooling the engine off constantly and won't get up to 210 fast enough. If it's the thermostat, it's stuck open and isn't allowing the coolant to properly heat up in time.
Posted on Feb 09, 2011
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