Code 300 2005 GMC 4.2 envoy What does this mean?

Greg Bernett

• 2993 Answers
• Posted on Aug 28, 2009

SOURCE: GMC Envoy w/ code P0128

Start at $89 right off the bat just for diagnostics and then depending on what they find that is causing that fault, at LEAST one hour labor, plus parts....I would say $250 is a good ballpark figure....looking up your fault code now.

SOURCE: what dus the code 1516 mean on a 2003 gmc envoy

That code is for throttle body or tac module check wiring for throttle body or could be bad throttle body

SOURCE: I have a 2004 Gmc Envoy putting out a code of 0128

It means the car has not reached operating temp. The computer wants the engine a certain temp so it can go into "closed loop" where it fine tunes the fuel mix for optimum economy and emissions. If it cannot reach that temp it sets that code. You either have a low coolant level or a stuck open/missing thermostat.

SOURCE: 2004 gmc envoy code 0128

This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

SOURCE: I am having problen with my 2003 GMC Envoy. The

This code indicates that the coolant has not reached operating temperature, this is usually caused by a stuck open thermostat.