Question about 2002 GMC Envoy
P0128 is a code for low coolant temperature. This is a fairly common code on the Envoys/trailblazers. The usual fix is to replace the thermostat. This is not a DIY friendly job as some of the work needs to done from the top and some needs to be done through the drivers side wheel well. The thermostat and housing will be on the drivers side lower front of the engine kind of behind the a/c compressor. It is a real bear to do!
Posted on Nov 07, 2010
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Posted on Jan 02, 2017
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