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P0128 Diagnostic Trouble Code Discussion for January 2009

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2004 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13S14
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. hello fellow techs need help have a 2004 trailblazer with a 0068,0172,0128 code followed diag. tree from alldata with no conclusive answer to the problems. did unplug map sensor seemed to run better but not 100% ect reads correctly rpms do fluctuate no power,s...
January 02, 2009
2004 Chevrolet Trailblazer LS 4.2L Surge, Cuts out, MIL Lamp on VIN: 1GNDS13S24
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. Customer brings this trailblazer in on a trailer his expanation is he was on the interstate about 65 mph the engine light came on but ran just fine. went another 15-20 miles and vehicle lost all power wont go over 5 mph. codes are po1171 system lean on acceler...
January 19, 2009