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P0128 Diagnostic Trouble Code Discussion for February 2015

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2013 Chevrolet Silverado 1500 LTZ 5.3L MIL Lamp on VIN: 3GCPKTE79D
P0128: eng wont reach operating temperature. ... V8 Silverado. It keeps coming back with this P0128 and will not reach operating temperature as far as I am concerned. It will pass the code test after thermostat replacement - but barely. I did not see anything wrong with either thermostat. It does not ...
February 11, 2015
2004 Chevrolet Silverado 1500 4.8L MIL Lamp on, Low Engine Temp VIN: 1GCEC14VX4
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... shop had essentially given up fighting this repeat P0128 Failure. The other shop had supposedly replaced the thermostat multiple times as well as replaced the ECT Sensor. We first verified that the engine did take a long time to heat up. We removed the the...
February 16, 2015