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P0128 Diagnostic Trouble Code Discussion for April 2009

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2005 GMC Envoy SLE 4.2L Cuts out, Misfire VIN: 1GKDS113S5
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... cylinder #2 misfire and p0128 coolant thermostat. Replaced all 6 spark plugs with AC delco plugs and replaced ignition module coil #2. Fault came back after 3 miles, now the car stalls on the road but it starts back up. ...
April 27, 2009