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P0128 Diagnostic Trouble Code Discussion for July 2011

Thermostat System Malfunction


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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2005 Pontiac Montana 3.4L No Start, Cuts out VIN: 1GMDV23E65
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... Customer stopped for a bag of bagels and vehicle would not start after numerous attempts. When AAA showed up it started and he drove to my shop. I was able to start it only after numerous attempts. The first set of codes were in there for 6600 miles - cus...
July 05, 2011
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S84
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. This vehicle came in for SES light no driving concerns. Unit was not getting up to temp, replaced thermostat to get temp upto spec, t-stat was visibly stuck open. Tested and replaced secondary air pump shutoff valve-ok. Now the big problem we are having is tha...
July 07, 2011
2006 Ford Fusion SE 2.3L Hesitation VIN: 3FAFP07Z6R
P0128: coolant thermostat. Hey guys . I have this fusion with the Trans Throttle wrech light on.Customer said it just popped on while driving.There are no throttle or trans codes.IT feels like it is starting off in second or third gear.I researched the archives and there were alot of th...
July 26, 2011
2005 Pontiac Montana 3.4L No Start, Cuts out VIN: 1GMDV23E65
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... Customer stopped for a bag of bagels and vehicle would not start after numerous attempts. When AAA showed up it started and he drove to my shop. I was able to start it only after numerous attempts. The first set of codes were in there for 6600 miles - cus...
July 05, 2011
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S84
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. This vehicle came in for SES light no driving concerns. Unit was not getting up to temp, replaced thermostat to get temp upto spec, t-stat was visibly stuck open. Tested and replaced secondary air pump shutoff valve-ok. Now the big problem we are having is tha...
July 07, 2011
2006 Ford Fusion SE 2.3L Hesitation VIN: 3FAFP07Z6R
P0128: coolant thermostat. Hey guys . I have this fusion with the Trans Throttle wrech light on.Customer said it just popped on while driving.There are no throttle or trans codes.IT feels like it is starting off in second or third gear.I researched the archives and there were alot of th...
July 26, 2011