× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0128 Diagnostic Trouble Code Discussion for December 2005

Thermostat System Malfunction

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2001 Chevrolet Impala 3.4L Cooling fans stay on VIN: 2G1WFSSE61
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. I have a 2001 impala that the cooling fans stay on low speed and the ecm keeps alive for 3 min after the key is shut off. no other components seem to be alive. Is there a doide or an ecm problem doing this to me. Thanks in advance for any help.
December 02, 2005
2002 Mercedes-Benz C230 Kompressor 2.3L MIL Lamp on VIN: WDBRN47J42
P0128: coolant temp below thermostat regulating temp. vehicle came from other shop. it has a dtc po128 low coolant temp, it had the e.c.t allready replaced i asume it's an oem part the scanner reads 195f (90c) fully warmed up, ispect thermostat ind it was open, i left it on the fridge for 5min. and it was complet...
December 07, 2005