× 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 February 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
2003 Chevrolet Silverado 1500 4.3L Excessive Emissions, MIL Lamp on VIN: 2GCEC19X63
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... bodyshop has had a ses light on & code P0128. The body shop replaced coolant temp sensor but no change. My snap-on scanner shows ect -40 degrees, intake air temp -40 and baro -.55 volts all the time. Tested for 5 volts from signal circut at ect harness...
February 22, 2005