OBD II Trouble Code Po128 - Chevrolet Forum - Chevy Enthusiasts Forums

OBD II Trouble Code Po128

Join Date: Mar 2010
Posts: 2

March 13th, 2010, 8:53 PM   #1  
CF Beginner
OBD II Trouble Code Po128

Getting trouble code P1028. Have replace the ECT. Cleared code and less than week later code back. Temperature guage appears normal (~195 degrees when warmed up). Is there another temp sensor somewhere as the code will clear on its own if the outside temp is below 45 degrees. Manual states that ECT acts as both the temp sending unit and input for PCM. What should next step be?

2006 Silverado, 4.3L V6 with approximately 85K.

Last edited by jcolpaert; March 13th, 2010 at 9:52 PM. Reason: Adding truck information
Join Date: Jan 2010
Posts: 85

March 13th, 2010, 8:55 PM   #2  
CF Junior Member
year make model of truck

Join Date: Dec 2009
Posts: 1,854

March 13th, 2010, 9:04 PM   #3  
CF Veteran
yeah, we're gonna need the vehicle specifics. typically tho, there is a sending unit for the gauge, and another sensor for the ecm.

Join Date: Nov 2008
Posts: 2,955
Bowie, MD

March 13th, 2010, 9:43 PM   #4  
Super Moderator
Professional Mechanic
Replace the t-stat. 99% of the time it takes care of the problem.

Join Date: Mar 2010
Posts: 2

March 23rd, 2010, 12:10 PM   #5  
CF Beginner
Thanks. Thermonstat replaced and problem solved. Suspect old thermostat was opening too soon. Thanks again!

Join Date: Mar 2010
Posts: 1

March 23rd, 2010, 7:41 PM   #6  
CF Beginner
p0128 code

replaced thermo and added coolant still have ck eng light

Search this Thread
Related Topics