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

Go Back   > >
Log In 

Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-13-2010, 08:53 PM
CF Beginner
Thread Starter
 
Join Date: Mar 2010
Posts: 2
Default 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; 03-13-2010 at 09:52 PM. Reason: Adding truck information
Reply With Quote
  #2  
Old 03-13-2010, 08:55 PM
CF Junior Member
 
Join Date: Jan 2010
Posts: 85
Default

year make model of truck
Reply With Quote
  #3  
Old 03-13-2010, 09:04 PM
maxxman04's Avatar
CF Veteran
 
Join Date: Dec 2009
Location: kentucky
Posts: 1,854
Default

yeah, we're gonna need the vehicle specifics. typically tho, there is a sending unit for the gauge, and another sensor for the ecm.
Reply With Quote
  #4  
Old 03-13-2010, 09:43 PM
MDTAHOE's Avatar
Super Moderator
Professional Mechanic
 
Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,955
Default

Replace the t-stat. 99% of the time it takes care of the problem.
Reply With Quote
  #5  
Old 03-23-2010, 12:10 PM
CF Beginner
Thread Starter
 
Join Date: Mar 2010
Posts: 2
Default

Thanks. Thermonstat replaced and problem solved. Suspect old thermostat was opening too soon. Thanks again!
Reply With Quote
  #6  
Old 03-23-2010, 07:41 PM
per per is offline
CF Beginner
 
Join Date: Mar 2010
Posts: 1
Default p0128 code

replaced thermo and added coolant still have ck eng light
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Trouble getting OBD Code Mehthiro Silverado & Fullsize Pick-ups 0 03-03-2014 11:48 AM
Stalling and OBD trouble. 93 Lumina 3.1 lovesmonica Beretta, Corsica, & pre-1995 Lumina 0 03-22-2011 08:02 PM
Service Engine Light--PO128 Christie08 TrailBlazer 2 07-06-2009 03:38 PM
P1482 OBD-II trouble code rsaz TrailBlazer 1 09-06-2008 08:58 AM
obd code 0420 kil0 Impala 1 06-04-2007 09:11 PM


Tags
128, 1500, 2004, 2006, 43v6, chevy, code, codes, dtc, gm, ii, malibu, obd, p1028, po, po128, trailblazer, trouble

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 12:22 PM.