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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
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Old 03-13-2010, 08:53 PM
CF Beginner
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.
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Last edited by jcolpaert; 03-13-2010 at 09:52 PM. Reason: Adding truck information
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Old 03-13-2010, 08:55 PM
CF Junior Member
Join Date: Jan 2010
Posts: 85

year make model of truck
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Old 03-13-2010, 09:04 PM
maxxman04's Avatar
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1990 Chevrolet Camaro
Join Date: Dec 2009
Location: kentucky
Posts: 1,854

yeah, we're gonna need the vehicle specifics. typically tho, there is a sending unit for the gauge, and another sensor for the ecm.
rednekper4mince. keepin duct tape and bailing wire in business.
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Old 03-13-2010, 09:43 PM
MDTAHOE's Avatar
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Professional Mechanic
Join Date: Nov 2008
Location: Bowie, MD
Posts: 2,955

Replace the t-stat. 99% of the time it takes care of the problem.
ASE Master Tech, L1 Advance Engine Performance certified
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I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.
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Old 03-23-2010, 12:10 PM
CF Beginner
Join Date: Mar 2010
Posts: 2

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

replaced thermo and added coolant still have ck eng light
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Old 03-23-2010, 07:41 PM

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

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