2007 Chevrolet Silverado 2500HD Logo
Posted on Sep 25, 2009
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PO128 and PO403 trouble codes on a 2007 HD2500

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Ronny Bennett Sr.

Ronny Bennett Sr.

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  • Chevrolet Master 6,988 Answers
  • Posted on Sep 25, 2009
Ronny Bennett Sr.
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CHECK TO SEE IF THE THERMOSTAT IS STUCK OPEN(PO128)ALSO CHECK TO SEE IF A WIRE IS BURNED ON THE EGR POSISTION SENSOR,OR IS UNPLUGGED(po403)

michael schultz

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  • Master 1,068 Answers
  • Posted on Sep 25, 2009
michael schultz
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If this is the 6.0 then the first code p0128 is for a coolant temp not reaching operating temp. (bad temp sensor) now on the second one p0403 i can't find itch may mean it is a different motor or the code may have been written down wrong. please give a little more info so i can make sure.

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