PO128 code override? - Ford Truck Enthusiasts Forums

6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

PO128 code override?

Old 01-06-2019, 08:39 PM
quadrider234 is offline
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PO128 code override?

I recently just installed the Mishmoto aluminum radiator and low-temp thermostats in my 2008 F-250. Every so often my truck with get a check engine light with the code “PO128” which has something to do with the coolant temp being too low. My coolant temp runs around 170 degrees or so. Is there a way to over ride this code? Or would my only solution be to re-install my stock thermostats?
Old 01-06-2019, 11:11 PM
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The code means the engine has not reached the expected warm up temp.

so if you have a thermostat that opens early....the pcm will cede this as a engine warm up problem.

youcantchange this on a 6.4 thru programming.

i would install the correct thermost


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