Got A CEL ... need help - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-27-2010
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Got A CEL ... need help

so I got a CEL the other day.

code is P0128

says coolant temp below thermostat regulating temp

any ideas as to what the cause of this is? thermostat or the gauge reading wrong what could it be?
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Old 02-27-2010
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Most likely the thermostat. It could be stuck to where the temperature on the gauge doesn't change, but it can still effect everything else. Swap it out, and you should be A-OK.
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