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Error code p0128 on Dodge Magnum 2006 and P1004

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It is very likely your thermostat is stuck open. Replace the thermostat and it should be fine.

P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

Posted on Oct 03, 2009

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The 128 code is usually a bad thermostat. rationality check shows what the engine temp SHOULD be after x minutes of running when the thermostat works as designed. If its more than a few degrees off of expected, a code is set. Coolant temp sensors, low coolant or air buvbbles in coolant can also create a similar code in a perfect storm sort of way, but I have sene it so I thought Id mention it.

the 1004 code refers to manifold runner control. There is a TSB for that from the dealer that involved a reflash, and sometymes replacement of the upper intake assembly. Call your dealership and see if your vehicle qualifies for a free recall update due to the TSB status.

Posted on Oct 03, 2009

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