![]() We found a couple of Chrysler technical service bulletins for several Jeep and Dodge models that recommend reprogramming the PCM (engine computer) if the code P0128 is diagnosed.Īnother Chrysler TSB for 2009-2010 Dodge Challenger and 2008-2010 Dodge Magnum/Charger and Chrysler 300 describes a problem where the thermostat may move out of place, allowing coolant to pass through and set the code P0128. Recommends replacing the thermostat and gasket if the code P0128 is present and all other possible causes have been ruled out. Subaru service bulletin 09-56-13 for several 2013-2014 models, including the Legacy, Forester and Impreza, The solution is to reprogram the PCM with an updated software and in some Mazda 3s built prior to 2004 also replace the thermostat with an updated part. In some earlier Mazda 3 and Mazda 5 model year vehicles, the code P0128 may be caused by improper calibration of the PCM (engine computer) according to the Mazda service bulletin. The Nissan Technical Service Bulletin (TSB) for the 2007 Nissan Altima and Sentra dated April, 2009 mentions checking the part number of the engine computer with the scan tool and reprogramming it if the part number matches one of the numbers listed in the bulletin. The GM TSB dated 2007 recommends reprogramming the PCM as a solution for the code P0128 in 2006 Chevrolet Malibu, Impala, Pontiac G6, and a few other models. Replacing the thermostat often solves the In some GM cars when the code P0128 is set, the temperature gauge stops working and the radiator fans run constantly. In many GM cars and trucks (Chevrolet Trailblazer, Silverado, HHR and other models) the code P0128 is often caused by a sticking thermostat. See common problems below.Ĭommon problems causing the code P0128 in different cars: This can be done at your local dealer and costs from $80 to $120 if out of warranty. In some cars, the problem could be solved by reprogramming the engine computer (PCM) with an updated software. In most cases, whenever the code P0128 is present, the thermostat is replaced. Testing the thermostat is difficult, as it may work most of the time, but sticks intermittently. Read more: Engine coolant temperature sensor: how it works, symptoms, problems, testing. The resistance across the sensor terminals should change with the temperature according to the chart that you can find in a factory service manual. Without a scan tool, the engine temperature sensor can be tested with an ohmmeter. We would still recommend having the vehicle checked out. In general, this is not a huge problem, although it might affect the gas mileage. If the vehicle runs well, the coolant level is OK, there is enough heat and no other driveability problems, it's possible that the thermostat is sticking intermittently. Air conditioner and (or) temperature gauge stops working and (or) after the Check Engine light comes on (GM). Engine temperature drops when driving on the highway, especially in cold weather Engine takes too long to warm up in cold weather With the code P0128 there could be no symptoms at all, or any of the following: Often this code causes the Check Engine light to come on and off in cold temperatures. Steps to diagnoseīelow Thermostat Regulating Temperature means that the engine does not reach expected temperature after running for sufficient time, or in other words, it takes too long to warm up.
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