Question about Chevrolet 1500
P0128 is a generic code to indicate that the engine isn't reaching proper temp. If it has
the Vortec 4.3 like my S-10 is (I am having a similar problem). Check the overflow
tank as the tube will come off and allow air into the system, also check the radiator
coolant level under the cap. The third item is the intake manifold gasket, check for
seepage. If all these things are good I would replace the thermostat (my S-10 had one
sticking which could actually be seen on the temp gage, it wasn't reaching the normal
195 degrees). If you have the temp gage on your dash watch for low temperature to
indicate a bad thermostat, luckily it sounds as if yours is sticking open as mine did.
Hope this helps.
Posted on Mar 26, 2011
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Posted on Jan 02, 2017
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This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125
In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
A code P0128 may mean that one or more of the following has happened:
Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
I hope this helps a bit!
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