Hi,
This is a Common Error. If so that is usually a thermostat rather than an sensor. As for the fan staying on, it is either a contact in the relay in the under hood fuse block of the PCM is staying powered and causing this. I suggest you start with the relay because it is easy and not expensive.
Let me know, if needed further assistance.
Hope i helped you.
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You may need to replace the thermo relay of the engine to make the temp gauge running. it will work for sure
This problem is caused by a disconnected or a defective ECT (engine coolant temperature sensor), the sensor is located near the thermostat housing in most GM engines, the fan runs all the time because it is in default run, this is caused by a loss of signal from the ECT sensor. The best thing to do here is run a ODB 2 fault code test, this will provide the specific fault going on here, Kragen auto and Autozone do this test for free.
You replaced the ECT, that doesn't mean the signal is reaching the Powertrain control module, have it tested as i stated for a fault code to see if PCM sees the ECT signal, this is a circuit issue not necessarily a sensor issue as u have already found out.
did u just do this test for the code P0126?
Sorry P0128
this code means the ECT has sensed the engine coolant temperature is not at normal operating temp, this once again is the ECT signal loss problem, u need to hook up a break out box and make sure the ECT signal is the powertrain control computer, the dealer has this tool and the test is fairly quick to do, if the wiring harness checks out good then the computer is defective. U asked for expert help and I am giving it, if there was a magic bullet to fix this problem i would share that with u in a hot second, I am giving yu the benefit of 35 of factory training and shop experience in electronic engine control problems, u just need to follow my advise to get he problem fixed or just keep spinning your wheels.
do u read my replay on the cause of P0128?
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I have replaced the ECT sensor it seemed to not make a difference. The DIC is saying engine hot turn off A/C anyother suggestion
I got it read it was P0128
I got a 2006 Impala with engine code of P0128
what would cause that
Where is the thermo relay located and is there a way of testing it
sound great thanks
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