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BDTC P0128

Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature

" I have seen this several times this week alone. All three times I replaced the coolant temp sensor and it fixed the customers problem. john f.

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Q: What is the diagonistic code po128 on a 2002 chevolet?
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What is code po128 for?

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PO128 refers to the thermostat not operating properly. You could replace the thermostat with a good quality one such as Stant. The computer will have to be cleared. If the code does come back then you need to have a repair shop check it out for you. Code PO128 is engine temperature below specs. You can try changing the thermostat and have the code cleared. If that does not work then you need to pay a shop to further diagnosis it. jd


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You are geeting a PO128 error message on 2001 Chevy Astro?

I have the same van and had the same problem. The error code PO128 is an error code letting you know you need to specifically replace the Coolant Temperature Sensor. The Sensor is about $14.00- $15.00. Just a little work, not bad. I did it and actually helped my gas mileage also. I would recommend Advanced Auto Parts.


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