2005 Chevrolet Trailblazer Q&A

2005 Chevrolet Trailblazer Question: Code PO128

I replaced the coolant temp sensor. I am still getting a PO128 code. I tested the sensor and it tests good. The gauge reads 200. What else could be causing the code? -
Answer 1
Did you replace the thermostat as suggested before? You say temp. reads 200 but is it constant while driving down the road? Unless you have a REAL scanner a DVOM and the savvy to use them, get a mechanic to have a look. Circuit or ecm problem, will have to be tested. -
Comment 1
I have same problem. Always get same code. Now have intermittent starting problems and no mechanic around can seem to find the problem. -
Related Items:
PO141, PO304, PO128, PO014, PO016
both Eng heat Gage with compressor of the air condition stop working and returned to work with out doing anything, the led and the needle are working but not the compressor and the meter i think th...
I have a check engine light staying on. The code is PO128, with listed probable cause being 1. coolant level 2. Thermostat defective, or 3. Engine coolant temperature sensor defective. The coolant...
i have 5 coads.. po0114, po016, po106, po410 and po128.. would any of these cause it??