Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
HelloCustomeryes the most likely cause of the trouble code you described is the thermostat held open I have seen many of these come through my shop. Code P0128 thermostat under normal regulating temperature. Stating that the thermostat is stuck open not allowing the engine to reach operating temperature, I would recommend replacing the thermostat. What engine size does your vehicle have. I would be glad to get you the repair instructions and diagrams if completing the repair yourself.
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You will have to remove the Exhaust crossover pipe to access the thermostat. If repairing yourself be sure to soak the exhaust nuts/bolts with penetrating lubricant prior to removal- WD/40 or equivalent.
I am concerned because I thought this issue was closed. I accepted, provided feedback and paid a bonus for such good service. I just asked another question in a different catagory about a camera issue and when I looked at "My Questions" it shows this as still awaiting acceptance? Did I do something wrong or is there a glitch in the system. I would hope after such prompt and accurate service by Chris that he got paid?
Thank you for updating either me on what I needed to do or your system so it shows answer as finished and accepted.