Error code PO128 has appeared on several scans from my handheld and confirmed by the dealership. Indicates Coolant Thermostat below temperature.It was once replaced by the dealer 1.5 years ago and the same msg re-appeared recently and as the dealership was too busy I sure non-dealership mechanic to replace it again. The engine light disappeared for awhile( 2 weeks) and has since returned. I returned it to the dealership and they told me that it could possibly be the PCM, but they couldn't guarantee it would fix the problem even after they updated the software. On top of the that no OEM part available. I wasn't willing to pay close to another $1000 for a maybe fix? Anyone else have this problem?