Diagnostic Aids
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- DTC P0128 is designed to detect a faulty thermostat.
- Excessive coolant flow through the by-pass hose to the throttle body may cause this DTC to set.
- A skewed ECT sensor can cause a DTC P0128 to set.
- A skewed IAT sensor can cause this DTC to set.