Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sonoma, 2002 GMC Safari, 2002 GMC Jimmy, 2002 Chevrolet S10 Pickup, and 2002 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- A DTC P0128 is designed to detect a faulty thermostat.
- A skewed ECT sensor may cause a P0128 to set.
- A skewed IAT sensor may cause this DTC to set.