DTC P0128 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature): Description
WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
HINT:
This DTC relates to the thermostat.
This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time having elapsed.
DTC DETECTION CONDITIONS CHART
| DTC No. | DTC Detection Conditions | Trouble Areas |
|---|---|---|
| P0128 | Conditions (a), (b) and (c) met for 5 seconds (2 trip detection logic):
|
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