DTC Detection Logic
Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long enough.
This is due to a leak in the seal or the thermostat being stuck open.
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
| DTC | CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition | |
| P0128 | THERMSTAT FNCTN [Coolant thermostat (coolant temperature below thermostat regulating temperature)] |
Diagnosis condition | - |
| Signal (terminal) | - | ||
| Threshold | The engine coolant temperature does not reach to specified temperature even though the engine has run long enough | ||
| Diagnosis delay time | - | ||