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SC 430
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Repair and Diagnosis
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Engine Performance
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Engine Control System (Diagnostic Codes (P0010-P0340)
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SFI System
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DTC P0128: Thermostat Malfunction
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Monitor Strategy
Monitor Strategy
Related DTCs
P0128: Coolant thermostat
Required Sensors/Components (Main)
Thermostat
Required Sensors/Components (Related)
ECT sensor, IAT sensor, Vehicle speed sensor
Frequency of Operation
Once per drive cycle
Duration
15 minutes
MIL Operation
2 driving cycles
Sequence of Operation
None