How To Fix Honda P0128 Code thermostat coolant temperature below thermostat regulating temperature
Whyingo · 82K views · 3:22
Skill Level
IntermediateTime Required
Half dayEstimated Cost
$50–200Equipment
Honda 2016-2021 Civic 10th GenPermit Required
NoTools Needed
Socket set, Wrench set, Screwdrivers, Coolant drain pan, Thermometer, OBD2 scannerDefinition meaning and fixes for a Honda P0128 engine Diagnostic Trouble Code: Coolant thermostat – coolant temperature below the thermostat regulating temperature. Cooling System Malfunction
Causes of a Honda P0128 DTC:
Low Coolant
Air in Coolant System
Bad Thermostat
Faulty Coolant Temperature Sensor
Coolant Temperature Sensor Wiring
Needs Software Update