Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
If the cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
When troubleshooting a 2000-2001 Accord or 2001-2002 Civic, if the PGM Tester tells you there is a DTC P0128 (Cooling System Malfunction) or P1486 (Cooling System Malfunction) set, it's really reporting the same thing. DTC P0128 is an SAE or generic Diagnostic Trouble Code (DTC) while P1486 is a manufacturer-specific DTC. Since these DTCs are similar, the PGM Tester sometimes reports a P0128 when it detects a P1486 or vice versa.
To diagnose the P0128 Acura code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
The thermostat is closed when the engine coolant temperature is low, and it stops the circulation of engine coolant to speed up engine warm-up. When the engine coolant temperature increases, the thermostat opens and circulates the engine coolant to control its temperature. When the engine coolant temperature decreases, the opening area of the thermostat is reduced to regulate the engine coolant temperature. If the thermostat sticks open, engine warm-up is delayed, and exhaust emissions are adversely affected. The Powertrain Control Module (PCM) measures the rise in the coolant temperature after the engine starts at the engine block and at the radiator, and it estimates the characteristics of the engine coolant temperature by calculations based on those two temperatures and the driving conditions. When the Engine Coolant Temperature (ECT) Sensor 2 immediately increases from the starting value, it is defined as the thermostat stuck open. When ECT Sensor 1 does not reach a specified value at a certain condition, it is defined as a thermostat malfunction.
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