Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
The cost to diagnose the P0128 Isuzu code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
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Get the P0128 Isuzu code diagnosed by a professional: Find a repair shop in your area