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.
There is a factory service bulletin for all Nissan Models 2002 and Up, with the P0128 and remote starter system. Bulletin information:
IF CONFIRM
The MIL is “ON” with P0128 (Thermostat Function) stored.
ACTIONS
1. Check to see if an aftermarket remote starter system is installed. Remote starter systems may cause the MIL to illuminate and DTC P0128 to store.
2. If a remote starter system is installed, remove/disconnect it before performing diagnostic procedures on the vehicle.
To diagnose the P0128 Nissan 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 engine coolant temperature does not reach to specified temperature even though the engine has run long enough.
The thermostat is a component that blocks the flow of coolant to the radiator until the engine has warmed up. When the engine is cold, no coolant flows through the engine. Once the engine reaches its operating temperature, the thermostat opens. The OBDII sets when the 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 open stuck.
Need more information on how to fix the P0128 Nissan code? Get Access to Factory Service Manuals
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