For Shop Owners

P0128 NISSAN - Thermostat Function

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Leaking or stuck open thermostat
  • Low engine coolant level
  • Insufficient warm up time
  • Faulty engine coolant temperature sensor
  • Engine coolant temperature sensor harness is open or shorted
  • Engine coolant temperature sensor circuit poor electrical connection
What does this mean?

Tech notes

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:

The MIL is “ON” with P0128 (Thermostat Function) stored.
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.

What does this mean?

When is the code detected?

The engine coolant temperature does not reach to specified temperature even though the engine has run long enough.

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0128 NISSAN Description

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.
OBDII Code P0128 Nissan - Thermostat Function -

P0128 NISSAN Information for specific Nissan models

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P0128 NISSAN Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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Posted and Edit by 02-20-2017

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