AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Nissan - P0128 Nissan

P0128 Nissan Code - Thermostat Function

- Code Popularity: 89,894 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P0128 Nissan?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other 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
⚠ Does your Nissan have Safety Recalls? → Check here

How to Fix the DTC P0128 Nissan?

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.

Code 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:


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.

Search for P0128 Nissan Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

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.

When is the Code Detected?

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

What are Code Possible Symptoms?

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

Code P0128 Nissan Description

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.

OBDII Code P0128 Nissan - Thermostat Function - AutoCodes.com
P0128 Nissan Code - Thermostat Function

Need More Information on the Code?

Need more information on how to fix the P0128 Nissan code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0128 Nissan code diagnosed by a professional: Find a repair shop in your area

Code P0128 Nissan comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0128 Nissan code? Have you replaced any parts?
Any information is appreciated. Thanks