Engine-Codes - Nissan - P0128 2012 Nissan Altima Sedan

P0128 2012 Nissan Altima Sedan Code - Thermostat Function

- Code Popularity: 6,556 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents

|What are the Possible Causes of the Code P0128 2012 Nissan Altima Sedan?

  • 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

|How to Fix the P0128 2012 Nissan Altima Sedan Code?

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.

|Code P0128 2012 Nissan Altima Sedan Tech Notes

If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.

|What is the Cost to Diagnose the Code P0128 2012 Nissan Altima Sedan?

Labor: 1.0

The cost to diagnose the P0128 2012 Nissan Altima Sedan 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.

Does your car have Safety Recalls? → Check here

|When is the P0128 2012 Nissan Altima Sedan Code Detected?

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

|What are Code P0128 2012 Nissan Altima Sedan Possible Symptoms?

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

|What Does the P0128 2012 Nissan Altima Sedan Code Mean?

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.

Thermostat Function

|Need more Information on the P0128 2012 Nissan Altima Sedan Code?

Need more information on how to fix the P0128 2012 Nissan Altima Sedan code? Get Access to Factory Service Manuals

|Need Help with the P0128 2012 Nissan Altima Sedan Code?

Get the P0128 2012 Nissan Altima Sedan code diagnosed by a professional: Find a repair shop in your area