For Shop Owners

P0128 MITSUBISHI - Coolant Thermostat Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3 What does this mean?
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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 cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
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 MITSUBISHI Description

Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
OBDII Code P0128 Mitsubishi - Coolant Thermostat Malfunction -

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P0128 MITSUBISHI Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0128 Mitsubishi code? Have you replaced any parts?
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 06-14-2015

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