For Shop Owners

P0128 CHRYSLER - Thermostat Rationality

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 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?

Coolant temperature does not reach predicted engine coolant temperature within specific time

Possible symptoms

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

P0128 CHRYSLER 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 Chrysler - Thermostat Rationality -

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P0128 CHRYSLER 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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