scottb ... 11/18/2012

2005 Dodge Ram 1500 Laramie 8Cyl5.7L - Engine

Follow

I have a check engine light - it is showing code P0128 - my truck has never overheated or lost coolant.

Answer This Question

Follow Question what's this?

( characters left)

Add Answer Community Guidelines

answers

• 
  Jimm 11/19/2012

  P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). P0128 indicates the engine has not achieved the optimum temperature within the specified amount of time.
  
  Possible Causes:
  
  Low coolant level
  Stuck open thermostat
  Defective engine coolant temperature (ECT) sensor
  Defective intake air temperature (IAT) sensor
  Defective cooling fan
  Defective cooling fan relay
  
  Possible Solutions:
  
  Top off coolant
  Replace thermostat
  Replace engine coolant temperature (ECT) sensor
  Replace Intake air temperature (IAT) sensor
  Replace cooling fan
  Replace cooling fan relay

  Reply

  0