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scottbrad916

scottb ... 11/18/2012

2005 Dodge Ram 1500 Laramie 8 Cyl 5.7L

Engine

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

1 Answer


Jimm

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

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