P0128 Infiniti Engine Coolant Temperature Below Thermostat Regulating Temperature
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
– 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
Tech description
If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
What about the obd code?
If the Powertrain Control Module (PCM) detects the calibrated amount of air flow and engine run time have been met, and the Engine Coolant Temperature (ECT) has not met the minimum thermostat regulating temperature, the code P0128 Infiniti will set.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0128 Infiniti Description
An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the Powertrain Control Module (PCM) for engine control and as an enabling criteria for some diagnosis.
The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the regulating temperature of the thermostat, the diagnostic that use ECT as enabling criteria may not run when expected.
Infiniti Vehicle:Infiniti EX35,Infiniti FX35,Infiniti FX50,Infiniti G25,Infiniti G37,Infiniti M35,Infiniti M37,Infiniti M56,Infiniti QX562013 Infiniti,2012 Infiniti,2011 Infiniti,2010 Infiniti,2009 Infiniti,2008 Infiniti,2007 Infiniti,2006 Infiniti,2005 Infiniti,2004 Infiniti,2003 Infiniti,2002 Infiniti,2001 Infiniti,2000 Infiniti,1999 Infiniti,1998 Infiniti,1997 Infiniti,1996 Infiniti,