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P0128 trouble code - Cars & Trucks

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Code 128 is for the engine coolant not reaching normal operating temp. The most common cause is a faulty thermostat.

Posted on Jul 16, 2013

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Posted on Jan 02, 2017

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What is the normal ghead or coolant operating temp tha world report on a Scanguage


the thermostat opoens at 195 degrees Farenheit, so any range from 175-200

also, if your thermostat fails in the open position, you'll set a P0128 OBD-II Trouble Code

Read more at: http://www.obd-codes.com/p0128
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Apr 08, 2015 | 2005 Ford Escape Hybrid

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Code p0128 chevy 2500hd 6.0


Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature

Does the water temp gauge in the dash work? I'd be willing to bet it doesn't. Turn ignition on, check for voltage at water temp sensor harness. If voltage is present, replace water temp sensor. Check the air temp sensor also. If there's no voltage, find out why. Maybe both sensors are on the same harness on this truck and it has become disconnected somehow?
Wish i could offer more specifics but i don't have a wiring diagram handy. Good luck.

Apr 05, 2013 | Cars & Trucks

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2004 trailblazer code po128


P0128:
P0128 OBD-II Trouble Code
Technical DescriptionCoolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

What does that mean?This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

CausesA code P0128 may mean that one or more of the following has happened:

Low engine coolant level .
Leaking or stuck open thermostat .
Faulty cooling fan (running too much) .
Faulty coolant temperature (ECT) sensor.
Faulty intake air temperature (IAT) sensor .Here's a link on replacing your thermostat.

Feb 06, 2013 | 2004 Chevrolet TrailBlazer

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Error code P0128


Trouble Code: P0128

Thermostat Range/Performance

Trouble Code Conditions: DTC P0107, P0108, P0112, P0113, P0116-118, P0335, P0336, P0300-P0306, P0401, P0505, P1106-P1108, P1259 and P1519, engine running at road load for 10 minutes, and the PCM detected the ECT sensor input did not reach the correct closed loop value. Note: It is possible for this code to set if the engine is left running while the hood is open for an extended period in a warm climate.

Possible Causes:


Inspect for low coolant level or for an incorrect coolant mixtureCheck the operation of the thermostat (it may be stuck open)TSB 01-064 (9/11/01) contains a repair procedure for this code

Jan 27, 2013 | 2001 Honda Civic 1.7

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Vw jetta code p0128


this obd2 trouble code table can help you understand the meaning of code.
and for p0128, you can try:

Verify coolant strength & level

Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.

Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.

Verify proper intake air temperature (IAT) sensor operation, replace if necessary.

If the above items check out good, replace the thermostat

Aug 13, 2011 | Volkswagen Jetta Cars & Trucks

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What do codes P0128, P0133, P0496


Definition of Diagnostic Trouble Code P0128 Category Powertrain Definition Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Definition of Diagnostic Trouble Code P0133 Category Powertrain Definition O2 Sensor Circuit Slow Response Bank 1 Sensor 1

Definition of Diagnostic Trouble Code P0496 Category Powertrain Definition Evaporative Emission System High Purge Flow

Mar 10, 2010 | 2006 Suzuki Forenza

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My engine light is on and the faulty code is P0128, what is this mean?


Trouble Code: P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Possible Causes:


Insufficient warm up time Low engine coolant level Leaking or stuck open thermostat Inoperative engine coolant temperature (ECT) sensor Inoperative Cylinder Head Temperature (CHT) sensor

Dec 04, 2009 | 2004 Ford Focus

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