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Air & Fuel Mixture ControlOBD2 Codes

P0128 – Meaning, Causes, Symptoms, & Fixes

Lawmaking P0128 Definition

Coolant thermostat temperature below regulating temperature

What Does Lawmaking P0128 Hateful?

The engine control module (ECM) tracks how long it takes for the engine of a vehicle to achieve and maintain the right operating temperature. When the correct engine operating temperature is reached, the powertrain command module orders the fuel organisation to enter a "airtight-loop" where readings from the oxygen sensors are used to maintain the efficient air to fuel ratio of 14.7:one. Most ECMs mandate that the engine coolant temperature sensor tape temperatures in a higher place 160º F within 15 minutes of the engine starting. Additionally, one time the 160º F threshold is accomplished, the recorded engine temperature must not fall below 160º F during operation. The PCM volition record if either of these two criteria is not met. If either fault is recorded again on the next engine startup, code P0128 is triggered.

What Are The Symptoms Of P0128?

• Check Engine Calorie-free is on
• Higher than normal idle
• Decreased fuel economy
• The temperature approximate is unusually low

What Is The Cause Of Code P0128?

• Stuck open up thermostat (virtually mutual)
• Missing Thermostat
• Faulty coolant temperature sensor
• Faulty wiring for coolant temperature circuit

How Serious Is Code P0128? – Low

A stuck open thermostat is most probable the trouble; however, thermostats are usually designed so that when they fail they are stuck open allowing full menstruation of the coolant protecting your engine. Check your coolant level first to make sure it is full before continuing to operate the vehicle. Overheating your engine will effect in engine failure

Code P0128 Common Diagnosis Mistakes

Many merely replace the thermostat without checking all possible causes. Check the status of the cooling system for rust deposits or a mixture of different coolants. Make certain to affluent the engine cake and radiator when replacing the thermostat to prevent deposits from getting stuck in the new thermostat.

Tools Needed to Diagnose:

• FIXD
• Basic socket and ratchet prepare
• Multimeter
• Funnel

How To Diagnose And Repair Lawmaking P0128?

Difficulty of Diagnosis and Repair (1 out of 5)

1. Browse your vehicle to verify P0128 is the simply lawmaking nowadays. If other codes are present, they must be addressed first.
2. Check the coolant level and condition. If there is excessive rust and poor coolant condition, this can clog up the cooling arrangement or cause the thermostat to stick. If your coolant condition is poor, flush the coolant system and replace the coolant. If the coolant level is low, fill the coolant organization and bank check for leaks.
3. The coolant temperature sensor can be checked with a multimeter. The ohm reading will change with the temperature. If the ohm reading is non changing with the temperature, replace the coolant temperature sensor or repair the wiring for the sensor if information technology is damaged.
4. The most common crusade for P0128 is the engine coolant thermostat is stuck open. A simple way to diagnose this is to feel the radiator hose and monitor how hot the temperature of the coolant is when it starts flowing through the radiator hose. Yet, you should exist extremely careful when doing this as yous could be burned. The hose should exist barely warm until the thermostat opens. When the thermostat does open, the hot coolant should start to menstruum and speedily warm up the radiator hose. If the radiator hose heats up slowly, the thermostat is stuck open or opening prematurely and needs to be replaced.

• Replace thermostat forth with new gaskets and coolant
• Bleed air out of coolant system
• Test drive and monitor coolant temperature
• Check for leaks

Estimated Toll of Repair

For fault code P0128, one or more than of the below repairs may exist needed to solve the underlying consequence. For each possible repair, the estimated price of repair includes the toll of the relevant parts and the price of labor required to make the repair.

• Thermostat $220-$250
• Coolant temperature sensor $140-$190

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Source: https://www.fixdapp.com/blog/p0128-code/