It will cost you anywhere between $400 to $800 to fix this issue. You’ll be spending close to $75 to $100 for labor and up t0 $600 to change the damaged components.
Table of Contents
Is it OK to drive with P0128?
You may drive your vehicle with a P0128 trouble code. You will not notice any issue except for maybe the temperature gauge never reaching normal levels, and possibly the Check Engine light being illuminated.
What causes a P0128 code?
Causes of a P0128 code include: A bad coolant temperature sensor. The cooling fan is stuck on. A bad intake air temperature sensor. A thermostat that’s malfunctioning or stuck open (electronically controlled or traditional)
Can low coolant cause a P0128 code?
Low engine coolant can alter the engine running temperature enough to signal trouble code P0128. Your intake air temperature sensor, coolant temperature sensor and coolant fan could also signal this trouble code, so these should be inspected after you look over your thermostat and coolant level.
How serious is P0128 code?
Code P0128 stands for Engine Coolant Temperature Below Thermostat Regulating Temperature. It means that the ECM/PCM has “noticed” that the engine coolant temperature is consistently running below thermostat regulating temperature. In other words, the engine is running cooler than it should.
How do I fix code P0128?
- Replacing the thermostat (most common repair)
- Replacing the coolant temperature sensor, or the wiring and connector associated with the sensor being damaged.
How do you fix low coolant temp?
The easiest way how to fix low coolant is to begin filling your coolant back to acceptable levels and allow the coolant to soak back into the system. Upon opening your radiator cap, you will see indicators such as “max” and “min” which indicates the level of the coolant mixture currently in your tank.
Can a P0128 cause rough idle?
A problem with the ECT or its circuit can set a code P0128 and could also cause the drivability problems you are experiencing. However, there are dozens of other possible causes for your symptoms.
How do I know if my thermostat is stuck open?
A thermostat stuck in the open position constantly pushes coolant into the engine and causes a lower operating temperature. Your temperature gauge will show a needle that barely increases or remains at the lowest setting.
How do you know if your IAT sensor is bad?
INTAKE-AIR TEMPERATURE SENSOR FAULTY: SYMPTOMS Fault code is stored, engine indicator lamp may come on. Problems starting. Reduced engine power. Increased fuel consumption.
What happens if engine runs too cold?
If you run your engine cold all the time, you’ll most likely experience increased fuel consumption across the board. Additionally, you’ll find higher amounts of carbon buildup at various parts of the engine. The most damaging effect of feeding a fuel-rich mixture to the engine is excess fuel reaching the exhaust.
Will a stuck thermostat throw a code?
the most noticeable issues occur when the thermostat gets stuck in either the open or closed position. a malfunction can result in a trouble code, generated by the engine’s computer, which can turn on your check engine light.
Where is the coolant temperature sensor located?
Where is the Coolant Temperature Sensor located? The coolant temperature sensor will be located directly behind the coolant pipe. In most modern cars and vehicles, this is present behind the right cylinder head that is located right underneath the air intake pipe.
Where is the temperature sensor located?
It is often located behind the front bumper, but on some vehicles can be found in the door mirror behind the glass. It is used to estimate air density and by the air conditioning system โ the system will not function if the air outside is too cold.
How much does it cost to replace car thermostat?
So fixing a car thermostat will usually cost somewhere in the range of $200 to $300. But you’ll need to speak with your mechanic to get a more exact estimate. More than labor costs, the price will depend on your car. While a Honda Accord Thermostat will cost around $150, a Jaguar XJ thermostat could cost up to $500.
How do you test a coolant temperature sensor?
Gently lower the end of the sensor into the water until the entire device is fully submerged. Wait a minute or so for the screen to give you a reading of the cold water. Once you have a reading, write down the measurement for reference. A common reading for a temperature sensor in cold water is around 5 volts.
Can a bad coolant temp sensor cause overheating?
If the coolant temperature sensor malfunctions, it could cause your car engine to get overheated. While sometimes a faulty sensor sends a permanent cold signal to the engine, it can also send a permanent hot signal.
How do you reset the temperature gauge on a car?

How much does it cost to replace a thermostat housing?
How Much Does a Thermostat Housing Replacement Cost? A replacement thermostat housing will cost you around $50 to $250 on parts alone. Labor costs can range anywhere between $130 and $170. Keep in mind that you may need to spend more on other related repairs.
Can low coolant cause a check engine light?
Yes most cars will have a warning light for the coolant level. This would not normally trigger the check engine light at the same time unless it is so low that some other fault has been triggered.
How long does it take to replace a thermostat in a car?
How long does a car thermostat replacement take? An average thermostat replacement takes around 1 hour, with some taking as little as 30 minutes. More problematic replacements can take a little longer where there are issues accessing an awkwardly positioned part or if it’s become seriously stuck in place.
Is there a fuse for coolant temperature sensor?
There isn’t one per se. There will be a fused wire with voltage to the instrument cluster (your owners manual should indicate which fuse), but the temperature sensor is providing a variable “resistance to ground,” which the temperature gauge in the dash is reflecting.
Why does my BMW keep saying low coolant?
Reasons Why Your Coolant Might Be Low leak in radiator. leak in radiator hoses. leak in water pump. damaged or broken radiator seal.
How do you reset the coolant light on a BMW?

What should coolant temp?
Normal coolant temperature will be around 195 to 220 Fahrenheit (approx 90ยฐC) and anything above or below this can start causing problems.