Chevy Duramax P01F0 Engine Code

What does the Chevy P01F0 code mean?

The P01F0 code will pop up when your coolant temperature has dropped below the standard diagnostic monitoring temperature. This code is telling you your coolant temp is low – but that could be a symptom of a bigger issue.

You will usually trigger a P01F0 code when your coolant temperature is lower than it should be.

In most cases, that’s not because you have little coolant but due to a faulty thermostat.

Fortunately, both scenarios are easy to fix – and I’ll explain how to do it at the bottom of the article.

Chevy Duramax Code P01F0

Symptoms of code P01F0

  • Coolant temperature has dropped below diagnostic monitoring temperature

Causes of code P01F0

  • Low coolant temperature
  • Faulty sensors
  • Stuck thermostat

Fixes for P01F0

  • Adding more coolant to your car
  • Replacing the thermostat

Is having low coolant temperature bad?

Having a low coolant temp is never a good thing. Your car depends on coolant to work properly; without it, temperatures will begin to rise to unhealthy levels, which could wreak havoc inside your engine.

Paying attention to your coolant temperature is a must.

When you realize it’s dropping below the average numbers (or going the opposite way as well), you need to figure out what went wrong and fix it.

Why is my coolant temperature low?

Your car uses coolant to regulate its temperature and prevent your engine from overheating. From time to time, you will have to supply your car with more coolant; otherwise, your coolant temperature will run low.

Low coolant temperature is nothing to be afraid of! You can easily fix this issue with a trip to the store.

That is, as long as the low coolant temp is not a symptom of something else.

Unfortunately, sometimes cars will let you believe something minor is going on when, in fact, there’s a bigger issue at hand.

I’ll talk a little bit more about that down below.

How do you fix low coolant temp?

There are two possible scenarios when you have low coolant temperature: the first is a lack of coolant, which you can fix by adding more; the second one is a faulty car thermostat, which you can fix by replacing it.

The easiest way to figure out whether you need to buy coolant or a thermostat is to assume you’re in the first scenario.

Pour more coolant in your car and wait to see what happens.

If you continue to have the same problem, you don’t have a coolant issue – you have a thermostat problem.

How do I check my car thermostat?

It’s easy to check your thermostat. Make sure the engine and radiator are cool before you begin. Then, pop the hood, find the radiator hose, and follow its way to the engine – that’s where the thermostat is. After that, you’ll have to check if the coolant is flowing or not.

Once you find the thermostat, you need to let your car idle for a bit. After the temperatures start to rise, a working thermostat would allow the coolant to flow.

If you find the thermostat allowing the coolant to flow right away, you have a problem. That’s a dead giveaway that your thermostat is stuck open – and you need to fix it.

Why is my car thermostat stuck open?

Most thermostats open up and get stuck after they fail and need to be replaced. Some of them do this by design to let you know something has gone wrong. Other models simply stop working in the open position and stay there.

The reason why your thermostat opened and remained stuck is rather unimportant. It could be for a variety of reasons: wearing out, clogging, an overheated engine, and all sorts of issues.

By the time you realize the thermostat went bad, you’re past trying to find out what went wrong – because there’s a bigger issue that you need to fix.

The important thing you need to understand is that once your thermostat is stuck open, you’ll need to replace it.

Is it okay to drive with an open thermostat?

Driving with an open or stuck thermostat is a recipe for failure. You will waste fuel like no other and endanger your engine as you do so. In this scenario, the best thing you can do is replace the thermostat as soon as possible.

A stuck thermostat won’t allow your vehicle to read its temperatures properly.

When that happens, you will be permanently stuck in the warm up period – and that’s where your car burns the most fuel.

Since your car is forever stuck trying to warm up (even though it’s way past that stage after a few minutes), you will be constantly using fuel.

In that scenario, the fumes and excess fuel could make their way to other parts of your engine (where they don’t belong).

There are a few car parts that could break in this scenario; the one that’ll hurt you the most is the catalytic converter. This little car part is in charge of preventing pollution from making its way from your car to the atmosphere.

In most places, you can’t drive without catalytic converter – and not having one could lead to a hefty fine.

How do I get my car thermostat unstuck?

The only way to fix your car is to replace your thermostat. You should drive to a repair shop and get someone to do it for you. It’ll cost as little as $100 or as much as $500.

You can replace the thermostat yourself if you like to get your hands dirty. In fact, thermostats cost somewhere between $12 and $200.

Yes, that’s right. You’ll be paying more for labor costs than the thermostat itself.

And changing the thermostat is not that hard!

All you have to do is remove the thermostat, clean things up, add the new thermostat, pour a little coolant to level things, and call it a day.

It’s important to note that the hardest part of doing this is finding a thermostat with the right size for your car. If you’re unable to do so, it’d be better to visit a repair shop.

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