P2181 Code – Meaning, Causes, Symptoms (& How To Fix)

It can be difficult and confusing to diagnose engine problems in your vehicle, particularly if the code P2181 is visible during your scan. How can this code be fixed quickly?

Here's a close look at P2181. This guide will explain what the P2181 trouble code means and what parts may be causing it. We also provide some solutions. 

Definition of Code P2181

P2181 – Cooling System Performance

What does the P2181 code mean?

The P2181 diagnostic trouble code (DTC) isn’t common, with many manufacturers not listing it at all. It’s most prevalent with Chrysler models, showing that there’s an issue with the cooling system performance. Sadly, there’s no specific part that is highlighted with this fault.

When the radiator coolant temperature is too high or too low, P2181 will be set in the computer. If the temperature exceeds normal limits, the Powertrain Controller Module (PCM), will detect it and set an alert. 

Trouble Code P2181 Symptoms

The cause of your cooling system problem could lead to a range of symptoms. Either way, you’re likely to see some strange readings of the engine temperature gauge and the warning light may also come on. 

Below is a list of possible symptoms.

What is the P2181 code?

The cause of P2181 trouble codes will depend on which vehicle you have. The possible causes of the P2181 trouble code are numerous. This is why it is important to have a thorough diagnostic examination to identify the root cause. 

These are some possible reasons:

Is the P2181 code serious?

Medium – If the engine is running cold because of the fault, there isn’t as much danger involved. The cold engine isn’t going to impact the health of the engine as much as it does the fuel economy. You will spend less to maintain the vehicle.

On the other hand, it’s hazardous to run the engine hot. The engine can overheat and cause irreparable damage to its pistons, cylinders, and other components. These damage are irreparable. This could lead to the need for an engine replacement. 

How can you fix the P2181 code?

After you perform the diagnosis, you will be able to figure out what’s going wrong with the cooling system. Sometimes, these fixes might provide the solution you're looking for.

Below are top solutions for the P2181 code trouble code.

• Coolant top off
• Thermostat Replacement
• ECT signal circuit repair
• Engine coolant temperature (ECT) sensor replacement
• Replacement water pump
• Replacement of cooling fans
• Programming/replacement of PCM

Common mistakes in diagnosing P2181

There are multiple steps you must take to determine what’s wrong when the P2181 trouble code shows up. To diagnose the problem, you can use our steps to do it like a professional technician.

Many novice mechanics will open the radiator caps while the engine is running, or when it's hot. If you do this, serious injury can occur, so it’s very important you wait until the engine is completely cooled off before taking the cap off. 

How to diagnose P2181 Trouble code

It is important to resolve the P2181 problem code quickly to avoid further damage. However, you don’t want to simply throw parts at the system and hope they work. Instead, you need to perform a series of diagnostic steps to determine what’s wrong.

These are the steps professional mechanics use.

1. You should check all trouble codes. Multiple codes may be displayed, which can help you find the correct direction.
2. Clear any codes that are not required. You can test drive your car until you see the Check Engine Light come back on. For the latest codes, scan the system again.
3. The thermostat can be replaced if your engine gets cold.
4. Radiator fan problems could cause temperature increases when your car is parked or idling.
5. You have many other things that can go wrong when your engine heats up. Check that there is enough coolant in your system. You should not open the radiator cap when the engine is running. Add more coolant if the levels are too low.

For detailed instructions on how to test the multiple cooling system parts, you want to reference the car’s service manual. You will find detailed illustrations and instructions in the service manual. 

READ MORE FOR DIAGNOSIS: 9 Causes of an Overheating Car Engine (& How To Fix)

The estimated repair cost of P2181

There will be different repair costs depending on what is going wrong. Below are some estimators that include parts as well as labor. 

• Top off coolant – $10-$45
• Thermostat replacement – $150-$300
• ECT signal circuit repair – $100-$400
• Engine coolant temperature (ECT) sensor replacement – $150-$300
• Water pump replacement – $400-$700
• Cooling fan replacement – $450-$650
• Reprogram/replace PCM – $50-$2,000

The P2181 Code: Mechanics Tips

With the P2181 trouble code, you might see a couple of other DTCs, both of which can help you determine what’s wrong. These are some of the most common:

These codes can be used in combination with symptoms to help you diagnose issues quicker.