P2022 code — how to fix error fast

If you are driving a diesel-powered car, the code P2022 is one of the most common OBD2 error codes you may get. It can’t be helped since there are many codes related to the gas emissions of diesel engines, but to fix the code at its code you need to know more about it.

That’s why our team has decided to give you a hint on the P2022 code meaning and potential causes that might have led to the code showing up in the first place. We’ll also discuss some of the main ways of diagnosing and fixing the code, as well as go over the means of prevention to help you steer away from the code in the future.

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What does the P2022 code mean?

The P2022 code refers to the “Reductant Tank Level Sensor Circuit Low Input” in the selective catalytic reduction (SCR) system. The SCR system is responsible for reducing the amount of nitrogen oxide (NOx) emissions released into the atmosphere.

When the car’s computer detects a low input signal from the reductant tank level sensor circuit, it triggers the P2022 code. The reductant tank is where diesel exhaust fluid (DEF) is stored, and it is essential to keep the DEF level at the correct level to ensure the SCR system operates correctly.

If the P2022 code is left unattended, it can cause damage to other parts of the vehicle or lead to costly repairs. Therefore, it is crucial to diagnose and fix the code as soon as possible.

What causes the P2022 code?

There are all sorts of different reasons behind the code P2022, but we think it’s important to know about all of them so you can properly diagnose the issue and fix the code. So, here’s what might have been causing the issue in your car:

Faulty reductant tank level sensor

The most common cause of the P2022 code is a faulty reductant tank level sensor. When the sensor fails, it sends an inaccurate signal to the car’s computer, indicating that the DEF level is low when it is not.

Symptoms of a faulty reductant tank level sensor include poor fuel economy, reduced engine performance, and difficulty starting the car.

Wiring issues

Wiring problems can also cause the P2022 code. Damaged or corroded wires can cause a low input signal from the reductant tank level sensor circuit, triggering the code.

Symptoms of wiring issues include sporadic engine performance, a check engine light, and intermittent starting problems.

Failed SCR system

The SCR system can also cause the P2022 code. If the system fails, it can cause the DEF level to drop, triggering the code.

Symptoms of a failed SCR system include poor fuel economy, reduced engine performance, and difficulty starting the car.

Which car models does the P2022 code affect the most?

While this code can affect any car model, some models are more likely to experience this issue due to their design or specific components.

Here are some car models that are most likely to be affected by the code P2022:

• BMW X5: Some BMW X5 models have been known to experience issues with the fuel rail pressure sensor, which can trigger the P2022 code.
• Mercedes-Benz C-Class: Certain Mercedes-Benz models, such as the C-Class have also been reported to have problems with the fuel rail pressure sensor and may display the P2022 code.
• Audi A4: Some Audi models like the A4 have had issues with the fuel rail pressure sensor that can lead to the P2022 code being triggered.

How to diagnose the P2022 code

Diagnosing the P2022 code requires specialized tools and equipment and should be performed by a professional mechanic. However, if you have experience working on cars, you can follow these steps to diagnose the code:

Check the DEF Level

The first step in diagnosing the P2022 code is to check the DEF level. If the level is low, refill the tank and clear the code.

Check the Wiring

If the DEF level is at the correct level, check the wiring for any damage or corrosion. Repair or replace any damaged wiring.

Check the Reductant Tank Level Sensor

If the wiring is in good condition, check the reductant tank level sensor for any damage or failure. Replace the sensor if it is faulty.

Check the SCR System

If the reductant tank level sensor is functioning correctly, check the SCR system for any issues. If the system is faulty, replace it.

How to fix the P2022 code

Fixing the P2022 code depends on the underlying cause. Here are some potential fixes for each cause:

Faulty reductant tank level sensor

If the reductant tank level sensor is faulty, replace it. The cost of a new sensor is around $$150-$$300. It’s relatively simple to replace the sensor, but we still recommend you entrust this task to a mechanic.

Wiring issues

If the wiring is damaged or corroded, repair or replace it. The cost of repairing or replacing the wiring depends on the extent of the damage.

Failed SCR system

If the SCR system is faulty, replace it. The cost of a new SCR system can range from $$500-$$1500. It’s one of the worst-case scenarios, so we recommend you always make sure that there are no other issues causing the code before you get to the SCR system replacement.

How to prevent the P2022 code

To prevent the P2022 code, it is essential to properly maintain the vehicle. Here are some preventative measures:

• Regularly check and fill the DEF tank.
• Keep the wiring and reductant tank level sensor in good condition.
• Perform routine maintenance on the SCR system, including replacing the DEF filter and checking for any leaks.

Proper maintenance can help prevent the P2022 code and ensure the vehicle operates correctly.

Our take

In the end, it all comes down to properly diagnosing the code P2022 and if you stick with this guide, you can always figure out a solution. We hope that the pieces of advice listed by our team of experts will suffice for you to aid in fixing the code and making sure it doesn’t happen again.