What is OBD-II Code P2ADA – Reductant Tank Temperature Sensor B Circuit Range/Performance

The OBD-II (On-Board Diagnostic-II) system in your car is a computer system that monitors the performance of various components of your vehicle. When a problem is detected, the system will set an OBD-II code, which can help your mechanic identify the issue. One such code is P2ADA, which refers to the Reductant Tank Temperature Sensor B Circuit Range/Performance. In this article, we will explore what this code means, the symptoms you may experience, and how to repair the issue.

Section 1: Understanding OBD-II Code P2ADA

OBD-II code P2ADA refers to a problem with the Reductant Tank Temperature Sensor B Circuit. The Reductant Tank Temperature Sensor is an essential part of the Selective Catalytic Reduction (SCR) system utilized by many modern diesel engines, which includes your vehicle. Its purpose is to monitor the temperature of the DEF (Diesel Exhaust Fluid) tank and to ensure that the temperature remains within a specific range. When this sensor detects an issue, it triggers code P2ADA.

Section 2: Symptoms of an issue with Reductant Tank Temperature Sensor B Circuit

When the Reductant Tank Temperature Sensor B Circuit malfunctions, you may experience various symptoms. The most obvious of which is that the Check Engine Light (CEL) will light up on your dashboard. Other signs of a problem include reduced engine performance, a decrease in fuel efficiency, and harsh exhaust fumes. If you ignore these symptoms and continue to drive your vehicle, you run the risk of damaging the engine further, causing a breakdown, or even failing an emissions test.

Section 3: Diagnosing the issue with Reductant Tank Temperature Sensor B Circuit

When you bring your vehicle to a mechanic, they will first use an OBD-II scanner to evaluate the codes stored in your car’s computer system. If P2ADA shows up, they will begin checking the Reductant Tank Temperature Sensor B Circuit thoroughly. The mechanic may check the wiring connected to the sensor, inspect the sensor for damage, or perform tests to confirm that it is functioning correctly. If the sensor is faulty, it will need to be replaced.

Section 4: Repairing the issue with Reductant Tank Temperature Sensor B Circuit

Luckily, replacing the Reductant Tank Temperature Sensor B Circuit is a relatively straightforward repair. The process will involve accessing the sensor and disconnecting its wiring harness. Once the sensor is removed, a new sensor can be installed, and the wiring reconnected. After this, your mechanic will complete a test drive to ensure that the issue has been resolved efficiently.


1. Can I drive with code P2ADA?
While you can still drive with code P2ADA, it’s inadvisable, as the issue can worsen over time and may cause more significant problems in your vehicle. We recommend bringing your vehicle to a licensed mechanic as soon as possible.

2. What causes P2ADA code?
Code P2ADA is caused by a malfunction in the Reductant Tank Temperature Sensor B Circuit. This issue may occur due to normal wear and tear or from exposure to the elements during the lifetime of the vehicle.

3. Can I fix P2ADA myself?
While it may be tempting to fix P2ADA yourself, we strongly advise against it unless you are a licensed mechanic. Attempting to repair or replace a component of your vehicle without training and experience can lead to further damage to your vehicle or cause injury to yourself. We recommend contacting a licensed mechanic to have your vehicle repaired.

4. How much does it cost to repair P2ADA?
The cost of repairing P2ADA will depend on various factors, including the severity of the issue and the labor rates charged by your mechanic. In general, you can expect to pay between $250 – $500 for repairs related to P2ADA.

5. How can I prevent P2ADA from reoccurring?
To prevent P2ADA from recurring, it’s essential to keep up with your vehicle’s routine maintenance, including regular oil changes, checks of your DEF system, and other recommended services. By doing so, you can reduce the likelihood of the sensor malfunctioning and can prolong the lifespan of your vehicle.


In conclusion, OBD-II Code P2ADA can be a frustrating issue for any driver. If you notice the symptoms related to this code, it’s important to bring your vehicle to a trusted mechanic right away. Understanding what the code means, what causes it, and how it can be repaired is essential knowledge for any driver. By keeping up with the maintenance of your vehicle, you can prevent issues like P2ADA from arising, and you can prolong the lifespan of your engine.

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