Error Code P2631: What It Means & What To Do?

<<See All OBD Codes

You just found out that the P2631 code has been set in your vehicle and are a little confused. Well, good that you have landed at the right place. We will help you understand the code, what it means and how to diagnose and resolve it. This code is set due to an issue noticed by the Powertrain Control Module (PCM) with regards to the oxygen sensor. It is also defined as an O2 Sensor Pumping Current Trim Circuit High. The PCM will set this code if it notices an error with the oxygen sensor. Read on to know more about it and what causes the code to set in the first place.

The oxygen sensor performs a special function; its main task is to measure the amount of oxygen present in the exhaust gases after they have left the engine once the combustion process is over. This information is passed on to the PCM, if the PCM notices an open or short circuit in the Air Fuel Radio (A/F) or O2 sensor, which is causing a high voltage signal wire to the ECM it will set the P2631 code. The check engine light will be on to warn the driver about an issue present in the vehicle. Poor performance of the oxygen sensor can be noted in the decreased fuel efficiency.

What causes this problem with the O2 Sensor Pumping Current Trim Circuit High B2S1?

• If the A/F or O2 sensor signal wire voltage which is monitored by the Engine Control Module (ECM) is higher voltage than expected
• There’s a short of the O2 sensor signal return wire to a 5-volt reference wire

1. O2 Sensor - This sensor detects the amount of oxygen present in the exhaust gases after the combustion process has taken place. A problematic O2 sensor can cause the P2631 code to set by the PCM. Resolve this issue via repairs or replace the sensor easily with PartsAvatar. We offer free shipping on orders over CAD $99.
2. Oxygen Sensor Electrical Connector - Are electrical component that helps transfer the information to the PCM regarding the amount of oxygen present in the exhaust gases. If the connector is damaged or faulty simply repair it. If that doesn’t help with getting rid of the P2630 code you will have to opt for replacement. Choose from a wide range of brands and prices of connectors on our website. You can chat with our customer care executive available 24/7 in assisting you to find the best one for your vehicle.
3. Oxygen Sensor Fuse/Relay - This is an electronic component is in use all the time which means it tends to deteriorate quickly. If you have found an issue with the relay you will have to find a replacement for it. You can find it on our website and order the one suited for your vehicle. Track your shipment till it reaches you in just a matter of days!
4. Powertrain Control Module - Is the central processing unit of your vehicle. The oxygen sensor passes on information regarding the amount of oxygen present to the PCM. A problematic PCM can cause the P2631 code to set. You can first try to repair the issues, or replace the entire PCM. Find the perfect fitment for your vehicle at PartsAvatar, and order online easily. Remember that PCM replacement require some level of reprogramming by a professional.
5. Diagnostic Tools - The tools needed in order to perform diagnoses are called diagnostic tools. Having the right tools can help you get rid of the P2631 code, order all the ones you need from the comfort of your home and have them delivered to your doorstep!
6. Engine Control Module - Is the brain of your vehicle and monitors all the sensors and their functions. If there’s any issue with the ECM this P2631 code can be set. You can find ECM online from PartsAvatar. Order online and don’t worry, we will send it to you no matter where in Canada you are located!

Well, if you are looking to know about the common symptoms related to this error code P2631, we have worked out a small list to help you discover this error code with your vehicle.

Common Symptoms

• The Check Engine light is on
• The P2631 code is set in the engine memory
• Your vehicle's engine is unable to go into closed fuel loop it also goes into failure mode fuel control.
• Lowered fuel mileage
• Hesitation of engine in starting

Once you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle’s

• Repair or replace the A/F O2 sensor.
• Replace or repair any shorted wire harness to the A/F O2 sensor
• Malfunctioning PCM will have to be repaired or replaced as needed

If you need parts to fix this issue, you no longer need to search for them. We at PartsAvatar Canada have an extensive range of auto parts in stock from you, ranging from all replacement parts to all interior and exterior parts

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P2631 code to be stored:

Connect the scanner to the diagnostic port of your vehicle and retrieve all the codes present and freeze frame the data. Make a note of all the codes these will help you understand if there’s an intermittent condition present as well. Once you have done that you can proceed to clearing the codes and taking your vehicle for a test drive. If the PCM enters readiness mode then you’re likely having an intermittent condition, these unfortunately need to worsen to be able to accurately diagnose them. If the code rests you can continue your diagnosis.

Now you can check the O2 sensor and the wiring harness for any damages like cuts that may be present in the harness causing short. Once that is done you can move on to inspecting all the wiring and circuitry associated with this sensor, and see if they’re all in good condition. All the faulty wiring will have to be repaired or replaced. The corroded connectors will have to be cleaned, you may even find burned or bent pins of the connector, depending on the extent of damage you can choose between repairs or replacements.

It’s time to scan the O2 sensors and check the voltage using a DVOM, they should all be within the range prescribed by the manufacturer. Check the voltage return on the signal wire for any short to reference voltage, fix the issues via repairs or find a replacement. After the repairs and replacements if the code is still setting then you will have to check the PCM for issues.

Replacement of the PCM will warrant reprogramming, you will have to assistance from a trained diagnostician for that.

Common Mistakes When Diagnosing the P2631 Code

• Clearing all the OBD codes before making note of them or freeze framing the data. This will result in duplication of repairs and replacement.
• Hastily replacing the A/F or O2 sensor without checking the electrical components like wiring connector for short to reference voltage