OBD-II Trouble Codes

P00BC Code: Mass Air Flow (MAF) “A” Circuit Range / Performance – Air Flow Too Low

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Trying to understand trouble codes may seem intimidating at first. The combination of letters and numbers may confuse anyone without prior knowledge about these codes.

If you’re struggling to understand the meaning of the trouble code P00BC or if you want to know more about its symptoms and causes, this guide is for you.

What Does the P00BC Code Mean?

Diagnostic trouble code (DTC) P00BC stands for “Mass or Volume Air Flow “A” Circuit Range/ Performance – Air Flow Too Low.” This code sets when the powertrain control module (PCM) detects a potential issue with the mass air flow (MAF) sensor or its circuit. It may also register if the PCM determines that the actual frequency signal coming from the MAF sensor does not correlate with or is lower than the expected range.

mass air flow sensor
When your PCM detects a potential issue with the MAF sensor or its circuit, it may trigger code P00BC.

The “A” in this code’s definition refers to a part of the MAF sensor or its circuit. In some cases, it may refer to a single sensor if the vehicle has multiple MAF sensors.

Note: The definition of code P00BC may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

The MAF sensor measures the volume and density of air entering the engine. You can find it mounted on the engine’s air intake tract, downstream from the air filter. This sensor is also called the air flow sensor.

The PCM uses the data from this sensor, as well as from other sensors, to determine how much fuel the engine needs to run properly. Some MAF sensors may also integrate an air temperature sensor that the PCM also uses to maximize engine performance.

The P00BF code (Mass or Volume Air Flow “B” Circuit Range/ Performance- Air Flow Too High) is related to the trouble code P00BC.

automotive maf sensor 1
MAF sensor failure can cause the P00BC code.

What are the Possible Causes of the P00BC Code?

Diagnostic trouble codes, like the P00BC code, indicate the nature and the location of the potential issue in the vehicle. As such, they cannot point to a specific root cause of the problem. Many DTCs have several possible causes, and the P00BC code is no different. Below is a list of the likely reasons why P00BC sets:

What are the Common Symptoms of the P00BC Code?

When a DTC sets, the vehicle’s computer system sends a signal to illuminate the check engine light. For some codes, an active check engine light may be the only indication of a potential issue, although many codes show other signs. Some of the most common symptoms of the P00BC code are listed below:

How to Diagnose the P00BC Code?

While an accurate diagnosis is crucial in fixing a diagnostic trouble code, the process itself is quite tedious. Diagnosing trouble codes involves ruling out several possible causes of a potential issue. In addition, troubleshooting requires obtaining more information about the problem. For example, in the case of P00BC in a 2018 Ford Expedition XL, the user or the mechanic will need to find out if other DTCs are present. They will also need to determine the type of MAF sensor affected before proceeding to the actual troubleshooting procedures.

car engine runs rough
One of the common symptoms of code P00BC is a rough running engine.

If you plan to diagnose and repair the trouble code P00BC yourself, you’ll need the right tools and sources. Vehicle-specific repair manuals and databases are the best references available because they provide detailed repair instructions and helpful illustrations. You can also access other repair materials online, such as how-to videos and blogs.

How to Fix the P00BC Code?

Fixing the P00BC code requires determining the root cause of the problem and finding vehicle-specific repair instructions. After all, vehicles are made differently, depending on the manufacturer. No two vehicles will have the same solution for a single trouble code. Repair instructions for P00BC on a BMW vehicle may not effectively fix the P00BC on a Volvo.

While repair manuals and databases may help seasoned DIYers fix the existing issue, consulting a certified professional is also an option, especially if you lack experience fixing DTCs.

Other Notes About P00BC

If you encounter the trouble code P00BC, there may be other codes stored along with it as well. In some cases, misfire codes or oxygen (O2) sensor codes may also set.

Intake manifold gasket replacement or mass airflow sensor replacement are common solutions to the P00BC code. However, these solutions may not be effective in some cases, so make sure to troubleshoot the issue carefully.

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