P00BC MAF “A” Circuit Range/Flow Performance Too Low

OBD2 - P00bc - Technical Description

P00BC - Mass or Volume Air Flow "A" Circuit Range/Performance - Air Flow Too Low

What does DTC P00BC mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles with a Mass Air Flow or Volume Air Flow Meter (BMW, Ford, Mazda, Jaguar, Mini, Land Rover, etc.) ). Although general in nature, specific repair steps may vary depending on the year of manufacture, make, model and / or transmission.

The mass air flow (MAF) sensor is a sensor located in the vehicle's engine air intake tract after the air filter and is used to measure the volume and density of air drawn into the engine. The mass air flow sensor itself only measures a portion of the intake air, and this value is used to calculate the total intake air volume and density. A mass air flow sensor may also be referred to as a volume air flow sensor.

The powertrain control module (PCM) uses this reading in conjunction with other sensor parameters to ensure proper fuel delivery at all times for optimal power and fuel efficiency.

Basically, this Diagnostic Trouble Code (DTC) P00BC means there is a problem in the MAF or MAF sensor circuit "A". The PCM detects that the actual frequency signal of the MAF sensor is outside the predetermined expected range of the calculated MAF value, in which case it determines that the airflow is too low.

Pay attention to the "A" part of this code description. This letter denotes either part of the sensor, or a circuit, or even one MAF sensor, if there is more than one in the car.

Note. Some MAF sensors also include an air temperature sensor, which is another value used by the PCM for optimal engine performance.

Photo of the mass air flow sensor (mass air flow):

Symptoms

Symptoms of a P00BC code may include:

• Malfunction Indicator Lamp (MIL) illuminated (also known as engine warning lamp)
• Engine runs unevenly
• Black smoke from the exhaust pipe
• stolling
• Engine starts hard or stalls after starting
• Possible other symptoms of handling
• Rough engine work
• Black smoke from the exhaust pipe
• Difficulty starting or stopping the engine
• Poor throttle response and acceleration
• Reduced fuel consumption

Possible Causes P00BC

Possible causes of this DTC may include:

• Dirty or dirty MAF sensor
• Faulty MAF sensor
• Intake air leaks
• Damaged intake manifold gasket
• Dirty air filter
• MAF sensor wiring harness or wiring problem (open circuit, short circuit, wear, poor connection, etc.)

Note that other codes may be present if you have a P00BC. You may have misfire codes or O2 sensor codes, so it is important to get a “big picture” of how the systems work together and affect each other when diagnosing.

Diagnostic steps and possible solutions

The best first steps for this P00BC diagnostic code is to check the Technical Service Bulletins (TSB) that apply to your year/make/model/engine and then perform a visual inspection of the wiring and system components.

Possible diagnostic and repair steps include:

• Visually inspect all MAF wiring and connectors to ensure they are intact, not frayed, broken, routed too close to ignition wires / coils, relays, engines, etc.
• Visually check for obvious air leaks in the air intake system.
• Visually * carefully * inspect the MAF (MAF) sensor wires or tape to see contaminants such as dirt, dust, oil, etc.
• If the air filter is dirty, replace it.
• Thoroughly clean the MAF with a MAF cleaning spray, usually a good DIY diagnostic / repair step.
• If there is a mesh in the air intake system, make sure it is clean (mostly VW).
• Loss of vacuum at the MAP sensor can trigger this DTC.
• Low minimum airflow through the sensor hole can cause this DTC to set at idle or during deceleration. Check for vacuum leaks after the MAF sensor.
• Use a scan tool to monitor real-time values ​​of MAF sensor, O2 sensors, etc.
• Atmospheric Pressure (BARO), which is used to calculate the predicted MAF, is initially based on the MAP sensor when the key is on.
• A high resistance in the ground circuit of the MAP sensor can set this DTC.
• Perform an exhaust back pressure test to determine if the catalytic converter is clogged.

If you really need to replace the MAF sensor, we recommend using the original OEM sensor from the manufacturer rather than buying replacement parts.

Common Mistakes When Diagnosing Code P00BC

By far the most common cause for a P00BC to persist is a disconnected MAF sensor. When the air filter is checked or replaced, the mass air flow sensor often remains disabled. If your vehicle has recently been serviced and the P00BC code suddenly persists, suspect that the mass air flow sensor is simply not connected.

Some of the common mistakes made when changing the diagnostic OBD code P00BC are:

• intake manifold leak
• Mass Air Flow (MAF) Sensor Malfunction
• Powertrain Control Module (PCM) Failure
• Wiring problem.

Other Diagnostic Codes Related to OBD Code P00BC

P00BD - Mass or Volume Air Flow "A" Circuit Range/Performance - Air Flow Too High

P00BE - Mass or Volume Air Flow "B" Circuit Range/Performance - Air Flow Too Low

P00BF - Mass or Volume Air Flow "B" Range/Performance

Replace/repair these parts to fix OBD code P00BC

1. Engine control module — OBD error code P00BC can also be caused by a malfunctioning ECM. Replace defective components immediately. 
2. Powertrain control module — Error code P00BC also refers to problems with the power unit, which is unable to respond in a timely manner, resulting in engine timing distortion. Find all transmission related parts with us. 
3. Diagnostic tool - use professional scan and diagnostic tools to detect and fix OBD code error. 
4. Automatic switches and sensors . Faulty switches or faulty sensors can also cause the OBD error to flash. So, replace them now. 
5. Air temperature sensor . The air temperature sensor is normally exposed to the air entering the engine. Since this is a very important step in the combustion process, this sensor plays a critical role in performance. Replace the failed sensor now! 
6. Air intake kits  — The air intake system checks the correct ratio of air and fuel entering the engine. Buy quality air intake kits from us to improve engine performance.
7. Mass air flow sensor  . A faulty mass air flow sensor can cause the engine to not start or idle, as well as loss of power. Replace damaged/failed MAF sensors today!

P00bc limp mode fault MAP Sensor Cleaning, & Changing air Filter

Need more help with your p00bc code?

If you still need help with DTC P00BC, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.