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An on-board diagnostic or OBD-II code alerts you to the potential issues your vehicle may have. But to solve the code, you must first know what issue has caused it to be logged in the system. If you’re finding it difficult to figure out what code P010B means, you’ve come to the right place. Read on to learn about its possible triggers and common symptoms.

What Does the P010B Code Mean?

Diagnostic trouble code (DTC) P010B stands for “Mass or Volume Air Flow “B” Circuit Range/Performance.” This error code is set when the powertrain control module (PCM) perceives a potential problem with the mass air flow (MAF) sensor or its circuit. It is specifically logged when the PCM detects that the signal from the MAF sensor exceeds factory specifications.

image of a MAF sensor
Code P010B may register if the PCM perceives a potential problem with the MAF sensor or its circuit.

The “B” circuit specified in this code varies depending on the make and model of the car. Refer to a repair manual specific to your vehicle to determine the affected circuit.

The MAF sensor is used to measure the volume and density of air entering the engine. It is located on the engine’s air intake tract opposite the air filter. The PCM uses the data provided by the MAF sensor, along with the input from the other sensors, to determine the amount of fuel needed to run the engine properly.

However, if the signal the PCM received from the MAF sensor is determined to go over the expected range, the PCM will log error code P010B. Depending on the severity of the problem, other DTCs may also get stored, such as codes P010A, P010C, P010D, and P010E.

Some vehicle models are more prone to code P010B than others. Have a technician check your vehicle immediately if you own a Infiniti (especially Infiniti G25x and G37), Bentley, Jaguar, Chevrolet, or Nissan and your diagnostics show P010B.

Note: The definition of code P010B may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Possible Causes of the P010B Code?

P010B is a generic code, so it can have several causes. Here are the most common:

  • Contaminated MAF sensor
  • Defective MAF sensor
  • A leak in the air intake
  • Wiring issue
  • Faulty PCM
  • Blocked catalytic converters (usually in GMC/Chevrolet models)
catalytic converter
Blocked catalytic converters in some GMC and Chevrolet models can cause code P010B.

What are the Common Symptoms of the P010B Code?

You may notice the following symptoms if you own a vehicle with a stored P010B trouble code:

  • Check engine light is on
  • Poor engine performance
  • Black exhaust
  • Poor fuel mileage

How to Diagnose the P010B Code

Further complications can be prevented by troubleshooting the P010B error code immediately. However, diagnosing this code can be difficult as it shares numerous triggers and symptoms with other DTCs. All cars are built differently, so the diagnostic steps will vary depending on the vehicle’s make and model.

The procedure for diagnosing a P010B on a Nissan may prove different from testing for the same code on a Land Rover. To ensure you’re doing the right steps, always refer to a repair manual specific to your vehicle. However, if you feel that your automotive know-how is still lacking, it would be best to leave the diagnosis to the experts.

black smoke car
Black exhaust is a common symptom of code P010B.

How to Fix the P010B Code

Code P010B may be set in vehicles of varying makes and models. It may even share similar causes and symptoms with other DTCs. However, this code can’t be resolved with a blanket solution. Each automaker builds their vehicles differently, so a single solution for different models that have logged the same codes may not work.

Always refer to your vehicle’s factory repair information before DIY-ing any repairs. Alternatively, you may opt to bring your vehicle to an auto repair shop for proper diagnosis and repair.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.

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