P2150 OBD-II Trouble Code: Fuel Injector Group B Supply Voltage Circuit Low

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P2150 is a diagnostic trouble code (DTC) for "Fuel Injector Group B Supply Voltage Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P2150 code definition

The P2150 code is a generic powertrain code related to fuel or air meter injection system issues, including a fuel injector problem. In this case, the engine control module (ECM) has received a signal from the fuel injector group B circuit that is lower than preset threshold parameters.

Codes related to the P2150 include:

What the P2150 code means

A P2150 code is stored when the ECM is sent a voltage reading for a set of fuel injectors that is outside of preset parameters. In this case, the ECM has detected an issue with Group B, which is typically engine Bank 2, containing Cylinder 2.

Typically, voltage signals will need to be at least 10% lower than preset parameters. Check your vehicle’s service manual for specifics for your vehicle’s make and model.

What causes the P2150 code?

Several problems may cause a P2150 code including:

  • Damaged wiring
  • Corroded or faulty wiring or connectors
  • Damaged or defective fuel injector driver
  • Damaged, faulty, or blown fuse(s)
  • Damaged or defective ECM (rare)

What are the symptoms of the P2150 code?

Symptoms of a P2150 code may include:

  • Check engine or warning light may illuminate
  • Engine may idle roughly or shudder
  • Vehicle may start up slowly when the engine is cold
  • There may be an excess of smoke at vehicle start up
  • The engine may misfire
  • Vehicle may hesitate during acceleration

How does a mechanic diagnose the P2150 code?

A mechanic may use several methods to diagnose a P2150 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P2150 trouble code
  • Utilize a digital volt/ohmmeter to test for a constant power supply to the Fuel Injector Group B
  • Check system fuses and relays for possible damage
  • Test for continuity and resistance for circuits related to Fuel Injector Group B
  • Remove Fuel Injector and observe fuel spray pattern for abnormalities

Common mistakes when diagnosing the P2150 code

At times, the ECM is replaced when the actual problem is damaged circuitry in the fuel injection system. It is recommended to fully diagnose all possible causes for the P2150 code before replacing the ECM.

How serious is the P2150 code?

Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P2150 code, in addition to the possibility of excess vehicle emissions, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.

What repairs can fix the P2150 code?

Several repairs can fix a P2150 trouble code and include:

Additional comments for consideration regarding the P2150 code

Typically, additional engine misfire codes will accompany a P2150 trouble code. It is recommended to diagnose and repair codes in the order in which they appear, as subsequent codes may be a symptom of a larger problem.

In addition, a common cause for this problem is due to animals seeking shelter in the engine compartment, who then gnaw on and damage wiring.

Need help with a P2150 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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37 years of experience
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BMW 740Li - Check Engine Light is on - Roseville, California
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