P2149 Fuel Injector Group B Malfunction / Open

P2149 Fuel Injector Group B Malfunction / Open

OBD-II DTC Datasheet

Fuel Injector Group B Circuit / Open

What does this mean?

This is a generic powertrain diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles. This may include but is not limited to vehicles from Dodge Ram (Cummins), GMC Chevrolet (Duramax), VW, Audi, Ford (Powerstroke), Mercedes Sprinter, Peugeot, Alfa Romeo, Nissan, Saab, Mitsubishi, etc. exact stages Repairs may vary depending on the year of manufacture, make, model and transmission configuration.

Fuel injectors are an integral part of the fuel delivery systems in modern vehicles.

Fuel delivery systems use a different number of components to control and monitor volume, time, pressure, etc. The systems are combined with an ECM (Engine Control Module). Fuel injectors were introduced as a replacement for the carburetor because the injectors are more efficient and effective in managing fuel delivery. As a result, they have improved our fuel efficiency, and engineers are actively developing more ideal ways to improve the efficiency of this design.

Given the fact that the atomization of the injector is electronically controlled, the supply voltage is critical to the delivery of fuel to the cylinders. However, a problem in this circuit can and / or cause significant handling problems among other potential hazards / symptoms.

The group letter "B" in this code is used to distinguish which circuit the fault belongs to. To determine how this applies to your specific vehicle, you need to consult the manufacturer's technical information. Some examples of differences with nozzles: bank 1, 2, etc., Twin nozzles, individual nozzles, etc.

The ECM turns on a malfunction indicator lamp (malfunction indicator lamp) with code P2149 and / or related codes (P2150, P2151) when it monitors for a problem in the supply voltage to the fuel injectors and / or their circuits. It should be noted that the fuel injector harnesses are routed in close proximity to extreme temperatures. Due to the location of the belts, they are not resistant to physical damage. With this in mind, I will say that in most cases it will be a mechanical problem.

P2149 Group B fuel injector circuit / open circuit active when the ECM detects an open or malfunction in the fuel injector supply voltage circuit.

What is the severity of this DTC?

Pretty harsh, I'd say. In the field, we call the lack of fuel in the combusted mixture the "lean" state. When your engine is running on a lean mixture, you run the risk of causing serious engine damage both in the near and distant future. With this in mind, always keep an eye on the maintenance of your engine. There is some diligence here, so let's keep our engines running smoothly and efficiently. After all, they pull our weight to transport us every day.

What are some of the symptoms of the code?

Symptoms of a P2149 trouble code may include:

• Unstable engine performance
• Misfire
• Reduced fuel economy
• Unstable idle
• Excessive smoke
• Engine noise (s)
• Lack of power
• Can't climb steep hills
• Reduced throttle response

What are some of the common causes for the code?

Reasons for this P2149 fuel injector group supply voltage code may include:

• Defective or damaged fuel injectors
• Damaged wire harness
• Internal wiring malfunction
• Internal ECM problem
• Connector problem

What are some steps to troubleshoot the P2149?

Basic step # 1

The first recommended step is to determine which "group" of sensors the manufacturer is talking about. With this information, you will be able to find the physical location of the injector(s) and their circuits. This may require the removal of numerous engine covers and/or components to gain visual access (if possible). Be sure to check the harness for broken wires. Any worn insulation should be properly repaired with heat shrink tubing to prevent further and/or future problems.

Basic step # 2

Sometimes water and / or liquids can get stuck in the valleys where the nozzles are installed. This increases the likelihood that the sensor connectors, among other electrical connections, will corrode faster than normal. Make sure everything is in order and the tabs on the connectors are properly sealing the connection. Feel free to use some kind of electrical contact cleaner to keep everything plugging in and out smoothly, not to mention increasing electrical connections in connections using this product.

Basic step # 3

Check for continuity by following the troubleshooting steps in your specific vehicle service manual. One example is to disconnect the supply voltage from the ECM and fuel injector and then use a multimeter to determine if the wires are in good working order.

One test I like to do to quickly determine if there is an open in a particular wire that can help with code P2149 is to perform a "continuity test". Set the multimeter to RESISTANCE (also known as ohms, impedance, etc.), touch one end to one end of the circuit, and the other end to the other end. Any value higher than desired may indicate a problem in the circuit. Any problem here will need to be determined by tracing the specific wire you are diagnosing.

Related DTC discussions

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• 2003 Dodge Ram 2500 Cummins P2149 and P0204 codesDodge Ram 2003 Cummins 2500, assistance required troubleshooting DTCs P0204 and P2149. Engine runs unevenly, no power. Code P0204 says "Cylinder 4 Injector Circuit Malfunction" and P2149 says "Injector Group B Supply Voltage Open Circuit." I think the problem may be a faulty injector or injection ... 

Need more help with the P2149 code?

If you still need help with DTC P2149, post a question in the comments below this article.

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