What Is P2146 Code on 5.9L Dodge Cummins? (How to Fix It)

The P2146 OBD2 key is for a diesel engine that does not use fuel injection.

The data from the ECM and the injection pump module are not communicating, as seen in these figures. The solution may be found in the ECM.

It usually happens as the driver accelerates, causing the engine to stall. The ECM and the Injection Pump Module are not sending data. A MAP sensor failure is characterized by unpleasant running symptoms.

Furthermore, a defective MAP sensor may not output a signal in exceptional cases. The ELD code is most likely the result of a different wiring issue.

The following is a quick explanation and definition of the P2146 code.

What Does P2146 Code Mean on 5.9L Dodge Cummins?

This is a general powertrain diagnostic trouble code (DTC) that most OBD-II automobiles will have. Vehicles from Dodge Ram (Cummins), GMC Chevrolet (Duramax), VW, Audi, Ford (Powerstroke), Mercedes Sprinter, Peugeot, Alfa Romeo, Nissan, Saab, Mitsubishi, and others may be affected.

Although the procedures are basic, they may differ based on the year, make, model, and powertrain arrangement. In today’s cars, fuel injectors are an essential component of the gasoline delivery system.

Symptoms of Getting the P2146 Code on a 5.9L Dodge Cummins

The first symptom is that the engine light comes on. The second is that when the gas pedal is pushed, the car does not accelerate.

Another sign is when the accelerator is pressed, the engine stalls. While diagnosing the problem, you may notice a few more symptoms. The first is a drop in gas mileage efficiency.

Low gas pressure is another sign that the engine isn’t getting what it needs. As the part fails, you may hear rattling noises from the back of the vehicle. A possible symptom is an illuminated engine light or a service engine shortly warning light.

The Causing Factors of the Error Code P2146

The several causing factors of the P2146 code is given below:

  1. The engine control module (ECM) receives voltage from the fuel injectors and checks the injector supply voltage. Some vehicles provide voltage in banks or groups. The code P2146 is set and the Check Engine Light is switched on if the voltage supply circuit is open or 0 volts.
  2. A broken wire or connector on the supply voltage circuit
  3. The problem might potentially occur if the Powertrain Control Module’s memory or code is corrupted. The response might also be triggered by a hardware mistake in the PCM.

How Serious Is Code P2146 on 5.9L Dodge Cummins?

The issue is serious since it reduces the engine’s performance. The ECM keeps a close eye on the Fuel Pump Control Module (FPCM).

A substantial failure in the fuel injector voltage supply circuit causes code P2146, which causes the engine to run rough and misfire.

Repairing both control modules might be costly. These critical modules are required for the engine to work correctly.

How to Solve P2146 Error Code on 5.9L Dodge Cummins?

A substantial failure in the fuel injector voltage supply circuit causes code P2146, which causes the engine to run rough and misfire.

The steps to solve this problem are given below:

Step 1- The first step is to figure out which “group” of sensors the manufacturer is talking about.

The physical location of the injector(s) and its circuits may then be determined using this information.

To get visual access, you may need to remove several engine covers and/or components (if possible).

Make sure there are no damaged wires in the harness.

To avoid additional and/or future concerns, any worn-away insulation should be thoroughly repaired using a shrink tube.

Step 2- Water and/or fluids may become “stuck” in the valleys where the injectors are situated from time to time.

As a result, the sensor’s connectors, as well as other electrical connections, are more likely to deteriorate at a faster pace than usual.

Check that everything is in working order and that the connector tabs are correctly sealing the connection.

Don’t be afraid to apply some electrical contact cleaner to ensure that everything connects and disconnects properly, not to mention the enhanced electrical communication inside the connections.

Step 3- Follow the troubleshooting techniques outlined in your vehicle’s service manual to ensure the circuit’s integrity.

Disconnect the supply voltage circuit from the ECM and at the fuel injector, then check the wires with your multimeter to see whether they are in good working condition.

A “continuity test” is one test I like to run to rapidly detect whether there is an open inside a certain wire that might assist with code P2146.

Touch one end of your multimeter to one tip of the circuit and the other end to the other tip, setting it to RESISTANCE (a.k.a.: ohm, impedance, etc.).

Any figure that is more than the target value might indicate an issue with the circuit.

How Much Does It Cost To Solve The Error Code P2146?

“Fuel Injector Group “A” Supply Voltage Circuit/Open” is a diagnostic trouble code (DTC) for P2146.

This can happen for a variety of reasons, and a mechanic will need to figure out what caused the code to be activated in your case.

Certified mobile experts may perform the Check Engine Light diagnostic at your home or workplace for $114.99.

They will be given an upfront quotation for the proposed fix and a credit of $20.0 towards the repair after they have been able to diagnose the problem.

Employing a dealership to fix your vehicle will, of course, be more expensive than hiring an individual mechanic. Unless you have substantial automotive repair expertise, you should not attempt replacement yourself in most cases.

Luckily there’s a website for fixing the issue.

Common Mistakes While Solving the P2146 Code

  1. Before reviewing the freeze frame data for the primary failure fault, clear the ECM memory codes so that the failure can be repeated and fixed.
  2. Failure to clear ECM codes once they have been resolved
  3. Failure to complete the pinpoint test, resulting in the diagnosis of the incorrect portion

Additional Comments to Consider Regarding the P2146 Code

When the trouble numbers appear, there is almost probably a problem with the gasoline pump. This might be an expensive remedy. To keep your fuel pump in excellent working order, there are a few things you should do.

To begin, high-quality gasoline should be used. When you use low-quality gasoline, the fuel pump wears down because it needs to filter a lot of impurities.

As a result, always follow the fuel recommendations of your vehicle’s manufacturer.

Then you should never drive on low fuel or let the automobile get near to running out of gas. While the car is operating on low gas, contaminants build up and clog the component. The gasoline pump eventually fails.

In their compressed state, the lifters are unable to raise their partner push rods beneath the valve rocker arms, resulting in valves that cannot be triggered and stay closed.

Code P2146 is for diesel and certain gas engines, and the failure might be the ECM, or it could be a separate injector driver module on some cars.


Your fuel tank should be cleaned regularly. If you keep your automobile, moisture might get into the gasoline tank and pump. If you don’t drive your automobile or drive it with insufficient gasoline, sediment builds up in the tank. The tank may rust, causing the gasoline pump to fail.

I hope our discussion today gave you all of the knowledge you needed. It was over when it comes to the P2146 code on a Dodge Cummins.

Keep an eye on the code and attempt to fix it as soon as possible. Take into account all of my suggestions and, if required, seek professional aid.

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