What Does Code P0243 Mean On 6.7 Cummins? (How to Fix It)

You’re probably already familiar with Diagnostic Trouble Codes, or DTCs, which appear when your vehicle or engine experiences various malfunctions. And you’ve come to find out what one of these codes, P0243, means today, haven’t you? So without a second delay, let’s get into the basic info.

The P0243 code on your 6.7 Cummins is a generic OBD-II code that indicates that the ECM or PCM has detected a short or open circuit in the turbocharger wastegate solenoid. 

There are a few possible reasons behind this code; we’ll now get into the root of this issue. Besides, we will also take an in-depth look into the symptoms and probable solutions. Ready? Let’s go!

What Does Code P0243 Mean On 6.7 Cummins?

As mentioned earlier, the P0243 code means there is a malfunction in the turbocharger wastegate solenoid A. The Engine Control Module (ECM) controls the boosting pressure in a diesel or gasoline engine.

The ECM carries out the task simply by maneuvering the output circuit to the ‘A’ wastegate control solenoid.

If the ECM cannot identify the probable issue due to the issue in the electrical circuit, it displays the code P0243. Here is a simple breakdown of the code.

  • P = OBD-II Diagnostic Powertrain
  • 0 = Intake Valve Control Solenoid Circuit Low
  • 2 = Barometric Pressure Circuit High Input
  • 43 = Specific fault index (In our case, Exhaust Gas Recirculation Sensor B Circuit High)

How Serious Is Code P0243 On 6.7 Cummins?

Of course, when the P0243 code first appears, the engine will not suffer any immediate damage. However, there is no reason to take the code lightly.

The wastegate along with its wastegate solenoid controls the turbo boost pressure in the intake in the case of most engines, such as the 6.7 Cummins. If somehow the solenoid is faulty, then the ECM can’t enable itself and maneuver the turbo boost.

And what does that result into? Yes, you guessed it right; a lack of power or power loss!

Imagine a situation when the engine needs more power, and the solenoid fails and results in power loss, you can guess what happens next. And if this goes on, the engine might even suffice permanent damage.

What Causes P0243 Code On 6.7 Cummins?

P0243 can appear for a variety of reasons. The most common cause is an open or shorted turbocharger wastegate solenoid. Let’s view the other probable causes behind the problem as well-

  • A corroded or broken solenoid connector results in an open circuit
  • A broken wire results in the open circuit
  • Shorted to power wiring in the solenoid circuit
  • Malfunctions in the wastegate
  • A dysfunctional ECM or PCM

Other Symptoms Of Getting Code P0243 On 6.7 Cummins

How will you possibly know if there is a P0243 code running on your engine if you have no clue about it? Hence, there are some symptoms. One common symptom is the illumination of the check engine light, the other symptoms are:

  • Illumination of the warning light for the service engine
  • Inability to control the engine’s turbo boost, as a result, an engine under boost occasionally
  • Low power supply during acceleration since the solenoid is unable to control the boost pressure amount.
  • power loss when performing some tasks

How To Fix Code P0243 On 6.7 Cummins?

If you are reading this section, you’re probably an automobile enthusiast or an expert but if you are not, then take the problem on your 6.7 Cummins to a professional. Before we get into the details of repairing the code P0243 causes, you have to go through the diagnosis phase.

 Step 1: Test the Solenoid and Associated circuits 

Before you run to a conclusion, it is important to test the solenoid along with some of its related circuits.

The solenoid has 2 wires; you need to disconnect the harness to the solenoid. Use a Digital Volt-Ohm Meter (DVOM), connecting its wires to each end of the solenoid.

Remember to check out the resistance specifications given by the manufacturer. If the DVOM shows zero resistance or infinite resistance, then you have a shorted solenoid. Replace it as soon as possible.

Step 2: Check the power circuit Voltage

If the resistance comes out ok, make sure the ignition is on. And look for 12 volts in the solenoid power circuit. If the voltage is absent, the wiring needs repair or replacement as per the condition.

Step 3: Replace Solenoid

When everything is okay but somehow the solenoid isn’t functioning efficiently, replace the discharge pressure control solenoid.

Step 4: Replace Wastegate

With a functional solenoid, there may be an issue with the wastegate if the code P0243 keeps popping. Hence, you need to replace the wastegate.

Step 5: Replace or reset ECM/PCM

Rarely, the ECM/PCM isn’t functioning as it should. But if that is the case, you need to reset it. If resetting doesn’t change anything, replace it immediately.

How Much Does It Cost To Fix 6.7 Cummins P0243 Code?

If you are going to hand it over to a mechanic, the fixing will probably take about an hour. However, if the ECM needs replacement, it’ll probably take longer.

The diagnosis and labor costs vary as per vehicle type, engine type, model, and region as well. The hourly rate would range from $75 to $100.

If the solenoid needs replacement, a new one will cost $50 to even $500. The cost of a new wastegate ranges from $45 to $80. And finally, if the ECM needs to be replaced, it will cost almost $800.

Can You Drive Your 6.7 Cummins With Code P0243?

Yes, you can drive, but you should not do it for a long time. If you are driving your car and suddenly see symptoms of the code P0243 on the engine, you cannot just stop midway.

Although it is not a very serious issue that’ll cause your engine to fail at once, you need to address it as soon as possible.

The most common cause of code P0243 is a faulty solenoid, which causes problems controlling the turbo boost and, as a result, power loss. So, if the power goes out right when you need it, that’s a problem.

And if this persists, you may even fail to recover the engine status. Hence, it’s recommended to fix the code P0243 on your 6.7 Cummins without delay.

Conclusion

When a symptom of the code P0243 appears, it causes concern for anyone who owns a valuable vehicle or has a Cummin engine in their vehicle.  We hope this troubleshooting guide has been of good assistance so you can now detect the issue and solve it in no time.

Here’s a tip for saving damage; do not neglect the signs and get into diagnosis, or take your engine to a mechanic as soon as you can.

Otherwise, you’d just be digging a grave for your 6.7 Cummins with the P0243 code. So, get on your feet, grab your toolbox, and investigate what’s wrong with the mighty engine.

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