6 Causes Of P0243 Cummins DTC And Quick Fixes

What do the p0243 Cummins error codes mean? It means there is a malfunction in the wastegate actuator solenoid. As well as we know, it is a diagnostic code for a faulty fuel injection system. Meanwhile, it represents an open or short circuit in the electrical power supply to the fuel injector.

The p0243 error code can happen for several reasons: faulty wastegate actuator solenoid, broken wires, blown up fuse, corroded solenoid connectors, fault in the engine control module, and defective wastegate control valve.

P0243 Cummins

Check out the probable causes and the symptoms experienced by many Cummins engine troubleshooters.

Probable CausesSolutions
Faulty wastegate actuator solenoidReplace the faulty wastegate actuator solenoid
Broken wiresChange the broken wires
Blown up fuseReplace the blown-up fuse
Rusted ignition coilsReplace the ignition coil
Fault in the engine control moduleReplace the engine control module
Faulty Wastegate Regulate InletReplace it.

However, let’s check all the reasons and solutions to fix the p0243 error codes in the below guide.

Faulty Wastegate Actuator Solenoid

The main reason behind this problem is a faulty wastegate actuator solenoid. You will see your vehicle flashing the p0243 error code. It will also give your truck less boost during starting and cause starting issues.

Solution: In this case, you need to replace the faulty wastegate actuator solenoid to solve this issue.

Broken Wires

In some cases, the wires can be broken at the wastegate actuator solenoid to cause this problem. It can show a check engine light message on your 2004 Dodge Ram 2500 SLT Cummins pickup along with the p0243 error code.

Solution: To solve this p0243 code dodge Cummins issue, you have to use a multimeter to check for continuity in the wiring harness and replace any broken or shorted wires

Blown Up Fuse

Sometimes, your 2005 Dodge Ram 2500 SLT Cummins pickup shows the p0243 error code. In your pickup, there is a fuse that both the A/C fan clutch circuit and the Wastegate Solenoid share. This fuse can be blown up and cause this error code.

Solution: To solve this p0243 fuse issue, you must find out and replace the blown-up fuse.

Rusted Ignition Coil

Some people have reported facing the 2005 Cummins p0243 code issue on their 2005 Dodge Ram 3500 Laramie Cummins pickup. They also said they had faced this problem after their pickup was idle for one week, and they only bought their pickup two weeks ago. Also, they noticed the check engine light came on.

Also Read: P1507 Cummins | Solve The Dodge Trouble Code

If you also face this problem, then you need to know that this problem happens for rusted solenoid coils. Also, if there is any issue in the solenoid connectors, then the p0243 error code can start flashing.

Solution: To solve this p0243 code 05 Cummins engine issue, you need to replace the solenoid connectors or clean them with corrosion remover.

Fault In The Engine Control Module

Sometimes you can get the p0243 error code and rough running issues on your vehicle. However, this error code means the wastegate solenoid actuator is malfunctioning.

Mainly the wastegate solenoid actuator is regulated by the engine control module (ECM), and if there is any fault, you will show the p0243 error code.

Solution: In this case, find out the root of the fault in the engine control module to remove this error code.

Faulty Wastegate Regulate Inlet

You can also face the p0243 error code issue on your 2004 dodge 3500 5.9l Cummins pickup for a defective wastegate control valve. In addition, you will see the check engine light come on.

Solution: In this case, you need to replace the faulty wastegate regulator nozzle to solve the issue.

A Helpful Tutorial You May Need!

Frequently Asked Questions (FAQs)

How do I fix code P0243?

Many fixes can be done to solve the P0243 error code problem. The main fixes are replacing a wastegate actuator solenoid with an open circuit and fixing or changing a solenoid connector with corrosion in the pins. Besides, other fixes include replacing the fuse and replacing the engine control module.

How much horsepower does a 59 Cummins have?

From 1989 to 2007, Dodge Ram trucks featured 5.9l Cummins engines. For instance, the engines managed to produce 160 horsepower between 1989 and 1993. Furthermore, from 1994 to 1998, the 5.9l Cummins engines produced 175-235 horsepower, depending on the year. Similarly, the 3rd generation 5.9l Cummins engines from 1998 to 2002 had 235 to 245 hp. Whereas the last generation of 5.9l Cummins engines managed to produce 305 to 325 horsepower from 2003 to 2007.

How much horsepower can you get out of a stock 24 valve Cummins?

The 24 valves from 1998-2002 Cummins engines can produce 235 to 245 HP and 460 to 505 lb-ft of torque. Maximum stock 24 valve Cummins will hold almost 1200 horsepower while only containing a minimum pressure decrease between the inlet and outlet. The last generation 5.9l Cummins engines between 2003-2007 stock 24 valves, can produce 305 to 325 horsepower and 600 to 650 lb-ft of torque.


The p0243 Cummins code is a bit of a mystery. Many problems can cause it, and the diagnosis is not always straightforward. It is a diagnostic trouble code set when the engine control module (ECM) detects fuel pressure control system issue.

It can be set if the ECM detects a problem in the fuel pressure regulator or an open or shorted fuel pressure regulator circuit.

To assist you, we’ve compiled a list of six possible causes and solutions for this error code, which you can review below. We keep hoping that you, too, are now able to resolve the error code concern effectively.

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D Conroy

Meet our senior writer and content manager of Automasterx. He has worked in several mechanical garages and mastered different vehicle diagnoses and parts repair. He never stops until finding out the ultimate solutions for any vehicle fault code. However, ensuring the only solid solutions for each vehicle malfunction is his core part of the duty, alongside analyzing fault codes and signals.

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