P026D Duramax code isn’t very common and much concerning for a vehicle with a Duramax engine. Major reasons of the error code are low fuel economy, poor engine performance, wet spark plug, and the exhaust can give off a fuel smell if left unsolved.
To clear the OBD2 P026D error code, you may need to check and repair the fuel injector, air filter, NOx sensor, and MAF sensor which require enough skills and equipment. So it’s best to leave the job to the expert mechanic even if costs around $150.
Article Summary
What Does P026D Error Code Mean?
In the calibration, there is FSA (Fuel Setpoint Adaptation) that is used to measure the exact injected fuel quantity. This measurement is then used to correct ECM (Engine Control Module) set points for various components like fuel rail pressure, boost pressure, and EGR.
The FSA also measures the accurate injected fuel quantity using the MAF (Mass Air Flow) and nitrogen oxide sensor’s input to calculate the air and fuel ratio.
But if it gets incorrect airflow parameters due to blockages, leaks faulty EGR, malfunctioning fuel injectors, or faulty MAF sensors, the distorted air-fuel ratio can affect the FSA negatively. If the fuel injection quantity is more than 10 s, it can set OBD2 P026D. However, if the quantity is less than 10 s, it’ll set OBD2 P026C.
Causes of OBD2 P026D Duramax Code
Below are some common that can trigger OBD2 P026D error code on your vehicle with a Duramax engine:
- Dirty air filter
- Air leaks
- Air restrictions
- Damaged NOx sensor
- Bad fuel injector
- Faulty MAF sensor
Diagnosis of Duramax Engine OBD2 P026D Error Code
You can follow some steps to diagnose the issue that triggered the P026D trouble code. Firstly, check all the electrical wiring, connectors, and circuits for erosion, becks, and loose connections. If you find any of these parts faulty, replace or repair them.
After fixing the issue, reset the code and test drive the car to check if the code is stored again. If the code still exists, check the boost sensors, injectors, and EGR system for failure or damage. Make sure that the NOx sensor doesn’t detect too little oxygen in the system. But if you don’t find any fault in the diagnostic’s conclusion, install injectors and the right part number boost sensor.
With the engine off, make sure the EGR delta and boost reading zero keys are on. You may also need to road test the engine and compile an engine sensor’s datalog as well as high boost pressure.
If you find it tiresome, let the task be handled by an expert mechanic. They may take around an hour to complete the diagnosing process and charge between $75 and $150 per hour.
How to Fix OBD2 Duramax P026D Error Code
Fixing the P026D trouble code requires deep diagnosing and physical inspection. So you must have enough skills and essential tools to handle the job. Before starting the repair process, access the P026D error code stored in the ECU using a scanning tool. Note the P026D trouble code and other freeze frame data related to the code.
To clear the P026D, you have to work on all the potential issues. There is a reductant injector in the engine system that reduces gas expelling through the particulate filter or catalytic converter.
You have to make sure that the fuel injector, air filter, NOx sensor, and MAF sensor working well. If you find any part of the engine is damaged, repair or replace it. There may also be loose or damaged connections or circuits that trigger the P026D code. If you can finish the engine trouble, the trouble code will be cleared.
Also Read: How To Fix P2563 Code Duramax
Is it Bad for an Engine if the Fuel Pressure is too High?
If the fuel pressure becomes higher due to a bad fuel pressure regulator, the fuel injector will release more fuel than required. An injector open for a few milliseconds that is determined by various sensor’s input to the ECM. If the fuel rail pressure sensor goes bad, it’ll deliver excessive fuel and cause the spark plug to get fouled out.
Hence you may need to replace the spark plug too early. The engine can also run roughly and exhaust can produce black smoke. If the engine runs rich, it can affect the air-to-fuel ratio’s optimal level. In the long term consequences, it can result in reduced gas mileage which isn’t good for the engine’s longevity.
Like the high fuel pressure, low fuel pressure is also bad for the engine. On your vehicle with carburetors, it can cause the engine to run out of gas too quickly particularly when used at high power. The reason is that low fuel pressure can’t maintain float bowls with fuel.
It can also happen due to clogged fuel filters. Low fuel pressure can make the air and fuel mixture lean on fuel injection. The fuel pressure is usually regulated to a consistent pressure which is around 40 PSI.
FAQs
How do You Read Engine Error Codes?
Each character of the code indicates something about the issue. The first character gives an overview of the error. For example, if the first character is B, something wrong in the body system. For P026D, P represents the powertrain system, “0” is a generic OBD-II code, “2” indicates faulty fuel and air metering, and “6D” is the DTC number.
How do You Manually Reset P026D Codes?
You can manually reset the P026D error code in plenty of ways including using an OBD-II scanner, disconnecting the battery, and turning the ignition to the “on” position 3 to 5 times. To reset the trouble code using a scanner, plug the machine into the port placed under the steering column. Then power on the button and press the scanner’s read button. Finally press the clear or erase button on the scanner. However, the error code should clear automatically after driving the vehicle for 2 to 3 days after repair.
What is the Code P0106 on a Duramax?
The DTC P0106 is stored on the vehicle with the Duramax engine’s computer if the ECM detects a problem with the MAP barometric pressure sensor electric circuit output range. However, it needs deep diagnoses to determine the exact reason that caused the P0106 code.
Final Words
Though the P026D error code won’t cause any immediate problems, you shouldn’t take it lightly. If you take too long time to fix the P026D trouble code on your vehicle with the Duramax engine, it can cause more fuel to be injected into the cylinder.
Hence the engine can run rich and affect the fuel economy. To avoid these consequences, properly diagnose the P026D Duramax and fix the underlying issue by yourself or by hiring an expert mechanic.
