P0747 code — how to fix error fast

It’s inevitable that you’ll see some OBD2 codes after a diagnostic scan of your car sometime within its lifespan, and while there are some that are less serious, the P0747 code shouldn’t be ignored. It’s one of the main headaches for drivers of vehicles with automatic transmissions in particular.

So, if you don’t get to the solution fast, you may end up having to replace the transmission and that’s never a good thing. To help you avoid the worst-case scenario, our team of automotive experts will lead the way through this guide on the P0747 code meaning where we’ll outline all the important details on the code’s common causes, diagnostic methods, and preventive measures.

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What does the P0747 code mean?

The P0747 code is a diagnostic trouble code (DTC) that appears when the powertrain control module (PCM) detects an issue with the electronic pressure control solenoid. The electronic pressure control solenoid is responsible for regulating the hydraulic pressure in the transmission. When this solenoid fails, it can lead to a wide range of problems with your vehicle.

When the solenoid fails, it can lead to a number of symptoms, including rough shifting, gear slipping, increased fuel consumption, or even the “check engine” light.

If you notice any of these symptoms, it’s important to get your vehicle inspected as soon as possible. Ignoring the code can lead to serious damage to your car’s transmission.

What causes the P0747 code?

Even though the code mostly points to issues with the solenoid, there are several different reasons why this may happen. Let’s take a look at each one so you can be prepared and have an easier time repairing the issue:

Faulty electronic pressure control solenoid

The most common cause of the code is a faulty electronic pressure control solenoid. This solenoid is responsible for regulating the pressure in the transmission, and when it fails, it can lead to a number of problems.

Low transmission fluid

Low transmission fluid can also cause the code. When the fluid level is low, it can cause the transmission to overheat, which can damage the electronic pressure control solenoid.

Wiring issues

Wiring issues can also cause the P0747 code. If the wiring to the electronic pressure control solenoid is damaged or corroded, it can cause the solenoid to fail.

Failed PCM

In rare cases, a failed PCM can cause the P0747 code. This is usually accompanied by other DTCs and symptoms.

Which car models does the P0747 code affect the most?

The P0747 code can affect a wide range of car models, but some are more prone to this issue than others. The following car models are most likely to be affected by the code:

• Nissan Altima: : The Nissan Altima is one of the most popular mid-size sedans on the market, and it is also one of the most commonly affected by the P0747 code. This issue often occurs in models produced between 2005 and 2010.
• Nissan Maxima: The Nissan Maxima is another popular sedan that has been known to experience issues with this code. This problem is particularly prevalent in models produced between 2004 and 2006.
• Infiniti G35: The Infiniti G35 is a luxury sedan that has been known to experience issues with the P0747 code. This problem is particularly common in models produced between 2003 and 2006.

How to diagnose the P0747 code

Diagnosing the P0747 code can be a complex process, but there are several steps you can take to diagnose the issue. The following are some diagnostic methods to consider:

Scan tool diagnosis

The first step in diagnosing the code is to use a scan tool to retrieve the DTCs from the PCM. This will give you a starting point for diagnosing the issue.

Visual inspection

A visual inspection of the transmission and wiring can also help diagnose the P0747 code. Look for any signs of damage or corrosion on the wiring or solenoid.

Pressure testing

Pressure testing the transmission can help diagnose the P0747 code. This involves attaching a pressure gauge to the transmission and checking the pressure at different gears.

How to fix the P0747 code

Fixing the P0747 code will depend on the underlying cause of the issue. The following are potential fixes for each cause:

Replace electronic pressure control solenoid

If the electronic pressure control solenoid is faulty, it will need to be replaced. This is a relatively simple fix that can be done by a professional mechanic.

Add transmission fluid

If the transmission fluid level is low, adding more fluid can fix the P0747 code. However, it’s important to find and fix the underlying cause of the low fluid level to prevent future issues.

Repair wiring issues

Repairing or replacing the damaged wiring can fix the issue if the wires are corroded or damaged and that’s what has led to the issue with this code.

Replace PCM

If the PCM is faulty, it will need to be replaced. This is a rare fix that is usually accompanied by other DTCs and symptoms and could lead to replacement costs going up to $1000.

How to prevent the P0747 code

Preventing the P0747 code involves proper maintenance of your vehicle’s transmission. The following are some preventative measures to consider:

• Regularly check the transmission fluid level and add more if necessary.
• Get your vehicle inspected regularly by a professional mechanic.
• Fix any transmission issues as soon as they arise to prevent further damage.

By following these preventative measures, you can reduce the risk of the code appearing in your vehicle.

Our take

The P0747 code can be a sign of a serious issue with your car’s transmission. By understanding the causes, symptoms, and diagnostic methods of this code, you can diagnose and fix the issue before it causes permanent damage.

Make sure to rely on our guidance outlined in this post and also reach out to a trusted mechanic experienced with transmission systems to mitigate the risk.