P1704 Turbo Charge Relief Circuit Malfunction

How to Diagnose and Solve P1704 Turbo Charge Relief Circuit Malfunction Issues


Are you a car enthusiast who loves to get your hands dirty? Or perhaps you’re a DIYer who enjoys the satisfaction of fixing things yourself? If so, you’re in the right place. Today, we’re going to delve into the world of car diagnostics, specifically focusing on the P1704 Turbo Charge Relief Circuit Malfunction. We’ll guide you through the process of diagnosing and solving this issue, providing you with step-by-step instructions and useful tips. So, let’s get started, shall we?

Understanding the P1704 Code

First things first, what exactly is the P1704 Turbo Charge Relief Circuit Malfunction? In simple terms, this is a diagnostic trouble code (DTC) that indicates a problem with the turbocharger wastegate solenoid ‘A’ circuit. This solenoid controls the amount of boost pressure in the turbocharger, and if it malfunctions, it can lead to a variety of issues, including reduced engine performance and increased fuel consumption.

Common Symptoms

How do you know if your car has a P1704 issue? Here are some common symptoms to look out for:

– Reduced engine power
– Increased fuel consumption
– Check engine light is on
– Turbocharger or supercharger may not work properly

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Diagnosing the P1704 Issue

Now that we’ve covered the basics, let’s move on to the diagnosis. Here’s a step-by-step guide to help you identify the problem.

Step 1: Check the Diagnostic Trouble Codes (DTCs)

The first step in diagnosing a P1704 issue is to check the DTCs. You can do this using an OBD-II scanner, which you can purchase online or at an auto parts store. Simply plug the scanner into the OBD-II port in your car (usually located under the dashboard), and it will display any DTCs.

Step 2: Inspect the Turbocharger Wastegate Solenoid

Next, inspect the turbocharger wastegate solenoid for any visible damage or wear. If it appears to be in poor condition, it may need to be replaced.

Step 3: Test the Turbocharger Wastegate Solenoid

To test the solenoid, you’ll need a multimeter. Set the multimeter to measure resistance, and then connect it to the solenoid. If the resistance is outside the manufacturer’s specifications, the solenoid is likely faulty.

Solving the P1704 Issue

Once you’ve diagnosed the problem, it’s time to fix it. Here’s how:

Step 1: Replace the Turbocharger Wastegate Solenoid

If the solenoid is faulty, it will need to be replaced. This is a relatively straightforward process, but it’s important to follow the manufacturer’s instructions to ensure a proper fit.

Step 2: Clear the DTCs

After replacing the solenoid, clear the DTCs using your OBD-II scanner. This will reset the check engine light and allow you to verify that the problem has been resolved.

Step 3: Test Drive

Finally, take your car for a test drive to ensure that the turbocharger is working properly and that there are no other issues.


Diagnosing and solving a P1704 Turbo Charge Relief Circuit Malfunction issue may seem daunting, but with the right tools and a bit of patience, it’s a task that any DIYer can tackle. Remember, the key is to take your time, follow the steps carefully, and don’t be afraid to ask for help if you need it. Happy fixing!


1. What causes a P1704 Turbo Charge Relief Circuit Malfunction?

This issue is typically caused by a faulty turbocharger wastegate solenoid, but it can also be due to wiring issues or a malfunctioning powertrain control module.

2. Can I drive my car with a P1704 issue?

While it’s possible to drive with this issue, it’s not recommended. The reduced engine performance and increased fuel consumption can lead to other problems down the line.

3. How much does it cost to fix a P1704 issue?

The cost can vary depending on the exact issue and the make and model of your car. However, a new turbocharger wastegate solenoid typically costs between $100 and $200, not including labor.