Troubleshooting P0340 Nissan Code: Common Causes and Fixes

If you own a Nissan vehicle and have seen the P0340 Nissan code then it is essential to understand what it means and how to resolve it. The P0340 code specifically indicates a problem with the camshaft position sensor circuit in bank 1. Don’t worry if it sounds complicated – we’ll break it down for you in simple terms In this article, we will explain what the P0340 Nissan code means, discuss its symptoms, guide you through the troubleshooting process, and provide solutions to fix the problem. Let’s dive into it!

What is the P0340 Nissan Code?

The P0340 Nissan code indicates an issue with the camshaft position sensor circuit on Bank 1 of your Nissan vehicle’s engine. The camshaft position sensor is responsible for monitoring the position and speed of the camshaft. This is a vital component in the engine’s combustion process. The engine control module (ECM) uses the information from the sensor to adjust timing and fuel delivery. When the ECM detects a problem with the camshaft position sensor or its circuit, it triggers the P0340 code.

Symptoms of the Nissan P0340 Code

Experiencing the P0340 Nissan code can cause a variety of symptoms that may indicate a problem with the camshaft position sensor circuit. Look out for the following signs:

  1. Engine misfires or runs roughly: You may notice the engine vibrating or hesitating, and it may not operate as smoothly as usual.
  2. Decreased engine performance and power: The vehicle might feel sluggish or struggle to accelerate properly, impacting its overall performance.
  3. The engine may stall or have trouble starting: The engine may unexpectedly shut off or face difficulty starting, requiring multiple attempts before it runs.
  4. Illuminated check engine light (CEL): The P0340 code triggers the check engine light on your dashboard, alerting you to a potential issue.
  5. Lack of responsiveness in the accelerator pedal: When you press the accelerator pedal, the engine may not respond promptly or as expected.

Troubleshooting the P0340 Nissan Code

Now that we understand the symptoms, let’s explore the steps to troubleshoot and diagnose the P0340 Nissan code. Remember, if you are not comfortable performing these steps yourself, you can always consult a professional mechanic.

Step 1: Check the camshaft position sensor connections

Start by inspecting the connections of the camshaft position sensor. Ensure it is securely connected and there are no loose or damaged wires. Reconnecting or repairing any faulty connections can often resolve the issue.

Step 2: Inspect the wiring harness

Thoroughly examine the wiring harness connected to the camshaft position sensor. Look for any visible signs of damage, such as frayed wires or breaks. If you spot any issues, repair or replace the damaged sections of the wiring harness.

Step 3: Test the camshaft position sensor

Using a multimeter or a specialized diagnostic tool, you can test the camshaft position sensor for proper voltage and resistance readings. Compare these readings to the manufacturer’s specifications to determine if the sensor is functioning correctly. If the readings are out of range, consider replacing the sensor.

Step 4: Check the engine control module (ECM)

If the above steps don’t resolve the issue, it’s worth checking the ECM. This step typically requires professional equipment or expertise. A mechanic or dealership can scan the ECM for any error codes or malfunctions, helping identify if it’s the source of the problem.

Common Causes of the P0340 Nissan Code

To gain a better understanding, let’s look at the common causes of the P0340 Nissan code:

  1. Faulty camshaft position sensor: Over time, the camshaft position sensor can wear out or fail, resulting in inaccurate readings and triggering the P0340 code. Replacing the sensor usually resolves the issue.
  2. Wiring or connection issues: Damaged wiring, loose connections, or corroded terminals can interrupt the signal from the camshaft position sensor, causing the code to appear. Repairing or replacing the affected wiring can often fix the problem.
  3. Malfunctioning engine control module (ECM): In some cases, the ECM itself may be malfunctioning, misinterpreting the signals from the camshaft position sensor and triggering the P0340 code. Replacing the ECM might be necessary if this is the cause.

How to Fix the P0340 Nissan Code

P0340 Nissan Code
image Source: Google, The design of sensors can vary depending on the specific model and year

Now, let’s explore the potential solutions to fix the P0340 Nissan code:

Fix 1: Replace the camshaft position sensor

If the sensor is found to be faulty during the troubleshooting process, replacing it with a new one is usually the best course of action. Ensure you use an original equipment manufacturer (OEM) sensor or a high-quality aftermarket sensor to ensure optimal performance.

Fix 2: Repair or replace the wiring harness

Suppose you find any issues with the wiring or connections during your inspection. In that case, it’s crucial to repair or replace the affected sections of the wiring harness. This will restore the proper connection and ensure accurate readings from the camshaft position sensor.

Fix 3: Replace the engine control module (ECM)

If all other potential causes have been eliminated, and the ECM is determined to be the culprit, it may be necessary to replace it. This step often requires the expertise of a professional mechanic or a visit to a Nissan dealership.

What is the Cost to Diagnose the Code P0340 Nissan?

The cost to diagnose the P0340 Nissan code can vary. DIY diagnosis is free if you have an OBD-II scanner. Professional diagnostic scans range from $50 to $150. Additional diagnostics and repair costs will depend on the specific issue. It’s best to obtain quotes from multiple service providers. Regular maintenance and prompt repairs can help prevent further damage.


How can I diagnose the P0340 Nissan code?

You can diagnose the code by checking the camshaft position sensor connections, inspecting the wiring harness, testing the sensor, and scanning the engine control module (ECM) for any error codes or malfunctions.

Can I fix the P0340 Nissan code myself?

Depending on your mechanical skills, you may be able to fix the issue yourself. Solutions can include replacing the camshaft position sensor, repairing or replacing the wiring harness, or replacing the ECM. However, it’s advisable to consult a professional if you’re unsure or uncomfortable with the process.

Can I still drive my vehicle with the P0340 Nissan code?

It’s generally not recommended to drive with the code unresolved, as it can affect engine performance and potentially lead to further damage. It is better to solve the problem immediately to avoid possible complications.

Will resetting the check engine light resolve the P0340 Nissan code?

Resetting the check engine light will turn off the light temporarily, but it won’t fix the underlying issue causing the code. The code may reappear if the problem remains unresolved.

How can I prevent the P0340 Nissan code from occurring?

Regular vehicle maintenance, including timely replacement of sensors, proper wiring inspections, and addressing any ECM issues, can help prevent the occurrence of the P0340 Nissan code.


Dealing with the P0340 Nissan code can be frustrating, but with the information provided in this article, you should now have a better understanding of what it means and how to address it. By recognizing the symptoms, following the troubleshooting steps, and considering the common causes and fixes, you can effectively diagnose and resolve the issue. If you’re unsure or uncomfortable performing the steps yourself, don’t hesitate to seek assistance from a professional mechanic or dealership. Restoring your Nissan vehicle’s performance is just a few steps away!