P0340 – A Camshaft Position Sensor Or Something More Serious?

P0340 – A Camshaft Position Sensor Or Something More Serious?

Are you having trouble starting your car? It keeps cranking and cranking until eventually stops? You diagnosed it and you get the P0340 code? Well, if this is the case and you are having this problem, then you are at the right place because there will be a lot to cover on this topic where we will learn how to tackle this issue.

Having a problem like this can be really frustrating to deal with. Why I’m saying this? Well, I’m saying it because there will be difficulties with the car working in optimal conditions whenever you have a problem like this. There will be big trouble with starting as well as keeping the engine running properly.

But what is causing all of this? We will get to that in a bit when we cover the problem. The first thing you need to learn is troubleshooting and diagnosing problems. Especially for those who are not into cars and do not know what are the basics of this practice. We will start from that and then build up on that knowledge until we sort out the issue.

First, we will learn more about car diagnostics and what you will need to pull this off. Then we will cover the code P340 Ford and learn more about it and if it’s really serious. Then we will cover the causes why is it happening and what are the main symptoms concerning it. Later on, we will cover the diagnostic process and how to sort it out quickly and effectively. So, if you want to learn more, follow along.

P0340 Camshaft Position Sensor

Now before we start elaborating on the problem with the P0340 Toyota code, let’s get some grasp of the basics and learn more about what car diagnostics is in general and why it is important for you to know how it’s done. If you feel like you are well prepared, you can jump to the problem itself, if not, keep up with us for a bit.

Car diagnostics is essential nowadays. You just have to know how it’s done if you don’t want to end up ripped off by mechanics. You need to be your own mechanic. This way you will save a ton of money in the long run. And I really mean it.

Especially if it’s something this simple such as the P0340 Nissan code. Knowing how this work is done will save you hundreds of dollars. Money that you can spend on something more fulfilling. And for this job, you will only need an OBD2 scanner.

A special tool that you can purchase for less than $50. This is one of the best investments that you can make in your career as a self-taught mechanic. In addition to this, having a multimeter is also very essential when bench testing certain components and sensors that run electricity through them. Knowing these two tools and understanding how they work will set you aside from the competition.

And you can also make some money out of it when you become really good at it. Now let’s stick to our problem. Which is the P0340 Nissan code. And more on that in the following chapter.

P0340 Camshaft Position Sensor A Circuit Bank 1

Now as we covered the basics of car diagnostics and we learned what tools you will be needing in order to troubleshoot an issue on your car. Let’s now focus on the problem which in our case is the P0340 camshaft position sensor.

What does this code P0340 represent and how serious is it? Well, when it comes to this problem. We can tell you that the long name of this code is P0340 camshaft position sensor circuit bank 1. But what does this mean?

Well, let’s assume that you probably have an engine in a V configuration, V6, V8, or V12. This means that the camshaft position sensor on the first bank has some kind of malfunction to it.

Either the sensor is broken or there is some malfunction in the electrical circuit. It could be the connectors that have problems and they had shortened out or do not have proper contact. Anything is possible. That’s why in one of the following chapters we are going to discuss the causes for the P0340 camshaft position sensor circuit bank 1.

What is important for you is to treat this problem seriously. This is not a simple problem that will require a simple solution but a problem that has to be understood seriously and then solved accordingly. Why I’m saying this?

Well, because you could be impaired and not be able to start your car. You could end up stranded somewhere on the side of the road and be needing to call a tow to pick you up. That’s why you need to learn the causes for the P0340 camshaft position sensor and that’s what we are going to cover in the following chapters.

Causes For This P0340 Nissan Code

Now as we mentioned, let’s focus on the causes for the P0340 camshaft position sensor circuit bank 1. What could be the causes of this problem?

Knowing these causes will help you diagnose and sort out the problem a lot easier than you previously anticipated because you could know what could be the culprit. Now, let’s dive into the causes and elaborate on them in-depth and learn what could really go wrong and make your car develop this issue.

1. Defective Camshaft Position Sensor

The number one cause for the P0340 Nissan code is a defect in the camshaft position sensor. Sensors are electronic devices that work and measure values. Like in our case with the position of the camshaft.

This sensor is observing the position of the camshaft and together with the crankshaft position sensor, they determine if the timing of the engine is good or not.

What happens in this case when the sensor breaks is that the engine’s ECM does not get the right readings of the camshaft anymore and could throw an error code like in our case with the P0340 Ford F150. This code means that there is a problem and this problem needs solving.

In most cases, a replacement of this sensor will sort out the problem. But there could be some other things as well that can make this problem occur. And that’s what we are going to cover up next.

2. Damaged Or Dirty Ring On The Camshaft

The second symptom that we are going to cover when we are dealing with a P0340 Ford F150 code is the situation when the ring that is located around the camshaft is dirty or damaged.

This ring is also known as reluctor ring. This ring basically serves the purpose of allowing the sensor to get the right reading.

If the ring is broken, then there will be problems with the sensor because it will not get the right readings from it.

Once the sensor gets the wrong information, you will not be able to start the car or there will be continuously cranking until the car starts. Not an ideal situation, to be honest. This is why you need to make sure that you sort out the problem as soon as possible. But how you can diagnose a P0340 code we are going to explain later in the article.

3. Corroded or Damaged Camshaft Position Sensor Wiring Or Connector

Now let’s cover the third most common cause for a P0340 Dodge code which is the damage to the connector or the wiring of the camshaft position sensor.

That word circuit in the diagnostics code details explains that there could be a problem inside the electrical circuit of this sensor.

This could be attributed to rust development on the connectors. As well as damaged wiring. Especially if the cables are worn out they can lose their insulation and come into contact and short out. This is why you need to inspect these aspects as well before you deem the sensor to be broken and need replacement.

4. A Bad Crankshaft Position Sensor

The fourth most probable reason for a P0340 Dodge code is the crankshaft position sensor. Wait a minute? How the crankshaft position sensor could cause this problem?

Well, it could. Mainly because these sensors are constantly monitoring the position of the crankshaft and the camshaft. If these components do not have the right timing, there could be a code on both of these sensors that you are going to notice.

So, whenever you see a code on one of these sensors, it is often useful to check the other one as well. Because this could be a consequence of the other sensor.

5. Bad Engine Timing Components

Bad timing components can also cause the P340 Nissan Pathfinder code. Why is this the case? Well, this is the case because these components could mess up the whole timing of the engine and ruin the performance of the engine.

So, if you had not replaced the timing belt on time or the pulleys and tensioner, then you could face a problem like this one.

Even a worn-out camshaft could cause this problem quite often. This is why everything needs to be checked and you need to determine if you have a problem with these components first before you jump into replacing the camshaft position sensor and repairing the P0340 Nissan Pathfinder code. Now let’s move to the last probable cause.

6. ECM/PCM Problems

The last thing that we would like to discuss when it comes to this P0340 code is a problem with the ECM. Also known as an engine control module. This module can fail and cause problems like this. So, if everything is working well, you might be wanting to check this module and see if it is any good.

Symptoms Of P0340 Code

Now as we cleared the causes for this P0340 code, let’s now clear out the symptoms that there will be noted when you are having a problem with the camshaft position sensor.

Knowing the symptoms will help you when it comes to diagnosing the problem since you will already be familiar with the possibilities that you will face. Now let’s get into the symptoms.

1. Check Engine Light

As you probably assume, the most common symptom associated with the P0340 code is probably the check engine light.


This is the first step in diagnosing the problem. If you don’t get an OBD2 tool, you will never know what could be the cause of this light. But luckily for you, there are other more obvious symptoms associated with this problem that could help you diagnose the matter even without a fancy scanner tool. Now let’s cover them in detail.

2. Car Continuously Cranking

The most common symptom associated with a bad camshaft position sensor and the P0340 Chevy code is the situation when your car doesn’t like to start from the first try.

Whenever this sensor is bad, you will have to continuously crank the car over and over again until it eventually starts. And this can be really detrimental to your battery. The more you crank the car the more stress you put on the starter motor and the battery.

That’s why it is advised to check the camshaft and crankshaft position sensors when you have an issue like this. Because one of the possibilities is that you have a P0340 trouble code as well.

3. Car Is Stalling

The second most common symptom associated with the code P0340 is the situation when the engine of the car is stalling.

Imagine that you drive your car down the road and the engine simply stalls. Then you try to start the engine and the car keeps cranking many times before it starts again. But eventually, the car will stall once again.


All this leads to two probable causes. Either the camshaft position sensor is bad. Or possibly the crankshaft position sensor is bad. Either way, both of these sensors can fail and cause you trouble like this.

So, you need to make sure that you diagnose the problem and see which sensor is malfunctioning. A P0340 Nissan Frontier code is a simple way to determine that there is a problem with the camshaft position sensor. But more about the diagnostics later on.

4. Rough Engine Work And Misfires

The last symptom of the P0340 code that we would like to cover is the problem when you are experiencing rough engine work and frequent misfires.

Whenever this camshaft position sensor is not performing as it should, it is highly likely that you will experience poor engine work and problems like these. The engine simply will not be happy at all with this type of work.

The sensor will not be able to measure the timing of the engine and the timing could be off. So, misfires are one of the outcomes when you have an engine like this. This is why is of utmost priority to diagnose the problem with the P0340 code and fix the problem permanently. And in the following two chapters, we are going to explain how it is done the right way.

How To Diagnose P0340?

Now let’s learn how to diagnose the P0340 Nissan Frontier code. This problem often happens on this specific model and overall on Nissan vehicles so we decided to separate a specific chapter only for this Nissan model. This will also be useful for the Nissan Pathfinder as well as the Xterra.

Nevertheless, in order to get this problem sorted out, you will need to get an OBD2 scanner tool. You can get these cheaply online on Amazon or at your local parts store. Then scan the car for codes. And if you get the P0340 code, you will probably have to replace the sensor.

But in order to be sure, you need to check the contacts and see if they are not rusted out as well as if the sensor is working correctly. You just don’t want to replace a good sensor on your car. Once you determined that the sensor is bad, replace it and clear the codes, then there will be no more issues.

Now let’s cover another model. More precisely the P0340 Ford F150. Covering this model is also important because of the sheer amount of trucks out there are F-150s. So, this is a must. And this truck has a lot of problems with these types of sensors, especially the 5.4L Triton engine.

The process is similar to the previously described process. You grab an OBD2 scanner tool and scan the truck for codes. See what types of codes you are getting and if there is a code like in our case, remove the sensor and test it out with a multimeter just to be sure about it.

Also, check the connections and see if they are clean and if you have power to the sensor. If everything is good, then you will probably have to replace the sensor only. Just locate the sensor and replace it with a new component. Simple as that. But how much will cost you to sort this problem out? Let’s find out next.

Cost To Fix This Problem

Now as we cleared the diagnostic and the repair process of the P0340 code, let’s cover more on the cost of fixing the issue.

If you do this at a shop, you will highly likely have to pay somewhere in the range of $350 and $550. Namely, because this problem will require diagnostics to be performed on your vehicle and then this component needs to be replaced if faulty. All this cost money. So, you can understand that the repair cost will be rather high. Even though replacing the sensor is not that big of a deal.


If you decide to diagnose and sort out the problem on your own, you will highly likely be paying only for the sensor alone. And this could be in the range of $90 and $200. Which is a rather good deal in my opinion.

But you will also need an OBD2 scanner which usually costs about $50 on average and a multimeter. These tools are a rather good investment for you to have in the long run. You never know what might come up.

Camshaft Position Sensor Error Code P0340: Need-to-Know Facts

  1. P0340 is an error code that indicates a problem with the camshaft position sensor A circuit.
  2. If not addressed, the underlying cause of the code could damage your vehicle’s engine.
  3. The error code can result from issues with the electrical wiring of the circuit attached to the camshaft position sensor.
  4. The camshaft position sensor calculates the camshaft’s position and sends a signal to the PCM, which sets the timing for the ignition and fuel injection systems.
  5. Disruption to the camshaft position sensor’s signal can cause performance issues such as misfires and rough running, among others.
  6. P034X error codes are generic powertrain codes that apply to all vehicles built in 1996 and after.
  7. Symptoms of a P0340 code include a check engine light, hard starts, hesitation or failure to start, rough running, insufficient acceleration, and misfiring.
  8. Causes of a P0340 code can include a failing or defective camshaft position sensor, circuit issues, PCM errors, a damaged reluctor wheel, or internal engine timing component problems.
  9. A P0340 code is serious and should be addressed immediately by a professional mechanic to avoid engine damage and expensive repairs.
  10. Diagnosing and repairing a P0340 code can be difficult and require the expertise of a professional mechanic, who will typically use an OBD scanner tool and perform a variety of checks and repairs, including replacing the camshaft position sensor and reprogramming the PCM.

Conclusion To P0340

In this article, we have covered quite a bit when it comes to the P0340 code. First, we elaborated more on car diagnostics and why it is so essential for you to know it as a car owner. Then we focused on the problem itself.

We have covered both the causes and the symptoms of why this code appears. This problem mostly is caused by the camshaft position sensor which tends to fail and cause a lot of headaches for car owners.

Then we learned how we can diagnose the code and replace this sensor. And normally at what cost this will be available.


Now let’s answer some frequently asked questions.

What Does Code P0340 Mean

This is a diagnostics trouble code that indicates a problem with the electrical circuit of the crankshaft position sensor on bank 1. This could be caused by a faulty sensor, faulty wiring, broken timing components, or a bad ECM module.

What Is Code P0340

This code is a trouble code that indicates that you have a problem with the camshaft position sensor on the first bank of your engine. This bank is the one where cylinder 1 is located. The sensor that is monitoring the position of the camshaft is probably broken and needs to be replaced.

How To Fix Code P0340

Fixing this code is relatively simple. First, you need to diagnose if the sensor is the problem. This will require bench testing the sensor and determining if this component is really the one that is faulty, or the problem comes from the wiring and contacts that can come loose or can get corroded. Once the problem is diagnosed and you determined that the sensor is faulty, you can jump in and replace it.

P0340 Camshaft Position Sensor A Circuit Bank 1 Or Single Sensor

There are two sensors if you run a V configuration engine. This faulty sensor is located on bank 1. Meaning that only one bank is affected by the problem.

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