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Code P0344. Camshaft Position Sensor Circuit A Intermittent

Are you facing starting and ignition problems, or throttle failures? Do you notice a drop in fuel efficiency and constant engine stalling? Did the Check Engine light come on? You may have activated a code P0344.

This code is activated when you have a problem with the electrical circuit that controls the position of the camshaft, more specifically, the CMP sensor.

Let’s see below what this code consists of.

CMP Sensor Operation

Camshaft position sensor (CMP)measures the exact rotational position of the camshaft in relation to the crankshaft.

This provides a critical data signal used by the powertrain control module (PCM) to control ignition spark and fuel injector timing.

The camshaft sensor is also responsible for providing critical data to the variable valve timing system, which increases power and fuel economy while reducing emissions.

When this signal is interrupted for any reason, the P0344 code is set and the Check Engine light illuminates.

As you have seen, the CMP sensor influences the operation of the ignition system, the VVT ​​system, and the fuel injection system and controls the position of the camshaft.

Therefore, a signal failure in this sensor is extremely serious for the operation of the engine and, therefore, the car.

You may also be interested in Code P0340. Causes, Symptoms and Diagnosis

What is Code P0344?

Error Code P0344 is defined as: “Camshaft position sensor circuit A intermittent.” This code means that a signal is missing at one point of the CMP (camshaft position) sensors, which is usually caused by a fault in the electrical circuit.

This is a generic trouble code, which you can see on any vehicle today with the OBD2 diagnostic system. Depending on the make of the car, you may see variations in the definition, but always pointing to the same fault.

The PCM (Powertrain Control Module) uses the CMP sensor to know if the CKP (crankshaft position) sensor signal is correct.

If the CKP position sensor signal is synchronized for cylinder 1, the PCM uses this data for fuel injector and ignition system timing.

Error code P0344 means that the incoming signal from the CMP sensor is interrupted or missing at one point or another when it should not be. This code suggests that there is an intermittent electrical circuit problem.

This code may appear in combination with the related codes P0340 and P0341, which indicate intermittent problems in the electrical circuit with CMP sensors unable to send the signal.

The difference between these three codes is the duration of the problem and the typical electrical problem that causes them in the sensor, circuit or engine controller. Troubleshooting also depends on the manufacturer, CMP sensor type, and wire colors.

Common Symptoms of Code P0344

Error code P0344 can be misleading, as sometimes it may not be preceded by any symptoms other than the Check Engine light. If there are symptoms, they would usually be the following:

  • The engine starts but does not stay on.
  • The engine does not start at all.
  • Loss of engine power.
  • A rattling sound (metallic noise) coming from the engine.
  • Internal detonations in the engine.
  • Poor throttle response due to improper fuel combustion.
  • Increased fuel consumption.
  • Altered power bands due to improper fuel pressure system leading to poor engine timing.

Although some of these symptoms are mild, others make you unable to drive the car. Therefore, you must proceed to diagnose and repair immediately.

Possible Causes of Code P0344

There are many reasons and factors for a vehicle to have this code. Let’s look at the most common ones:

  • CMP power circuit open or intermittent.
  • Short to ground in the power supply circuit to the CMP sensor.
  • Intermittent short to 5V from the signal circuit to the CMP sensor.
  • Intermittent short to ground in the signal circuit to the CMP sensor.
  • Damaged CMP reluctor ring.
  • CKP with problems.
  • Dead or weak battery.
  • Poor electrical wiring connection to the CMP sensor.

How to Diagnose Code P0344

The P0344 code can be correctly diagnosed using an OBD2 scan tool.

  1. You must first collect and collate data from the scan tool to determine when the problem occurred and which codes were activated.
  2. Then erase all the codes and perform an ignition and driving test on the car to check if there is intermittency or the code returns.
  3. Check the condition of the battery with a multimeter. Check its output voltage with the car off. It should be around 12.4 VDC. If the voltage is low, proceed to charge it or change it for a new one.
  4. Check the condition of the camshaft control system wiring. This goes from the sensor to the PCM. You should check for damage, burns, breaks, or bad connections. Repair if necessary. This usually solves the problem.
  5. In case the code is still there, you should check the condition of the CMP sensor, and if it is not beaten, dirty, or damaged in any way. You should also check the reluctor ring. If you find any damage to this assembly, you must proceed to replace it.
  6. If everything is fine so far, you should check the condition of the CKP sensor, and if it is damaged, proceed to replace it.
  7. If at this point, you still have not been able to resolve the fault, you have a high probability of having a problem with the PCM. In this case, it is best to take the car to a trusted specialized service, where they can perform an in-depth diagnosis on the module.

How to Fix Code P0344

Depending on the cause of the error code, there are several ways to fix it, including:

  • Cleaning the electrical connections to the CMP sensor.
  • Replacing the faulty CMP sensor.
  • Replacing the defective CKP sensor.
  • Replacing worn, melted, or damaged wiring.
  • Replacing a weak or dead battery.

The intermittent CMP signal can mean many different problems that can be potentially serious.

If left unchecked for long periods of time, the vehicle will begin to stall and may not restart, or may not start after you turn it off.

Common Errors When Diagnosing Code P0344

Often, in the heat of repair, only the camshaft sensor-related problems and many other components that could be responsible for this code are neglected.

Therefore, other components such as the exhaust system, fuel supply system, wiring, electrical connections, valves, and gaskets should also be examined to prevent the error from recurring.

Making the correct diagnosis is the key.

Is Code P0344 Serious?

The severity of code P0344 depends on the intensity of your symptoms. On some occasions, this code presents very mild, almost non-existent symptoms, and the driver only notices it through the Check Engine light on the dashboard.

Other times, however, the failure presents symptoms of difficult starting, or the engine shuts down and does not start again. They are failures that can eventually leave you stranded.

If this fault occurs in your car, and you can still drive it, we recommend that you do not wait any longer and take your car for repair. If the fault worsens, the repair may cost you more than it might have initially been.

How to Avoid Code P0344?

Sensors, like any other electronic component, have a calculated lifespan. If the signal intermittency is caused by a sensor failure, there is not much you could have done to prevent it. It is part of your car’s spare parts and repair cycle.

What you can avoid is that the code occurs due to wiring problems or poor connections. A routine inspection can verify these faults and proceed to repair before the P0344 code is activated.

Another avoidable failure in this case is that of the battery. A low battery can activate this code, therefore, if you keep your battery up to date, with its terminals clean and without charging problems, you will be able to avoid this code and any other related one.


You may also be interested in Code P0343. Circuit High Input “TO” Camshaft Position Sensor

The activation of code P0344 can be somewhat annoying for the driver due to its symptoms that affect engine performance and driving. Repairing this fault code as soon as possible will allow you to keep your car safe from a possible major, much more expensive fault.

If you can drive your car with this code, we recommend that you do not do so and take your car for repair as soon as possible.

If you want to know other articles similar to Code P0344. Camshaft Position Sensor Circuit A Intermittent you can visit the category Fault Codes.


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