Have you ever gone through the peril of a replaced camshaft position sensor but still get code for it? If your Nissan or Ford was made in the year or after 1996, this problem specifically applies to you. When something goes wrong in the circuit of these cars, the camshaft position sensor generates a powertrain code.
One such code is the P0340 error code. When your automobile triggers such a code, you need to give it immediate attention. Because if you don’t and continue to use it to drive to the office or for short-haul/long-haul trips, the worse it is for the car.
To save you and your car from the trouble, below is a fixing guide featuring 3 methods that you could try to not get the codes. Also, you’ll find a bonus guide on erasing the code, so that they stop coming back! Let’s begin.
What is P0340 Error Code After Replacing Camshaft Position Sensor?
If you didn’t know already, the camshaft sensor is responsible for recording the speed and position of the camshaft when it rotates, as well as for synchronizing the ignition and firing of the coils.
Now, there are different modules inside the car that make use of the camshaft sensor. The Engine Control Module and the Power-train Control Module or PCM are two such users of the sensor.
When the aforementioned reading from the sensor is shady, the injection and ignition spark timing set by the PCM fails. This is when the PCM activates or stores P0340. This is one of the most common codes for a faulty sensor.
There is a similar code to the P0340, which is the P0345. When this code is triggered, the PCM again fails to create the correct injecting and ignition timing. The similarity between them is that both of them warn you that there is a problem with the electric circuit of the sensor.
But the difference is that while the P0345 code comes up when there is incorrect voltage reading, the P0340 comes up when there are issues with the control of the intake and exhaust valves.
Causes of Getting This code After Replacing Camshaft Position Sensor:
There can be many different reasons for which your crankshaft sensor position can go bad and you can get these codes even after you have replaced it. They are as follows:
- The battery has weakened or died.
- Broken connector wire.
- The CKP sensor has gone bad.
- Shorted route circuit.
- PCM itself has broken down.
- The electric connection is bad.
- Electric circuits are open.
- The starter motor is faulty.
- Open or shorted wire harness.
The first thing that you should have checked when you are continually getting codes is the camshaft sensor and have it replaced. Since you have already (hopefully) done it, there are other things that you should check for. They are as follows:
- Check all the different wiring and connectors of the route circuit.
- Examine the stability of the wiring and the connector.
- Check the circuit of the camshaft sensor.
- Examine the voltage of the CKP sensor.
- Diagnose the PCM.
In the following steps, you will learn how to fix it if you are getting the P0340 code as well as the P0345 code even after you have replaced the camshaft sensor.
For the P0340 code, you can try either one of the first two methods, and for the P0345 code, you can try the third method.
While checking all the wiring, here is what you can do in your first attempt to successfully fix the P0340 code:
- First, you have to check the connections in all the cables of the battery. The connections should not only be secure but also clean. Most people check that the connections are tight, but checking for the accumulation of dirt and debris in them is also important. This ensures that the battery is sending a stable feed of current to the modules and the computer.
- Open the hood of the car. Locate the relay center as well as the fuse box. Now, check them for disconnected or loose wires. One important thing that you should keep in mind while checking the fuse box, is that there should be no melted plastic present anywhere. This can lead to a fire hazard and is often responsible for the P0340 code.
- If the wires are all correct and none of them are rubbed through, the problem is no longer with the wiring. This is when you have to switch to the sensor that you replaced and the modules.
- For the CKP sensor, replacing that would require a lot of technical skills that only car mechanics can boast of. Trying to run this test for the CKP sensor yourself at home can be costly. So you can take your car to professional service centers.
- For module checking and installation, your car needs a thorough diagnosis. Although this will fix your problem, this needs to be done by well-trained personnel and hence should again mean that you need to visit a professional.
While checking all the wiring, here is a more detailed guide to what you can do in your second attempt to successfully fix the P0340 code:
- In this step, you will check all the wiring as you were advised in method 1A of getting the error code.
- Now, you will need a multimeter to check the signals, ground, and voltage readings of your CKP sensor. If you find an issue with the sensor that cannot give you a signal or voltage reading, then you have to remove the sensor.
- After removing the sensor, find if any damage has happened to the reluctor ring. If all is good and there is no misalignment, place the crankshaft position sensor back in its place.
- Try steps 2 and 3 on your camshaft position sensor. If you find any issue here, simply replace the camshaft position sensor and the error code will be fixed.
- Suppose both the crankshaft and the camshaft position sensors are alright, then what can you do to not get codes? Now, it is time to run a continuity test with both of them and the engine control module. If you find any fault here, the ECM needs repair.
- If you are seeing other codes besides the P0340 even after replacing the camshaft, the crankshaft, and fixing the ECM, check for other error/trouble codes on the computer and make necessary repairs. Often, other relevant codes may be the source of the P0340, causing the latter code to show up.
- If all steps 1-6 did not resolve your engine-dashboard-lit-up issue, the problem may be more serious, with damage in the timing counterparts in the ECM or the need for a software security update. In that case, you need to go for a professional repair to have your engine-dashboard-lit-up issue to be resolved.
Trying to work with the P0345 code is much like method 1B. All you need to do here is as follows:
- Conduct steps 1-5 of method 1B.
- In step 5 of 1B, instead of looking at the ECM 9or besides that), figure out and diagnose problems with the PCM and replace it.
- Continue with steps 6 and 7 to solve the getting of codes.
As you learned, if you have replaced camshaft position sensor but still get a code, there are simple ways to detect and resolve the problem. All you have to do is make sure that the wiring and connectors are secure, not open, not grounded, and not loose.
Also, you have to check for dirt in the wiring and fuse box and keep them clean. And as for the replacement, if replacing the camshaft sensor still gives you codes, you should repair the camshaft position sensor, as well as the ECM and PCM. While you can do the checking by yourself, it is always better to take the bigger steps of resetting and fixing by a professional who has access to the right diagnostic tools and advanced scanners to stop and erase the codes permanently for you.