How to fix P0315 obd2 codes? (System Variation Not Learned)

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Steps to Diagnose and fix Code P0315
Table of Contents

P0315 is a trouble code indicating that Crankshaft Position System variation has not been learned. The code pops up when the Powertrain Control Module sees that there is a variation between the actual value and the value stored in the crankshaft position reference points.

The point exceeds the limit so the computer detects and throws this error code.

What exactly does P0315 means?

The error code P0315 is related to the relationship between the Crankshaft Position Sensor and Power Train Control Module. The computer present in the vehicle measures the value or reference points between the Crankshaft Position Sensor and the value already stored in the Power Train Control Module.

What exactly P0315 means?

If after the comparison the computer sees data that is higher than the calibrated percentage then this code P0344 is established. The problem mainly points to the electrical circuit but there can be other reasons as well.

OBD-II Code P0315: Symptoms, Causes & Diagnose

The real causes of the P0315 code 

The P0315 code can appear due to several causes that are the following:

  • The wiring around the crankshaft position sensor is faulty
  • crankshaft position sensor got defected 
  • The crankshaft is flawed
  • The timing belt is broken
  • The powertrain control module is not working properly
  • The sensor connected defects 
  • The sync components are damaged
  • CKP sensor got an open earth circuit
  • The battery is disconnected without memory saving device
  • The wiring that connects the crankshaft position sensor and PCM is either burnt or disconnected 
  • Reprogramming the powertrain control module with outdated software 
  • The replaced crankshaft position sensor is unstable. 
  • Incorrect installation of the various components 

Symptoms of P0315 obd2 code

The common symptoms associated with the code P0315 are the following:

  • The check engine light illuminates
  • There is misfiring 
  • The engine starts but it shuts down immediately. 

The symptoms of the P0315 code appear according to the root cause of the problem. (FIXES P0414) If there is some electrical cause then check engine oil will be indicated as well as fuel will also drop. There will be some mechanical issues as well and in this case, the engine will not perform properly.

Steps to Diagnose and fix Code P0315

Tools required to fix Code P0344

You will need different tools to fix code P0344 which are the following:

  • Scan tool

How to start diagnosing error code P0344

Steps to Diagnose and fix Code P0315

Step 1: In diagnosis, the good way is to first look for technical service bulletins according to the vehicle. The issue may be known and it will save plenty of your time plus money.

Step 2: If you have a scan tool then start scanning the vehicle for the code P0315. Now clear all the codes and check whether the code still exists or not. If the problem resolves here then it means that code P0315 was intermittent and it has gone. 

Step 3: If the code appears again then it means that you need to further inspect the engine. Locate the Crankshaft Position Sensor on your particular vehicle and start looking for the wires, chafing, rubbing, or 

anything that can damage the vehicle. Now examine all the terminals by taking connectors apart. If you see any change in their color or something then clean them. They can be burnt or corroded. The right way is to clean them by using an Electrical Contact cleaner and a plastic bristle brush. In case you are lacking tools then a normal toothbrush can also serve the purpose. Now clear the codes from the memory and see if they appear again or not.

Step 4: The Crankshaft Position Sensor will be removed if the code remains there. Look closely at the sensor as well as the components related to it. Pay attention to the point where it gets connected to the timing component in the engine. Is that working properly? If you feel that there is any damage then replace them as well. 

Always remember that the quality of the replaced part matters a lot as bad quality components will increase issues for you later. As the Crankshaft Position Sensor is removed slowly turn on the engine to see whether the timing chain shows slack. If you are not sure then install a new CPS sensor to your vehicle and test. 

After applying all the new parts you need to reset the code to test whether it has gone or not. In most cases, the code disappears after the proper installation of the mentioned parts or cleaning of the components. 

If the code still appears then it is high time to see where you went wrong during the process. You need to examine everything again from the start.

Common Code P0315 Diagnosis Mistakes

This code can cause mechanical or electrical issues so the most common mistake is mixing these two. This mistake can be deadly if the exact point is not detected. It can also result in replacing unnecessary parts.  

Replace/Repair These Parts To Fix OBD Code P0315 

The main areas that should be repaired are below.

Crankshaft position sensor

If the problem lies in the crankshaft position sensor then replace it to fix the defect. 


Sometimes the wiring of the crankshaft position sensor is burnet so changing it will also fix the problem. 

Related components 

If the crankshaft position sensor and both wiring are correct then look for the related components.

Timing belt

Replace the timing belt if all the remaining points are clear. 

Powertrain control module

Repair or replace the powertrain control module to resolve the code issue if all the above parts are working fine. 

Additional Tip

Sometimes when a broken timing belt is repaired and replaced then the crankshaft position sensor and associated wiring get faulty. It can also result in a P0315 code. 

How serious is the P0315 code?

Never take this code lightly. This code can be considered very dangerous because it can make the engine freeze. No matter how hard you will try it will not start. It also affects the fuel economy and performance negatively. . If the P0315 code pops up then get it fixed immediately from the professional.