What is OBD-II Code P0315 – Crankshaft Position System Variation Not Learned

What is OBD-II Code P0315 – Crankshaft Position System Variation Not Learned

The OBD-II code P0315, also known as Crankshaft Position System Variation Not Learned, may eventually cross your path if you own a car that operates on an OBD-II system. Cars manufactured from 1996 have an OBD-II system that monitors the car’s functions and reports any detected malfunctions to the vehicle owner via the check engine light.

If you are in the situation where your car is throwing the code P0315, it can be nerve-wracking because you have to figure out what is causing it and what to do next. This article will explore everything there is to know about P0315, from the definition to its repair, and everything in between.

What is OBD-II Code P0315 – Crankshaft Position System Variation Not Learned?

Crankshaft Position System Variation Not Learned is an OBD-II diagnostic trouble code that indicates a problem with the car’s crankshaft sensor. The code is triggered when the sensor cannot tell if the engine’s timing is correct or not. When the code is set, the engine control module (ECM), or the computer system controlling the engine, will assume that the engine’s timing is incorrect.

Like most car problems, P0315 may have several causes that need to be examined before the car owner can pinpoint a precise cause of the code. Some of the causes of P0315 are:

1. Malfunctioning crankshaft sensor or wiring
2. Faulty camshaft sensor or wiring
3. The battery is disconnected, replaced, dead or weak
4. Damage to the main wiring harness, which could be a result of an accident or improper repairs
5. Misfire codes or other driveability codes present.

How to diagnose P0315 code?

To diagnose the P0315 code, a qualified mechanic will use an OBD-II scanner to check the trouble codes stored in your car’s computer. The mechanic will then review the freeze frame data from the code, which captures information such as the engine’s RPM, throttle position, and other vehicle operating parameters at the time the code was triggered.

After reviewing the freeze frame data, the mechanic will proceed to inspect the crank and cam sensors and the wiring harness. If the wires are damaged, the mechanic will replace them, and if the sensors are malfunctioning, the mechanic will replace them as well.

In some cases, the code could be caused by a problem with the engine’s timing or driveability issues. The mechanic will have to perform tests to identify the cause and then replace or repair the faulty system or component.

How to repair P0315 code?

Repair for the P0315 code will vary depending on the underlying problem. Some of the standard repairs for this code include:

1. Replacing the crankshaft sensor
2. Repairing or replacing the wiring harness
3. Installing a new battery if necessary
4. Replacing the camshaft sensor
5. Replacing the ECM (rare)

After making the necessary repairs, the mechanic will reset the code, and the check engine light will go off.

Frequently Asked Questions (FAQs)

1. Can I drive with a P0315 code?

It is not advisable to drive with the P0315 code because it is an indicator of a more significant problem, and driving with this light on could cause engine damage.

2. How much does it cost to repair the P0315 code?

The cost of repairs can vary depending on the underlying problem. On average, repairs for this code could cost between $100 and $500.

3. What causes the P0315 code?

The P0315 code is typically triggered by a problem with the car’s crankshaft sensor or wiring.

4. How do I reset the P0315 code?

The P0315 code can only be reset by a mechanic with an OBD-II scanner.

5. Can P0315 cause other problems with my car?

Yes, P0315 indicates that there is an issue with the crankshaft position. If left unaddressed, it could cause other problems with the engine’s performance and potentially lead to more costly repairs.


The P0315 code tells you that something is wrong with your car’s engine, and it should not be ignored. Therefore, it is essential to have a qualified mechanic diagnose and repair the issues causing the code. By now, you should have a better understanding of the meaning of P0315, what causes it, and how to diagnose and repair it. Remember, always prioritize your car’s maintenance and follow the manufacturer’s recommended maintenance schedule.




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