Mastering the P0315 Relearn Procedure: A Comprehensive Guide

You must carry out the P0315 relearn operation after replacing or repairing a crankshaft position (CKP) sensor. When data gathered by CKP is present but not stored in the powertrain control module PCM’s memory, the P0315 DTC appears. Therefore, P0315 relearn refers to the relearn procedure for CKP sensors.

Being a tech-savvy guy, you identified the problem and replaced your defective crankshaft position sensor when you noticed the P0315 DTC (diagnostic trouble code) on the OBD scanner. You discover you need to go through a relearning method because you are still not receiving the desired outcome.

What Exactly Is The P0315 Relearn Procedure?

Regardless of whether you have a scanner or not, we will walk you through every step of the relearn process. Let’s get started because it is a rather easy process.

What Does the Error Code P0315 Relearn Mean?

Relearning the crankshaft position sensor is indicated by the code P0315. This DTC code appears because the crankshaft position mechanism is malfunctioning. A crankshaft replacement is followed by a relearn operation.

Your scanner will display the general DTC number P0315, which stands for “Crankshaft Position System Variation Not Learned.” This sensor transmits data to the PCM while keeping track of the crankshaft’s rotation. (0)

The relearning process may be different for each engine. Verify whether the CKP sensor can be relearned using the code reader or scanner you are using.

How to Use a Scanner to Relearn P0315?

P0315 Relearn Procedure
Scanner Tool

The length of the relearn procedure varies on the car and the scanner you’re using. If you have a rudimentary understanding of mechanics, you can complete the procedure on your own. Relearn method P0315 can take up to an hour. (A Complete Guide on choosing the best Scanner)

P0315 Relearn Procedure for GM Vehicles

In light of this, all GM vehicles, including Chevy, require this relearn procedure.

Step 1: Connect the scanning device to the Data Link Connector (DLC) under the dash. Make sure the hood is closed, block the wheels, and engage the parking brake.

Step 2: Put the automatic transmission in park mode in step two. Put your manual transmission in neutral if you have one.

Step 3: Start the engine and check that it is 158°F working temperature.

Step 4: Press the brake pedal and maintain it. Then on the scan tool, choose and enable the Crankshaft Variation Relearn Procedure (CASE learn).

Step 5: Now gradually increase the engine’s speed to 4,000 rpm (or the recommended rpm for your engine). Keep the engine running at this rpm until the speed returns to idle. Release the throttle as soon as the relearning process is complete. A successful relearn will be displayed by the scan tool.

[Note: Typically, the RPM cutoff number for inline 4-cylinder GM vehicles is 3970 RPM, and for V8 engines, it is 4000 RPM. The cutoff value for a V6 in a GM passenger car is 5150 RPM, however it is 4000 RPM for light-duty trucks.]

Step 6: Exit the vehicle for at least 15 seconds. Remove the scanner’s cable. Another error number, DTC P1336, will show up if the relearn operation fails.

Step 7: A manufacturer-specific error code equivalent to P0315 is DTC P1336. Ensure that the CKP protocol was thoroughly followed if DTC P1336 is present. Consult a mechanic if this does not work.

Ford P0315 Relearn Procedure

On a Ford vehicle, this relearn procedure is carried out with an HP tuner. Ensure that the engine is running at 176°F.

Step 1: Start the scanner after connecting the HP tuner to your car.

Step 2: Check the scanner’s DTC menu and erase all error codes.

Step 3: Select the scanner’s input-output menu. Select the crank relearn procedure after that. As long as the transmission is in park or neutral, make sure the parking brake is engaged.

Step 4: Turn on the ignition and wait a while. Next, accelerate to 4500 RPM.

The scanner will show “Crank relearn successful” on step five. Turn off your engine and unplug the tuner.

Common P0315 Relearn Procedure

The general crankshaft relearning process is comparable to the ones described above, with the exception that there will be some little variations across models. Additionally, engine oil and coolant operating temperatures will vary from vehicle to vehicle. Other than that, each step is comparable.

Checking the amount of your engine coolant and oil is a usual precaution before performing this process. Check the RPM cutoff value for your car at the same time. You must not accelerate past the prescribed cutoff value.

The relearn should be done as follows:

Connect a scanner to ensure sure the computer’s memory does not contain any error codes.

A power train failure code other than P1336 or P0315 (Crankshaft Position Variation not learnt) will cause the computer to disable relearn until the underlying issue has been resolved.

Additionally, confirm that the oil and engine coolant levels are appropriate (check them when the engine is cold).

  1. Block the drive wheels and engage the parking brake. Make that the hood is shut.
  2. Before starting the engine, check that the engine coolant is at least 158 degrees Fahrenheit (70 degrees Celsius).
  3. Shut down the car’s engine for at least 10 seconds.
  4. On your scanner, choose the CASE Learn technique for learning about crankshaft position variance.
  5. Verify that the transmission is in the Park position. Start the car.
  6. Apply the brakes and firmly press the pedal.
  7. Comply with the scanner’s guidelines.

Keep in mind: You’ll be increasing the engine speed to roughly 3000, 4000, or 5150 RPM. Depending on the engine, that is the variation in fuel cutoff RPM. It is crucial to let off the gas when the engine RPM starts to drop as a result of the fuel cutoff taking effect. Failure to do so will cause the engine to over revving, perhaps damaging it.

  1. Verify the status of Diagnostic problem code P1336 or P0315 when the engine has resumed idling. The relearn procedure is finished if the scanner shows that the CASE has been learned. Check for the presence of other power train codes if CASE has not been learned. If any, fix the issue before repeating this process.

P0315 Relearning Procedure without a Scan Tool:

Use this technique if your scanner does not have a relearn feature.

Here’s how to retrain a crankshaft without a scanner.

Is P0315 Relearning Important?

Yes, you must relearn P0315 after changing the crankshaft position sensor. This DTC typically appears as a result of a CKP sensor failure. Electrical problems with the sensor, such as burned connectors and damaged wire, lead it to malfunction.

What Happens If P0315 Ignored?

Your car will run badly or perhaps enter limp mode if you ignore P0315. Running the car while it has this DTC code will result in stalling, harsh idling, backfiring, and misfiring of the engine. Your fuel usage will increase at the same time.

Frequently Asked Questions:

What happens if you don’t do a camshaft relearn?

In high RPM/load conditions, the engine may misfire or undergo “reduced power” or “limp mode.” Additionally, skipping the relearn procedure could result in the vehicle failing the emissions test because the misfire monitor is either insufficient or inoperative. Find more detail.

What is relearn mode?

The electronic coupling of a new TPMS sensor with the tire pressure monitoring system of the vehicle is referred to as relearn mode. Every time a new TPMS sensor or sensors are installed, the TPMS must be relearned.

What does OBD relearn mean?

To write (Relearn) the sensor IDs to the vehicle’s ECU, a TPMS tool must be connected to the OBD port of the vehicle. The majority of cars built in Japan and Korea as well as those by Chrysler, Fiat, Land Rover, and Jaguar typically use this process.

What are the three types of relearn procedures?

The three different relearn techniques are OBD, stationary (manual), and auto relearn. Certain cars might combine two or more relearn types.


About The Author

Avatar for Ibrar Ayyub

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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