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P0315 2017 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Quick Answer

The P0315 diagnostic trouble code (DTC) in a 2017 GMC Sierra indicates that the crankshaft position system variation has not been learned by the vehicle's powertrain control module (PCM). Common causes include Faulty crankshaft position sensor, Incorrectly installed or defective timing chain, Issues with the camshaft position sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0315 2017 GMC Sierra indicates Crankshaft Position System Variation Not Learned.
Common causes
Common causes include Faulty crankshaft position sensor, Incorrectly installed or defective timing chain, Issues with the camshaft position sensor.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P0315 2017 GMC Sierra Description

The P0315 diagnostic trouble code (DTC) in a 2017 GMC Sierra indicates that the crankshaft position system variation has not been learned by the vehicle's powertrain control module (PCM). The crankshaft position system variation refers to the relationship between the crankshaft position sensor and the engine's crankshaft. The PCM uses this information to accurately determine the engine's timing and fuel injection strategy.

OBDII Code P0315 2017 GMC Sierra - Crankshaft Position System Variation Not Learned
P0315 2017 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Common Causes of P0315 2017 GMC Sierra

  1. Faulty crankshaft position sensor
  2. Incorrectly installed or defective timing chain
  3. Issues with the camshaft position sensor
  4. Electrical wiring or connection problems related to the crankshaft position system
  5. PCM software issues or programming errors

Symptoms of P0315 2017 GMC Sierra

  1. Engine misfires or rough idling
  2. Reduced engine power or acceleration
  3. Poor fuel efficiency
  4. Difficulty starting the engine
  5. Illumination of the Check Engine Light

How to Fix P0315 2017 GMC Sierra

  1. Begin by performing a thorough inspection of the crankshaft position sensor, wiring, and connections. Replace any damaged or faulty components.
  2. Use a scan tool to reset the PCM and attempt to relearn the crankshaft position system variation.
  3. Check the timing chain for proper installation and tension. Adjust or replace the timing chain if necessary.
  4. Inspect the camshaft position sensor for any defects and replace if needed.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0315 2017 GMC Sierra

The typical repair costs for addressing a P0315 code in a 2017 GMC Sierra can range from $200 to $500, including parts and labor. However, prices may vary depending on the specific diagnosis time and labor rates at auto repair shops. It is recommended to inquire about local rates to obtain a more accurate estimate for this repair.

What does this mean?

Tech Notes for P0315 2017 GMC Sierra

The crankshaft position (CKP) system variation learn procedure is done better with a scan tool, but if the Crankshaft Variation Relearn is not accessible through your scan tool (some truck applications 1998 & later), perform the relearn in the following manner:

1. Turn off all the accessories. With the Air temperature sensor and Coolant temperature within 5 degrees (Centigrade) of each other, start the engine and let it idle in Park or Neutral for two minutes.
2. Accelerate the vehicle to 55 mph at part throttle. Cruise at 55 mph for 8- 10 minutes until the engine reaches operating temperature.
3. Cruise at 55 mph for another 5-6 minutes.
4. Decelerate to 45 mph without braking and maintain 45 mph for 1 minute.
5. Perform 4 deceleration cycles, without using the brakes, of 25 seconds each where no specific speed is necessary. Returning to 45 mph for 15 seconds in between deceleration cycles.
6. Accelerate to 55 mph and cruise for 2 minutes.
7. Stop the vehicle and idle for 2 minutes with the brake applied and the transmission in Drive (automatic trans.) or Neutral (manual trans.) with the clutch depressed.

Need more information about the P0315 2017 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0315 2017 GMC Sierra Code

What does the OBDII code P0315 mean on a 2017 GMC Sierra?

The P0315 code indicates that the Crankshaft Position System Variation has not been learned, meaning the Engine Control Module (ECM) cannot properly monitor crankshaft position variations.

What are the common symptoms of a P0315 code on a 2017 GMC Sierra?

Common symptoms include the check engine light turning on, rough idling, poor acceleration, engine misfires, or reduced fuel efficiency.

What causes the P0315 code on a 2017 GMC Sierra?

This code is often caused by a failed crankshaft position sensor, a recent ECU reset, incomplete crankshaft relearn procedure, or damaged wiring or connectors.

Can I drive my 2017 GMC Sierra with a P0315 code?

While the vehicle may still drive, ignoring this code can lead to performance issues and potential long-term engine damage, so it’s best to address it promptly.

How do you fix the P0315 code on a 2017 GMC Sierra?

Fixes can include performing a crankshaft position variation relearn procedure, inspecting and replacing the crankshaft position sensor, or repairing damaged wiring or connectors.

What is the crankshaft position variation relearn procedure?

This procedure recalibrates the ECM to recognize the crankshaft's position variations and is typically done using a diagnostic scan tool.

Do I need a professional to fix the P0315 code on my 2017 GMC Sierra?

If you have a scan tool and basic automotive knowledge, you may be able to perform the relearn procedure yourself. However, diagnosing sensor or wiring issues may require professional assistance.

Can a dead or disconnected battery cause the P0315 code?

Yes, disconnecting or replacing the battery can reset the ECM and require a crankshaft position relearn procedure to clear the code.

How much does it cost to fix the P0315 code on a 2017 GMC Sierra?

The cost can range from $100 to $300, depending on whether you need a crankshaft relearn procedure, a new crankshaft position sensor, or wiring repairs.

What scan tool is needed to perform the crankshaft relearn procedure for a P0315 code?

A professional-grade scan tool or an advanced OBDII scanner capable of performing bi-directional functions is required for the crankshaft relearn procedure.

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