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P0315 2015 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Quick Answer

The P0315 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the crankshaft position system variation has not been learned by the engine control module (ECM). Common causes include Faulty crankshaft position sensor, Damaged or misaligned tone ring on the crankshaft, Wiring issues. 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 2015 GMC Sierra indicates Crankshaft Position System Variation Not Learned.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged or misaligned tone ring on the crankshaft, Wiring issues.
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 17, 2024
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Code P0315 2015 GMC Sierra Description

The P0315 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates that the crankshaft position system variation has not been learned by the engine control module (ECM). This means that the ECM has not been able to accurately determine the position of the crankshaft in relation to the engine's timing. This can lead to issues with engine performance, fuel efficiency, and overall drivability of the vehicle.

OBDII Code P0315 2015 GMC Sierra - Crankshaft Position System Variation Not Learned
P0315 2015 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Common Causes of P0315 2015 GMC Sierra

  1. Faulty crankshaft position sensor
  2. Damaged or misaligned tone ring on the crankshaft
  3. Wiring issues
  4. Malfunctioning ECM

Symptoms of P0315 2015 GMC Sierra

  1. Engine misfires
  2. Rough idling
  3. Stalling
  4. Poor acceleration
  5. Difficulty starting the engine

How to Fix P0315 2015 GMC Sierra

  1. Diagnose the root cause of the issue using a scan tool.
  2. Test the crankshaft position sensor for proper operation.
  3. Inspect the tone ring on the crankshaft for damage or misalignment.
  4. Check the wiring for any faults or damage.
  5. Relearn the crankshaft position system variation using a scan tool.

Cost to Fix P0315 2015 GMC Sierra

The typical repair costs for addressing a P0315 code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty crankshaft position sensor can range from $100 to $300, including parts and labor. However, if the issue is related to a damaged tone ring or wiring problems, the cost may be higher due to the additional labor involved in diagnosing and repairing these components. It is recommended to consult with a qualified mechanic to get an accurate estimate based on the specific circumstances of your vehicle. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check local rates for a more precise estimate.

What does this mean?

Tech Notes for P0315 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P0315 mean on a 2015 GMC Sierra?

P0315 indicates that the crankshaft position system variation has not been learned by the engine control module (ECM), often due to a missing or incomplete crankshaft position relearn procedure.

2. What are the symptoms of code P0315 on a 2015 GMC Sierra?

Common symptoms include a check engine light, rough idling, poor acceleration, reduced engine performance, and, in some cases, stalling.

3. What causes code P0315 on a 2015 GMC Sierra?

This code is typically caused by a failure to perform the crankshaft position variation relearn after repairs like replacing the crankshaft position sensor, ECM, or engine components such as the flywheel or harmonic balancer.

4. How do I fix the P0315 code on my 2015 GMC Sierra?

The most common fix is performing the crankshaft position variation relearn procedure using a compatible scan tool. Ensure all related components, such as the crankshaft position sensor, are functioning properly.

5. Do I need a scan tool to fix P0315 on a GMC Sierra?

Yes, a scan tool with the capability to perform a crankshaft position variation relearn is required to resolve this code.

6. Can a faulty crankshaft position sensor cause code P0315?

Yes, a malfunctioning or improperly installed crankshaft position sensor can prevent the ECM from learning the crankshaft position variation, triggering the P0315 code.

7. Is it safe to drive a 2015 GMC Sierra with code P0315?

While the vehicle may still be drivable, you may experience reduced performance or stalling. It is best to address the issue promptly to avoid further engine problems.

8. What should I check before performing a crankshaft relearn?

Ensure all engine components are properly installed, no engine misfires are present, and the crankshaft position sensor and related wiring are in good condition.

9. How much does it cost to fix P0315 on a 2015 GMC Sierra?

The cost depends on the root cause. Performing a crankshaft relearn procedure typically costs between $50 to $150 at a repair shop. If parts like the crankshaft sensor need replacement, costs may increase.

10. What happens if I ignore code P0315 on my GMC Sierra?

Ignoring this code can lead to continued poor engine performance, increased fuel consumption, and potential damage to other engine components over time.

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