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P0315 2014 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Quick Answer

The P0315 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the Crankshaft Position System Variation Not Learned. Common causes include Faulty crankshaft position sensor, Wiring issues or shorts in the crankshaft position sensor circuit, Engine control module (ECM) malfunction. 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 2014 GMC Sierra indicates Crankshaft Position System Variation Not Learned.
Common causes
Common causes include Faulty crankshaft position sensor, Wiring issues or shorts in the crankshaft position sensor circuit, Engine control module (ECM) malfunction.
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 13, 2024
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Code P0315 2014 GMC Sierra Description

The P0315 diagnostic trouble code (DTC) for a 2014 GMC Sierra indicates that the Crankshaft Position System Variation Not Learned. This code typically points to an issue with the crankshaft position sensor or the system's ability to properly learn the variation in the crankshaft position. The crankshaft position sensor is a vital component in the engine management system, as it helps determine the position of the crankshaft in relation to the engine's timing. When the system fails to learn the variation in the crankshaft position, it can lead to poor engine performance, misfires, and potentially even engine stalling.

OBDII Code P0315 2014 GMC Sierra - Crankshaft Position System Variation Not Learned
P0315 2014 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Common Causes of P0315 2014 GMC Sierra

  1. Faulty crankshaft position sensor
  2. Wiring issues or shorts in the crankshaft position sensor circuit
  3. Engine control module (ECM) malfunction
  4. Poor electrical connections
  5. Mechanical issues affecting the crankshaft position

Symptoms of P0315 2014 GMC Sierra

  1. Engine misfires
  2. Rough idling
  3. Reduced fuel efficiency
  4. Hesitation during acceleration
  5. Engine stalling

How to Fix P0315 2014 GMC Sierra

  1. Diagnose the issue by using a scan tool to check for the P0315 code and perform a visual inspection of the crankshaft position sensor and related wiring.
  2. Test the crankshaft position sensor using a multimeter to ensure it is functioning correctly.
  3. Check the wiring and connections for any signs of damage or corrosion, repairing or replacing as necessary.
  4. If the sensor and wiring are in good condition, relearn the crankshaft position variation using a professional scan tool or by following the manufacturer's specific relearn procedure.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0315 2014 GMC Sierra

The typical repair costs for addressing a P0315 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty crankshaft position sensor can cost between $100 and $300, including parts and labor. However, if the issue is related to wiring problems or an ECM malfunction, the repair costs can increase significantly. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. For a more accurate estimate, it's recommended to consult with a local auto repair shop.

What does this mean?

Tech Notes for P0315 2014 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.

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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.

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