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P0315 2016 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Quick Answer

The P0315 diagnostic trouble code (DTC) for a 2016 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 reluctor ring, 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 2016 GMC Sierra indicates Crankshaft Position System Variation Not Learned.
Common causes
Common causes include Faulty crankshaft position sensor, Damaged or misaligned reluctor ring, 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 16, 2024
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Code P0315 2016 GMC Sierra Description

The P0315 diagnostic trouble code (DTC) for a 2016 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 properly calibrate and synchronize the crankshaft position sensor with the engine's timing. The crankshaft position sensor is responsible for detecting the position of the crankshaft in relation to the engine's cycle, allowing the ECM to accurately control fuel injection and ignition timing. When the system variation is not learned, it can lead to poor engine performance, misfires, and potential damage to the engine components.

OBDII Code P0315 2016 GMC Sierra - Crankshaft Position System Variation Not Learned
P0315 2016 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Common Causes of P0315 2016 GMC Sierra

  1. Faulty crankshaft position sensor
  2. Damaged or misaligned reluctor ring
  3. Wiring issues
  4. Malfunctioning ECM
  5. Poor electrical connections

Symptoms of P0315 2016 GMC Sierra

  1. Engine misfires
  2. Rough idling
  3. Difficulty starting the engine
  4. Engine stalling
  5. Decreased fuel efficiency

How to Fix P0315 2016 GMC Sierra

  1. Diagnose the root cause of the issue by using a scan tool to check for any related trouble codes and perform a visual inspection of the crankshaft position sensor and wiring.
  2. Replace the faulty crankshaft position sensor if necessary.
  3. Inspect and realign the reluctor ring if it is damaged or misaligned.
  4. Check and repair any wiring issues or poor electrical connections.
  5. Perform a crankshaft position system variation learn procedure using a scan tool to synchronize the crankshaft position sensor with the engine's timing.

Cost to Fix P0315 2016 GMC Sierra

The typical repair costs for addressing a P0315 code on a 2016 GMC Sierra can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnosis time and labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate. Additionally, rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower prices.

What does this mean?

Tech Notes for P0315 2016 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.

Frequently Asked Questions about P0315 2016 GMC Sierra Code

What does the OBDII code P0315 mean on a 2016 GMC Sierra?

1. P0315 indicates that the Crankshaft Position System Variation has not been learned by the vehicle's Engine Control Module (ECM). 2.

What are common symptoms of code P0315 on a 2016 GMC Sierra?

Symptoms may include an illuminated Check Engine Light, rough idling, poor acceleration, or reduced engine performance. 3.

What causes the P0315 code to appear on a 2016 GMC Sierra?

Common causes include a recent engine or crankshaft repair, a dead or disconnected battery, a faulty crankshaft position sensor, or issues with the ECM. 4.

Can I drive my 2016 GMC Sierra with the P0315 code active?

While the vehicle may be drivable, it could experience performance issues. It's best to address the problem promptly to avoid potential engine damage. 5.

How do I fix the P0315 code on a 2016 GMC Sierra?

The issue is typically resolved by performing a crankshaft position variation relearn procedure using a compatible scan tool. 6.

What tools are needed to fix the P0315 code on a 2016 GMC Sierra?

A diagnostic scan tool with relearn capabilities and software compatible with the 2016 GMC Sierra is required. 7.

Can a bad crankshaft position sensor cause the P0315 code?

Yes, a malfunctioning or improperly installed crankshaft position sensor can trigger the P0315 code. 8.

Does the P0315 code always require sensor replacement?

No, the issue often only requires the crankshaft variation relearn procedure. Sensor replacement is only necessary if the sensor is faulty. 9.

What should I do if the P0315 code reappears after a relearn procedure?

If the code returns, inspect the crankshaft position sensor, wiring, and ECM for defects or damage and repair or replace as needed. 10.

How much does it cost to fix the P0315 code on a 2016 GMC Sierra?

The cost varies depending on the repair. A relearn procedure performed at a repair shop typically costs $75–$150, while sensor replacement may cost $200–$400, including parts and labor.

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