AutoCodes – GMC – P0315 2017 GMC Sierra

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

Quick Answer

The Crankshaft Position (CKP) system variation learns feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the CKP sensor. Common causes include Crankshaft Position (CKP) system variation learning, Faulty Crankshaft Position, Crankshaft Position sensor harness is open or shorted. 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 Crankshaft Position (CKP) system variation learning, Faulty Crankshaft Position, Crankshaft Position sensor harness is open or shorted.
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.

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Code Popularity 279

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 13, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0315 2017 GMC Sierra Description

The Crankshaft Position (CKP) system variation learns feature is used to calculate reference period errors caused by slight tolerance variations in the crankshaft, and the CKP sensor. The calculated error allows the Engine Control Module (ECM) to accurately compensate for reference period variations. This enhances the ability of the ECM to detect misfire events over a wider range of engine speed and load.
The CKP system variation compensating values are stored in ECM memory after a learning procedure has been performed and the ignition switch is turned to the OFF position for at least 30 seconds. If the actual CKP variation is not within the CKP system variation compensating values stored in the ECM, DTC P0300 may be set.
If the CKP system variation values are not stored in the ECM memory or a proper ECM power-down does not occur after completing the CKP Learn Procedure, DTC P0315 sets.

OBDII Code P0315 2017 GMC Sierra - Crankshaft Position System Variation Not Learned - AutoCodes.com — P0315 2017 GMC Sierra Code - Crankshaft Position System Variation Not Learned

What does this mean?

What are the Possible Causes of the DTC P0315 2017 GMC Sierra?

Crankshaft Position (CKP) system variation learning
Faulty Crankshaft Position
Crankshaft Position sensor harness is open or shorted
Crankshaft Position sensor circuit poor electrical connection

How to Fix the DTC P0315 2017 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0315 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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 itâ€™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.