AutoCodes – GMC – P0315 GMC

P0315 GMC 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 GMC 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 18,840

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
Comments
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Code P0315 GMC 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 GMC - Crankshaft Position System Variation Not Learned - AutoCodes.com — P0315 GMC Code - Crankshaft Position System Variation Not Learned

What does this mean?

What are the Possible Causes of the DTC P0315 GMC?

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 GMC?

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 GMC 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.

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Information for Specific GMC Models

P0315 2014 GMC Sierra — Crankshaft Position System Variation Not Learned
P0315 2015 GMC Sierra — Crankshaft Position System Variation Not Learned
P0315 2016 GMC Sierra — Crankshaft Position System Variation Not Learned
P0315 2017 GMC Sierra — Crankshaft Position System Variation Not Learned
P0315 2018 GMC Sierra — Crankshaft Position System Variation Not Learned

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.