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P0315 GMC Code - Crankshaft Position System Variation Not Learned

Quick Answer

The P0315 GMC diagnostic trouble code (DTC) indicates that the crankshaft position system variation is not learned. Common causes include Faulty crankshaft position sensor, Incorrect installation of the sensor, Wiring or connector 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 GMC indicates Crankshaft Position System Variation Not Learned.
Common causes
Common causes include Faulty crankshaft position sensor, Incorrect installation of the sensor, Wiring or connector 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 Aug 19, 2024
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Code P0315 GMC Description

The P0315 GMC diagnostic trouble code (DTC) indicates that the crankshaft position system variation is not learned. This means that the engine control module (ECM) has not been able to determine the correct position of the crankshaft in relation to the camshaft, leading to potential timing issues. The crankshaft position sensor is a crucial component that helps the ECM accurately control ignition timing and fuel injection. If this system variation is not learned, it can result in poor engine performance, misfires, reduced fuel efficiency, and potential engine damage if not addressed promptly.

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

Common Causes of P0315 GMC

  1. Faulty crankshaft position sensor
  2. Incorrect installation of the sensor
  3. Wiring or connector issues
  4. ECM software glitches
  5. Timing chain/belt problems

Symptoms of P0315 GMC

  1. Rough idle or stalling
  2. Engine hesitation or lack of power
  3. Check Engine Light illuminated
  4. Engine misfires
  5. Poor fuel economy

How to Fix P0315 GMC

  1. Use an OBD-II scanner to identify the exact cause of the code
  2. Inspect the crankshaft position sensor and related wiring for any damage or loose connections
  3. Replace the crankshaft position sensor if faulty
  4. Perform a crankshaft position variation relearn procedure using a scan tool
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved

Cost to Fix P0315 GMC

The cost of repairing a P0315 GMC code can vary depending on the underlying cause and the labor rates of the repair shop. Typically, replacing a crankshaft position sensor can cost between $100 and $250, including parts and labor. However, additional diagnosis time and potential relearn procedures may increase the overall cost. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your specific vehicle and location.

What does this mean?

Tech Notes for P0315 GMC

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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Information for Specific GMC Models

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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