Engine-Codes.com
Engine-Codes – GMC – P0315 2018 GMC Sierra

P0315 2018 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Quick Answer

The P0315 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the crankshaft position system variation has not been learned. Common causes include Faulty crankshaft position sensor: A malfunctioning sensor can provide inaccurate data to the ECU, leading to the P0315 code, Timing chain or belt issues: Problems with the timing chain or belt can affect the alignment of the crankshaft and camshaft, causing the code to be triggered, Wiring or connection issues: Poor electrical connections or damaged wiring can disrupt the communication between sensors and the ECU. 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 2018 GMC Sierra indicates Crankshaft Position System Variation Not Learned.
Common causes
Common causes include Faulty crankshaft position sensor: A malfunctioning sensor can provide inaccurate data to the ECU, leading to the P0315 code, Timing chain or belt issues: Problems with the timing chain or belt can affect the alignment of the crankshaft and camshaft, causing the code to be triggered, Wiring or connection issues: Poor electrical connections or damaged wiring can disrupt the communication between sensors and the ECU.
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 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P0315 2018 GMC Sierra Description

The P0315 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the crankshaft position system variation has not been learned. In simpler terms, this means that the engine's computer (ECU) has not been able to accurately determine the correct position of the crankshaft in relation to the camshaft. This information is crucial for proper engine operation, as it dictates the timing of fuel injection and ignition.

OBDII Code P0315 2018 GMC Sierra - Crankshaft Position System Variation Not Learned
P0315 2018 GMC Sierra Code - Crankshaft Position System Variation Not Learned

Common Causes of P0315 2018 GMC Sierra

  1. Faulty crankshaft position sensor: A malfunctioning sensor can provide inaccurate data to the ECU, leading to the P0315 code.
  2. Timing chain or belt issues: Problems with the timing chain or belt can affect the alignment of the crankshaft and camshaft, causing the code to be triggered.
  3. Wiring or connection issues: Poor electrical connections or damaged wiring can disrupt the communication between sensors and the ECU.
  4. ECU software update required: In some cases, the ECU may need to be updated with the latest software to resolve the issue.
  5. Engine mechanical problems: Issues such as worn out bearings or excessive play in engine components can affect the crankshaft position system variation.

Symptoms of P0315 2018 GMC Sierra

  1. Rough idle: The engine may run erratically at idle, vibrating or shaking more than usual.
  2. Misfires: The engine may misfire, causing a noticeable loss of power and potential hesitation during acceleration.
  3. Stalling: The vehicle may stall unexpectedly, especially when coming to a stop or idling.
  4. Poor fuel efficiency: The engine may consume more fuel than normal due to improper timing of fuel injection.
  5. Check engine light: The illumination of the check engine light on the dashboard is a common symptom associated with this code.

How to Fix P0315 2018 GMC Sierra

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and further investigate the root cause of the problem.
  2. Inspect sensors and wiring: Check the crankshaft position sensor, camshaft position sensor, and their respective wiring for any signs of damage or malfunction.
  3. Check timing components: Inspect the timing chain or belt for wear or misalignment, as this could be contributing to the issue.
  4. Perform ECU software update: If necessary, update the ECU software to ensure proper communication and accurate data interpretation.
  5. Reset crankshaft position system variation: Use a professional scan tool to reset the system variation and allow the ECU to relearn the correct positions of the crankshaft and camshaft.

Cost to Fix P0315 2018 GMC Sierra

The typical repair costs for addressing a P0315 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty sensor or repairing wiring issues can range from $100 to $300, including parts and labor. However, if more extensive repairs are needed, such as replacing timing components or updating the ECU software, the cost can increase significantly. It is advisable to consult with a qualified mechanic or repair shop to get an accurate estimate based on the specific diagnosis and required repairs. Remember that labor rates and parts prices can vary based on location, vehicle make and model, and the complexity of the repair.

What does this mean?

Tech Notes for P0315 2018 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.

Need more information about the P0315 2018 GMC Sierra code?

Need more information on how to fix the P0315 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0315 2018 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2018 GMC Sierra Code

No Frequently Asked Questions about P0315 2018 GMC Sierra Code found.

Discuss the causes and fixes for P0315 2018 GMC Sierra OBDII Code

Submit a New Comment

Code P0315 2018 GMC Sierra comments

No comments found for this page.