P0315 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 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.
Code P0315 Description
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.
What are the Possible Causes of the DTC P0315?
- 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?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0315 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 Makes
- P0315 Buick — Crankshaft Position System Variation Not Learned
- P0315 Cadillac — Crankshaft Position System Variation Not Learned
- P0315 Chevrolet — Crankshaft Position System Variation Not Learned
- P0315 Chrysler — No Crank Sensor Learned
- P0315 Dodge — No Crank Sensor Learned
- P0315 Ford — Crankshaft Position System Variation Not Learned
- P0315 GMC — Crankshaft Position System Variation Not Learned
- P0315 Hyundai — Segment Time Acquistion Incorrect
- P0315 Isuzu — Crankshaft Position System Variation Not Learned
- P0315 Jeep — No Crank Sensor Learned
- P0315 KIA — Segment Time Acquisition Incorrect
- P0315 Mazda — Powertrain Control Module Crankshaft Sensor Learn Ability Disabled
- P0315 Mitsubishi — No Crank Sensor Learned
Frequently Asked Questions about P0315 Code
1. What does the OBDII code P0315 mean?
P0315 indicates that the vehicle's powertrain control module (PCM) has not learned the crankshaft position variation after a repair or replacement.
2. What are the symptoms of code P0315?
Common symptoms include the check engine light turning on, rough idling, poor acceleration, reduced fuel efficiency, and occasional engine misfires.
3. What causes the P0315 code to appear?
P0315 is typically caused by a crankshaft position sensor replacement, PCM replacement, a dead battery, or changes to the engine's timing components without performing a relearn procedure.
4. How do you fix the P0315 code?
The most common fix is to perform a crankshaft position variation relearn procedure using a compatible scan tool. If the problem persists, inspect the crankshaft position sensor and wiring.
5. Can I drive with a P0315 code?
Driving with a P0315 code is possible but not recommended, as it may lead to poor engine performance, increased emissions, and potential long-term damage.
6. What tools are needed to fix a P0315 code?
A professional OBDII scan tool capable of performing a crankshaft position variation relearn is required to fix this issue.
7. Do I need to replace the crankshaft position sensor for a P0315 code?
Not necessarily. The sensor may still be functional, and the code may only require the relearn procedure to clear.
8. How much does it cost to fix a P0315 code?
The cost varies depending on the labor rate and whether additional repairs are needed, but a relearn procedure typically costs $50–$150 at a repair shop.
9. Can a weak battery cause the P0315 code?
Yes, a weak or dead battery can cause the PCM to lose learned data, resulting in the P0315 code.
10. What happens if I ignore the P0315 code?
Ignoring the P0315 code can lead to ongoing engine performance issues, increased emissions, and potential damage to other components over time.
Discuss the causes and fixes for P0315 OBDII Code
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