P0315 Code - Crankshaft Position System Variation Not Learned

What Does P0315 Mean?

OBD-II Code P0315 is defined as a Crankshaft Position System Variation not Learned
The Crankshaft Position Sensor measures the exact rotational speed and position of the crankshaft. This provides a critical data signal used by the engine control module (PCM) to control Ignition Spark Timing and Fuel Delivery. On some vehicles the crankshaft position must be relearned by the control module by manually going through the appropriate procedure when the crankshaft sensor is replaced or the battery is disconnected. Failure to properly complete the relearn procedure will set code P0315.

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What are the common causes of P0315 ?

Common failures in the CPS system include a damaged crankshaft position sensor, sensor connector, or electrical wiring. Technicians have reported that the presence of oil leaking on the outside of the engine often causes deteriorated insulation on wiring and may lead to shorted and loose connectors. Broken crankshaft reluctor rings or missing teeth may also cause this code to be set. Broken timing belts that are wound around crankshaft and camshaft timing gears can often result in damage to CPS system components and wiring. Sensor and wiring failure often reveals itself as an open or shorted (power or ground) circuit. The PCM could also be the culprit but this scenario occurs rarely.

How do you troubleshoot P0315 ?

The most common repairs to address the P0315 code are as follows:

• Repair or replace wiring harness around crankshaft position sensor
• Repair or replace crankshaft position sensor
• Repair or replace crankshaft or related components
• Repair or replace timing belt
• Repair or replace powertrain control module

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