P0315 OBD-II: Crankshaft Position System Variation not Learned
P0315 Severity
Should you fix P0315 yourself?
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
What causes OBD-II fault code P0315?
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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