What are the common causes of P0315?

A crank position relearn that was never run. A crank position sensor replaced without a relearn. A damaged crank tone ring. Wiring faults on the crank sensor circuit. A faulty ECM keeping the learned value.

Run the crank position variation relearn with a scan tool. Inspect the crank sensor and tone ring for damage. Check the crank sensor wiring and connector. Verify the sensor is installed and gapped right. Relearn again after any sensor or ring replacement. Clear the code and retest.

P0315

Crankshaft Position System Variation Not Learned

System: Ignition and misfire (P code)
Lamp: Check Engine Light
Category: Powertrain - Ignition

What it means

P0315 means Crankshaft Position System Variation Not Learned.

Check these first

A crank position relearn that was never run
A crank position sensor replaced without a relearn
A damaged crank tone ring
Wiring faults on the crank sensor circuit
A faulty ECM keeping the learned value

What to do next

Run the crank position variation relearn with a scan tool
Inspect the crank sensor and tone ring for damage
Check the crank sensor wiring and connector
Verify the sensor is installed and gapped right
Relearn again after any sensor or ring replacement
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.