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P0315
Sistema
Powertrain (Engine)
Scanner richiesto
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Crankshaft Position System Variation Not Learned

Understand P0315, common causes, and the right TOPDON scanner to diagnose it.

PCM has not learned crankshaft position variation — required after crank sensor, PCM, or harmonic balancer service on many GM/Ford models.

Sintomi comuni

  • Rough idle after repair
  • Misfire codes
  • Stalling
  • No-start after battery disconnect on some models

Cause tipiche

  • Crank relearn not performed after repair
  • New crank sensor without relearn
  • PCM replacement
  • Damaged reluctor ring

Di quale scanner hai bisogno?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Usa dati live e freeze frame prima di sostituire componenti. I codici ABS, SRS e U richiedono di solito uno scanner full-system.

Consigli diagnostici

  • Registra il freeze frame quando compare il codice
  • Cancella il codice solo dopo aver risolto la causa
  • Controlla codici pending correlati
  • Verifica che la batteria sia sopra 12,4 V prima di sospettare i sensori

Scanner TOPDON consigliati

Domande frequenti

What does P0315 mean?
P0315 indicates crankshaft position system variation not learned. PCM has not learned crankshaft position variation — required after crank sensor, PCM, or harmonic balancer service on many GM/Ford models.
Can I diagnose P0315 with a basic code reader?
P0315 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Which TOPDON scanner do I need for P0315?
Full-system scanner (engine, ABS, SRS, transmission, service resets) See recommended tools on this page.
Is it safe to drive with P0315?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.