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 FOXWELL 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

Quale scanner ti serve?

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 spesso uno scanner mult sistema.

Consigli diagnostici

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

Scanner FOXWELL consigliati

Domande frequenti

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.
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.