P0315
Sistema
Powertrain (Engine)
Escáner necesario
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.

Síntomas habituales

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

Causas típicas

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

¿Qué escáner necesita?

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

Use datos en vivo y freeze frame antes de cambiar piezas. Códigos ABS, SRS y U suelen requerir un escáner de todos los sistemas.

Consejos de diagnóstico

  • Registre el freeze frame cuando se active el código
  • Borre el código solo tras corregir la causa
  • Revise códigos pendientes relacionados
  • Verifique que la batería esté por encima de 12,4 V antes de sospechar sensores

Escáneres FOXWELL recomendados

Preguntas frecuentes

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.