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P0315
System
Powertrain (Engine)
Scanner som krävs
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.

Vanliga symptom

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

Typiska orsaker

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

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade TOPDON-scannrar

Vanliga frågor

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.