Error code

OBD2 P0315

OBD2P0315
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Crankshaft Position System Variation Not Learned.

Severity

moderateCan drive, but may experience rough idling and misfires.

Summary

P0315 indicates that there is an issue with the crankshaft position system variation not being learned by the PCM (Powertrain Control Module). This can affect engine timing and performance.

Symptoms

  • Engine misfires
  • Rough or erratic idle
  • Difficulty starting

Common Causes

  • Disconnecting the battery without using a memory saving device
  • Damaged, burnt, shorted, disconnected, or corroded wiring between the crankshaft position sensor and PCM
  • Defective crankshaft position sensor
  • Failure to perform the required relearning procedure correctly
  • Replacing the crankshaft position sensor with an unsuitable aftermarket part
  • Worn timing components such as belts/chains/sprockets

Diagnosis

  1. Check for damaged or corroded wiring between the crankshaft position sensor and PCM.
  2. Verify that a proper relearning procedure was performed after any maintenance involving battery disconnection.
  3. Inspect timing components such as belts, chains, sprockets, tensioners, and guides.

Fixes

  • Replace the crankshaft position sensor if it is defective.

FAQ

What happens when P0315 is not fixed?

The engine may experience misfires, rough idling, and difficulty starting.

How can I prevent this issue from happening again?

Ensure proper relearning procedures are followed after battery disconnection or major maintenance. Use a memory saving device when disconnecting the battery.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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