Code Definition

P0315 — Crankshaft position sensor block learn error

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0315

P0315 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0315 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0315 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The engine control module (ECM) sets this code when it detects that it has not successfully learned the crankshaft position sensor's variation values. This learning process is essential for accurate misfire detection and proper ignition timing. The error may occur after battery disconnection, ECM replacement, or if the sensor signal is unstable.

Quick Facts