Fault code P0315 – a step-by-step guide to diagnosing and fixing it

Error code P0315 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected that the crankshaft position sensor readings cannot be stored or retrieved properly. This DTC P0315 relates to the engine control unit and its ability to learn and store the exact position of the crankshaft. This fault code may have slightly different names for different manufacturers, but always refers to the crankshaft position sensor learning system.

What causes can this error code have?

• Defective crankshaft position sensor
• Damaged or corroded sensor cable
• Loose or dirty plug connections on the sensor
• Defective engine control unit (ECU)
• Problems with the crankshaft pulse generator or ring gear
• Incomplete learning procedure after repairs
• Weak or defective vehicle battery during the learning procedure
• Mechanical engine problems (irregular running, valve problems)

What symptoms occur in parallel with fault code P0315?

• Starting problems: The vehicle is difficult to start or does not start at all
• Rough engine running: The engine runs irregularly or jerks when idling
• Loss of power: Reduced engine power and poor acceleration
• Increased fuel consumption: Significantly higher consumption than normal
• Check engine light: The check engine light is permanently illuminated
• Misfiring: Noticeable misfires while driving
• Emergency running program: The vehicle switches to safety mode

How can the problem with error code P0315 be rectified?

• Troubleshooting trouble code P0315 requires a systematic approach, as several components can be affected.
• Carry out a crankshaft position sensor learning procedure: Using a professional OBD scanner, start the manufacturer-specific learning procedure and allow it to complete fully
• Replace crankshaft position sensor: Remove the defective sensor and replace it with a new original part, then carry out the learning procedure
• Check and repair sensor cables and plug connections: Inspect all cable connections for damage, clean or replace defective cables
• Diagnose engine control unit and replace if necessary: Test ECU with diagnostic unit and replace with programmed replacement unit if defective
• Inspect and repair crankshaft pulse generator: Check sprocket for damage and replace or repair if necessary
• Check battery and charging system: Test battery condition and replace weak battery, check alternator for proper function