The ECU has not stored the crank sensor variation values it needs to detect misfires accurately. Very common after a crank sensor, ECU or engine repair.
P0315 — also written PO315, P 0315, 0315 — is the OBD-II code for crankshaft position system variation not learned. Same code, same fix: this page covers every spelling of it.
P0315 is a engine fault code, typically costing £40–£90 to put right in a UK garage.
What causes P0315?
- Crank relearn procedure never carried out after a repair
- Replaced crank sensor or flywheel
- ECU replaced or re-flashed
How P0315 is fixed
- Carry out the crankshaft variation relearn with a capable scan tool — usually a ten-minute drive procedure
- No parts normally required
P0315 repair cost in the UK
Most P0315 repairs land between £40–£90 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P0315?
Yes. This is a procedure, not a broken part.
Urgency: low.