The ECU is not seeing the expected feedback from its main relay. Symptoms are intermittent no-starts and warning lights that appear for no reason.
P2510 — also written P251O, P 2510, 2510 — is the OBD-II code for ecm/pcm power relay sense circuit range/performance. Same code, same fix: this page covers every spelling of it.
P2510 is a electrical fault code, typically costing £60–£300 to put right in a UK garage.
What causes P2510?
- Failed main relay
- Corroded relay socket
- Poor earth
- Water in the fuse box
How P2510 is fixed
- Swap in a known-good relay
- Clean and repair the relay socket terminals
- Dry and reseal the fuse box
P2510 repair cost in the UK
Most P2510 repairs land between £60–£300 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 P2510?
Risk of an intermittent no-start, so fix it before relying on the car.
Urgency: medium.