P2510
ECM/PCM Power Relay Sense Circuit Range/Performance
- Severity
- High
- Driving
- Drive only to a garage
The engine module's power relay sense circuit is reporting something implausible - the relay's actual state does not match what was commanded, or the timing is wrong. Usually the relay contacts are sticking or slow, which is a mechanical failure inside the relay rather than a wiring problem.
Possible causes
- CommonFailed power relay with worn or sticking contacts
- CommonCorroded relay socket or fuse box connections
- CommonWater ingress into the fuse box
- PossibleWiring fault on the sense circuit
- PossibleWeak battery making relay operation marginal
- RareFailed module input
What you might notice
- Intermittent limp mode
- Engine occasionally dead at start-up
- Battery draining after standing
- Check engine light on
What to check, in order
- Swap the relay with an identical one from elsewhere in the box and see whether the fault follows it. It costs nothing and is the fastest test available.
- Inspect the relay socket for corrosion and heat damage - a discoloured socket means the relay has been running hot.
- Check the fuse box for water ingress, particularly if it is mounted low or in the engine bay.
- Check battery voltage - a weak battery makes a marginal relay behave like a failing one.
- If the battery goes flat overnight, investigate this rather than replacing the battery. A relay that will not release keeps the module powered all night.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Vehicle speed control, idle control and auxiliary inputs
P2500P2501P2502P2503P2504P2505P2506P2507P2508P2509P2510P2511P2512P2513P2514P2515P2516P2517P2518P2519P2520P2521P2522P2523P2524P2525P2526P2527P2528P2529P2530P2531P2532P2533P2534P2535P2536P2537P2538P2539P2540P2541P2542P2543P2544P2545P2546P2547P2548P2549P2550P2551P2552P2553P2554P2555P2556P2557P2558P2559P2560P2561P2562P2563P2564P2565P2566P2567P2568P2569P2570P2571P2572P2573P2574P2575P2576P2577