P2561
A/C Control Module Requested MIL Illumination
- Severity
- Low
- Driving
- Drivable — book it in
This is not a fault in itself. The air conditioning control module has asked for the check engine light to be switched on because it has stored a fault of its own. The actual problem is recorded inside the climate module, and that is what has to be read - this code names no component and will clear when the real fault is fixed.
Possible causes
- CommonA fault stored in the air conditioning control module - this code only reports that one exists
What you might notice
- Check engine light on
- Air conditioning not working or working poorly
- Often no other symptom
What to check, in order
- Read the air conditioning control module, not just the engine module. Many basic scan tools only read the engine module, which is why this code so often appears alone with nothing to explain it.
- The real code will be stored in the climate module. Diagnose that one.
- Do not replace parts on the strength of this code alone.
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