P2515
A/C Refrigerant Pressure Sensor "B" Circuit
- Severity
- Low
- Driving
- No driving restriction
A fault in the air conditioning refrigerant pressure sensor "B" circuit. This sensor protects the compressor by telling the module when pressure is too low or too high to run safely. With no reading the module will usually refuse to engage the compressor.
Possible causes
- CommonLow refrigerant charge, usually from a slow leak
- CommonFailed refrigerant pressure sensor
- CommonCorroded connector or damaged wiring
- PossibleBlocked condenser restricting flow
- PossibleLoss of reference voltage or earth
- PossibleFailed compressor
What you might notice
- Air conditioning not cooling
- Compressor not engaging
- Cooling fans running constantly
- Air conditioning cutting in and out
- Check engine light on
What to check, in order
- Have the refrigerant charge checked. The pressure sensor exists to protect the compressor, and a low charge makes it do exactly what this code describes - the sensor is often right.
- Inspect the connector for corrosion and water.
- Check the reference voltage and earth at the sensor.
- Check the condenser is clear of leaves, insects and road debris.
- If refrigerant has been lost, find the leak rather than simply recharging. A system topped up without repair will be empty again within months.
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