Fault codes P25xx: auxiliary inputs and electrical circuit
Engine and transmission codes common to all makes (SAE J2012 standard).
Official codes: 256, from smallest to largest. Tap a code to get a direct link to share.
| Code | Meaning |
|---|---|
| P2500 | Generator Lamp/L-Terminal Circuit Low |
| P2501 | Generator Lamp/L-Terminal Circuit High |
| P2502 | Charging System Voltage |
| P2503 | Charging System Voltage Low |
| P2504 | Charging System Voltage High |
| P2505 | ECM/PCM Power Input Signal |
| P2506 | ECM/PCM Power Input Signal Range/Performance |
| P2507 | ECM/PCM Power Input Signal Low |
| P2508 | ECM/PCM Power Input Signal High |
| P2509 | ECM/PCM Power Input Signal Intermittent |
| P250A | Engine Oil Level Sensor Circuit |
| P250B | Engine Oil Level Sensor Circuit Range/Performance |
| P250C | Engine Oil Level Sensor Circuit Low |
| P250D | Engine Oil Level Sensor Circuit High |
| P250E | Engine Oil Level Sensor Circuit Intermittent/Erratic |
| P250F | Engine Oil Level Too Low |
| P2510 | ECM/PCM Power Relay Sense Circuit Range/Performance |
| P2511 | ECM/PCM Power Relay Sense Circuit Intermittent |
| P2512 | Event Data Recorder Request Circuit/Open |
| P2513 | Event Data Recorder Request Circuit Low |
| P2514 | Event Data Recorder Request Circuit High |
| P2515 | A/C Refrigerant Pressure Sensor B Circuit |
| P2516 | A/C Refrigerant Pressure Sensor B Circuit Range/Performance |
| P2517 | A/C Refrigerant Pressure Sensor B Circuit Low |
| P2518 | A/C Refrigerant Pressure Sensor B Circuit High |
| P2519 | A/C Request A Circuit |
| P251A | PTO Enable Switch Circuit/Open |
| P251B | PTO Enable Switch Circuit Low |
| P251C | PTO Enable Switch Circuit High |
| P251D | PTO Engine Shutdown Circuit/Open |
| P251E | PTO Engine Shutdown Circuit Low |
| P251F | PTO Engine Shutdown Circuit High |
| P2520 | A/C Request A Circuit Low |
| P2521 | A/C Request A Circuit High |
| P2522 | A/C Request B Circuit |
| P2523 | A/C Request B Circuit Low |
| P2524 | A/C Request B Circuit High |
| P2525 | Vacuum Reservoir Pressure Sensor Circuit |
| P2526 | Vacuum Reservoir Pressure Sensor Circuit Range/Performance |
| P2527 | Vacuum Reservoir Pressure Sensor Circuit Low |
| P2528 | Vacuum Reservoir Pressure Sensor Circuit High |
| P2529 | Vacuum Reservoir Pressure Sensor Circuit Intermittent |
| P252A | Engine Oil Quality Sensor Circuit |
| P252B | Engine Oil Quality Sensor Circuit Range/Performance |
| P252C | Engine Oil Quality Sensor Circuit Low |
| P252D | Engine Oil Quality Sensor Circuit High |
| P252E | Engine Oil Quality Sensor Circuit Intermittent/Erratic |
| P252F | Engine Oil Level Too High |
| P2530 | Ignition Switch Run Position Circuit |
| P2531 | Ignition Switch Run Position Circuit Low |
| P2532 | Ignition Switch Run Position Circuit High |
| P2533 | Ignition Switch On/Start Position Circuit |
| P2534 | Ignition Switch On/Start Position Circuit Low |
| P2535 | Ignition Switch On/Start Position Circuit High |
| P2536 | Ignition Switch Accessory Position Circuit |
| P2537 | Ignition Switch Accessory Position Circuit Low |
| P2538 | Ignition Switch Accessory Position Circuit High |
| P2539 | Low Pressure Fuel System Sensor Circuit |
| P253A | PTO Sense Circuit/Open |
| P253B | PTO Sense Circuit Range/Performance |
| P253C | PTO Sense Circuit Low |
| P253D | PTO Sense Circuit High |
| P253E | PTO Sense Circuit Intermittent/Erratic |
| P253F | Engine Oil Deteriorated |
| P2540 | Low Pressure Fuel System Sensor Circuit |
| P2541 | Low Pressure Fuel System Sensor Circuit Range/Performance |
| P2542 | Low Pressure Fuel System Sensor Circuit High |
| P2543 | Power Demand Signal Circuit |
| P2544 | Torque Management Request Input Signal A |
| P2545 | Torque Management Request Input Signal A Range/Performance |
| P2546 | Torque Management Request Input Signal A Low |
| P2547 | Torque Management Request Input Signal A High |
| P2548 | Torque Management Request Input Signal B |
| P2549 | Torque Management Request Input Signal B Range/Performance |
| P254A | PTO Speed Selector Sensor/Switch 1 Circuit/Open |
| P254B | PTO Speed Selector Sensor/Switch 1 Range/Performance |
| P254C | PTO Speed Selector Sensor/Switch 1 Circuit Low |
| P254D | PTO Speed Selector Sensor/Switch 1 Circuit High |
| P254E | PTO Speed Selector Sensor/Switch 1 Circuit Intermittent/Erratic |
| P254F | Engine Hood Switch Circuit |
| P2550 | Torque Management Request Input Signal B Low |
| P2551 | Torque Management Request Input Signal B High |
| P2552 | Throttle/Fuel Inhibit A Circuit |
| P2553 | Throttle/Fuel Inhibit A Circuit Range/Performance |
| P2554 | Throttle/Fuel Inhibit A Circuit Low |
| P2555 | Throttle/Fuel Inhibit A Circuit High |
| P2556 | Engine Coolant Level Sensor/Switch Circuit |
| P2557 | Engine Coolant Level Sensor/Switch Circuit Range/Performance |
| P2558 | Engine Coolant Level Sensor/Switch Circuit Low |
| P2559 | Engine Coolant Level Sensor/Switch Circuit High |
| P255A | PTO Speed Selector Sensor/Switch 2 Circuit/Open |
| P255B | PTO Speed Selector Sensor/Switch 2 Range/Performance |
| P255C | PTO Speed Selector Sensor/Switch 2 Circuit Low |
| P255D | PTO Speed Selector Sensor/Switch 2 Circuit High |
| P255E | PTO Speed Selector Sensor/Switch 2 Circuit Intermittent/Erratic |
| P255F | A/C Request A Circuit Range/Performance |
| P2560 | Engine Coolant Level Low |
| P2561 | A/C Control Module Requested MIL Illumination |
| P2562 | Turbocharger Boost Control Position Sensor A Circuit |
| P2563 | Turbocharger Boost Control Position Sensor Circuit |
| P2564 | Turbocharger Boost Control Position Sensor A Circuit Low |
| P2565 | Turbocharger Boost Control Position Sensor A Circuit High |
| P2566 | Turbocharger Boost Control Position Sensor Range/Performance |
| P2567 | Turbocharger Boost Control Position Sensor Circuit Low |
| P2568 | Turbocharger Boost Control Position Sensor Circuit High |
| P2569 | Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low |
| P256A | Engine Idle Speed Selector Sensor/Switch Circuit/Open |
| P256B | Engine Idle Speed Selector Sensor/Switch Range/Performance |
| P256C | Engine Idle Speed Selector Sensor/Switch Circuit Low |
| P256D | Engine Idle Speed Selector Sensor/Switch Circuit High |
| P256E | Engine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic |
| P256F | A/C Request B Circuit Range/Performance |
| P2570 | Direct Ozone Reduction Catalyst Temperature Sensor Circuit High |
| P2571 | Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic |
| P2572 | Direct Ozone Reduction Catalyst Deterioration Sensor Circuit |
| P2573 | Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance |
| P2574 | Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low |
| P2575 | Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High |
| P2576 | Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic |
| P2577 | Direct Ozone Reduction Catalyst Efficiency Below Threshold |
| P2578 | Turbocharger/Supercharger Speed Sensor A Circuit |
| P2579 | Turbocharger/Supercharger Speed Sensor A Circuit Range/Performance |
| P257A | Vacuum Reservoir Control Circuit/Open |
| P257B | Vacuum Reservoir Control Circuit Low |
| P257C | Vacuum Reservoir Control Circuit High |
| P257D | Engine Hood Switch Circuit Range/Performance |
| P257E | Engine Hood Switch Circuit Low |
| P257F | Engine Hood Switch Circuit High |
| P2580 | Turbocharger/Supercharger Speed Sensor A Circuit Low |
| P2581 | Turbocharger/Supercharger Speed Sensor A Circuit High |
| P2582 | Turbocharger/Supercharger Speed Sensor A Circuit Intermittent |
| P2583 | Cruise Control Front Distance Range Sensor Single Sensor or Center |
| P2584 | Fuel Additive Control Module Requested MIL Illumination |
| P2585 | Fuel Additive Control Module Warning Lamp Request |
| P2586 | Turbocharger Boost Control Position Sensor B Circuit |
| P2587 | Turbocharger Boost Control Position Sensor B Circuit Range/Performance |
| P2588 | Turbocharger Boost Control Position Sensor B Circuit Low |
| P2589 | Turbocharger Boost Control Position Sensor B Circuit High |
| P258A | Vacuum Pump Control Circuit A/Open |
| P258B | Vacuum Pump Control Circuit A Range/Performance |
| P258C | Vacuum Pump Control Circuit A Low |
| P258D | Vacuum Pump Control Circuit A High |
| P258E | PTO Enable Switch Performance |
| P258F | Torque Management Request Output Signal |
| P2590 | Turbocharger Boost Control Position Sensor B Circuit Intermittent/Erratic |
| P2591 | Cruise Control Front Distance Range Sensor Left |
| P2592 | Cruise Control Front Distance Range Sensor Right |
| P2593 | Turbocharger Speed Sensor B Circuit |
| P2594 | Turbocharger Speed Sensor B Circuit Range/Performance |
| P2595 | Turbocharger Speed Sensor B Circuit Low |
| P2596 | Turbocharger Speed Sensor B Circuit High |
| P2597 | Turbocharger Speed Sensor B Circuit Intermittent |
| P2598 | Turbocharger Boost Control Position Sensor A Performance - Stuck Low |
| P2599 | Turbocharger Boost Control Position Sensor A Performance - Stuck High |
| P259A | Turbocharger Boost Control Position Sensor B Performance - Stuck Low |
| P259B | Turbocharger Boost Control Position Sensor B Performance - Stuck High |
| P259C | Excessive Time To Enter Closed Loop Turbocharger A Boost Control |
| P259D | Excessive Time To Enter Closed Loop Turbocharger B Boost Control |
| P259E | Turbocharger A Boost Control Position At Low Limit |
| P259F | Turbocharger A Boost Control Position At High Limit |
| P25A0 | Turbocharger B Boost Control Position At Low Limit |
| P25A1 | Turbocharger B Boost Control Position At High Limit |
| P25A2 | Brake System Control Module A Requested MIL Illumination |
| P25A3 | Engine Hood Open |
| P25A4 | Fuel Mode Select Switch Circuit |
| P25A5 | Fuel Mode Select Switch Performance |
| P25A6 | Fuel Mode Select Switch Circuit Low |
| P25A7 | Fuel Mode Select Switch Circuit High |
| P25A8 | Fuel Mode Select Switch Circuit Intermittent/Erratic |
| P25A9 | Piston Cooling Oil Control Circuit/Open |
| P25AA | Piston Cooling Oil Control Circuit Low |
| P25AB | Piston Cooling Oil Control Circuit High |
| P25AC | Piston Cooling Oil Control Circuit Performance/Stuck Off |
| P25AD | Piston Cooling Oil Control Circuit Stuck On |
| P25AE | Piston Cooling Oil Pressure Too Low |
| P25AF | Coolant Temperature Control Module Requested MIL Illumination |
| P25B0 | Fuel Level Sensor A Stuck |
| P25B1 | Fuel Level Sensor B Stuck |
| P25B2 | Fuel Level Sensor A or B Stuck |
| P25B3 | Turbocharger/Supercharger Wastegate A Stuck Open |
| P25B4 | Turbocharger/Supercharger Wastegate A Stuck Closed |
| P25B5 | Turbocharger/Supercharger Wastegate B Stuck Open |
| P25B6 | Turbocharger/Supercharger Wastegate B Stuck Closed |
| P25B7 | Auxiliary Ignition Switch On/Start Position Circuit |
| P25B8 | Auxiliary Ignition Switch On/Start Position Circuit Low |
| P25B9 | Auxiliary Ignition Switch On/Start Position Circuit High |
| P25BA | Regeneration Control Switch Circuit/Open |
| P25BB | Regeneration Control Switch Circuit Low |
| P25BC | Regeneration Control Switch Circuit High |
| P25BD | Unmetered Fuel - Forced Engine Shutdown |
| P25BE | Alternative Fuel Disable Control Circuit / Open |
| P25BF | Alternative Fuel Disable Control Circuit High |
| P25C0 | Alternative Fuel Disable Control Circuit Low |
| P25C1 | Alternative Fuel Disable Signal Circuit |
| P25C2 | Alternative Fuel Disable Signal Circuit High |
| P25C3 | Alternative Fuel Disable Signal Circuit Low |
| P25C4 | Brake Booster Temperature Sensor A Circuit |
| P25C5 | Brake Booster Temperature Sensor A Circuit Range/Performance |
| P25C6 | Brake Booster Temperature Sensor A Circuit Low |
| P25C7 | Brake Booster Temperature Sensor A Circuit High |
| P25C8 | Brake Booster Temperature Sensor A Circuit Intermittent/Erratic |
| P25C9 | Brake System Control Module B Requested MIL Illumination |
| P25CA | Intake Camshaft Actuator Park Lock Control Circuit / Open Bank 1 |
| P25CB | Intake Camshaft Actuator Park Lock Control Circuit Low Bank 1 |
| P25CC | Intake Camshaft Actuator Park Lock Control Circuit High Bank 1 |
| P25CD | Intake Camshaft Actuator Park Lock Control Circuit / Open Bank 2 |
| P25CE | Intake Camshaft Actuator Park Lock Control Circuit Low Bank 2 |
| P25CF | Intake Camshaft Actuator Park Lock Control Circuit High Bank 2 |
| P25D0 | Exhaust Camshaft Actuator Park Lock Control Circuit / Open Bank 1 |
| P25D1 | Exhaust Camshaft Actuator Park Lock Control Circuit Low Bank 1 |
| P25D2 | Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 1 |
| P25D3 | Exhaust Camshaft Actuator Park Lock Control Circuit / Open Bank 2 |
| P25D4 | Exhaust Camshaft Actuator Park Lock Control Circuit Low Bank 2 |
| P25D5 | Exhaust Camshaft Actuator Park Lock Control Circuit High Bank 2 |
| P25D6 | Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Stop Performance |
| P25D7 | Fuel Level Sensor C Circuit |
| P25D8 | Fuel Level Sensor C Performance |
| P25D9 | Fuel Level Sensor C Circuit Low |
| P25DA | Fuel Level Sensor C Circuit High |
| P25DB | Fuel Level Sensor C Circuit Intermittent |
| P25DC | Fuel Level Sensor C Stuck |
| P25DD | A Camshaft Position - Stuck In Locked Position Bank 1 |
| P25DE | A Camshaft Position - Unable to Achieve Locked Position Bank 1 |
| P25DF | A Camshaft Position Control Performance Bank 1 |
| P25E0 | A Camshaft Position - Stuck In Locked Position Bank 2 |
| P25E1 | A Camshaft Position - Unable to Achieve Locked Position Bank 2 |
| P25E2 | A Camshaft Position Control Performance Bank 2 |
| P25E3 | B Camshaft Position - Stuck In Locked Position Bank 1 |
| P25E4 | B Camshaft Position - Unable to Achieve Locked Position Bank 1 |
| P25E5 | B Camshaft Position Control Performance Bank 1 |
| P25E6 | B Camshaft Position - Stuck In Locked Position Bank 2 |
| P25E7 | B Camshaft Position - Unable to Achieve Locked Position Bank 2 |
| P25E8 | B Camshaft Position Control Performance Bank 2 |
| P25E9 | Supercharger Disconnect Clutch Stuck Open |
| P25EA | Supercharger Disconnect Clutch Stuck Closed |
| P25EB | Supercharger Disconnect Clutch Circuit Range/Performance |
| P25EC | Supercharger Disconnect Clutch Circuit Low |
| P25ED | Supercharger Disconnect Clutch Circuit High |
| P25EE | Vacuum Pump Control Circuit B / Open |
| P25EF | Vacuum Pump Control Circuit B Range/Performance |
| P25F0 | Vacuum Pump Control Circuit B Low |
| P25F1 | Vacuum Pump Control Circuit B High |
| P25F2 | Turbocharger/Supercharger Boost Sensor C Circuit |
| P25F3 | Turbocharger/Supercharger Boost Sensor C Circuit Range/Performance |
| P25F4 | Turbocharger/Supercharger Boost Sensor C Circuit Low |
| P25F5 | Turbocharger/Supercharger Boost Sensor C Circuit High |
| P25F6 | AIR System B |
| P25F7 | AIR System B Incorrect Flow Detected |
| P25F8 | Turbocharger/Supercharger Bypass Valve C Control Circuit |
| P25F9 | Turbocharger/Supercharger Bypass Valve C Control Circuit Low |
| P25FA | Turbocharger/Supercharger Bypass Valve C Control Circuit High |
| P25FB | Turbocharger/Supercharger Bypass Valve C Control Circuit Range/Performance |
| P25FC | Turbocharger/Supercharger Bypass Valve C - Mechanical |
| P25FD | Turbocharger/Supercharger Bypass Valve C Temperature Too High |
| P25FE | Supercharger Disconnect Clutch |
| P25FF | Electrical System Voltage Stabilizer Control Module Performance |
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Official meanings: OBDex (public domain, CC0). Manufacturer codes: dtc-database (MIT license), probable meanings not verified by the manufacturers. The same meaning can vary depending on the model: always have a diagnosis confirmed by a professional.