P25xx OBD-II Codes (P2500–P2599)

100 fault codes in the P25xx range. Click any code for causes, diagnostic steps, severity, and common fixes.

P2500 moderate
Generator Lamp/L-Terminal Circuit Low
P2501 moderate
Generator Lamp/L-Terminal Circuit High
P2502 moderate
Charging System Voltage
P2503 moderate
Charging System Voltage Low
P2504 moderate
Charging System Voltage High
P2505 moderate
ECM/PCM Power Input Signal
P2506 moderate
ECM/PCM Power Input Signal Range/Performance
P2507 critical
ECM/PCM Power Input Signal Low
P2508 moderate
ECM/PCM Power Input Signal High
P2509 critical
ECM/PCM Power Input Signal Intermittent
P2510 critical
ECM/PCM Power Relay Sense Circuit Range/Performance
P2511 moderate
ECM/PCM Power Relay Sense Circuit Intermittent
P2512 low
Event Data Recorder (EDR) Request Input Circuit Open
P2513 low
Event Data Recorder (EDR) Request Input Circuit Low
P2514 low
Event Data Recorder (EDR) Request Input Circuit High
P2515 moderate
A/C Refrigerant Pressure Sensor B Circuit
P2516 moderate
A/C Refrigerant Pressure Sensor "B" Circuit Range/Performance
P2517 moderate
A/C Refrigerant Pressure Sensor "B" Circuit Low
P2518 moderate
A/C Refrigerant Pressure Sensor "B" Circuit High
P2519 low
A/C Request A Circuit
P2520 low
A/C Request A Circuit Low
P2521 low
A/C Request A Circuit High
P2522 low
A/C Request B Circuit
P2523 low
A/C Request B Circuit Low
P2524 low
A/C Request B Circuit High
P2525 moderate
Vacuum Reservoir Pressure Sensor Circuit
P2526 moderate
Vacuum Reservoir Pressure Sensor Circuit Range/Performance
P2527 moderate
Vacuum Reservoir Pressure Sensor Circuit Low
P2528 moderate
Vacuum Reservoir Pressure Sensor Circuit High
P2529 critical
Fuel Rail Pressure Sensor B Circuit
P2530 moderate
Ignition Switch Run Position Circuit
P2531 critical
Ignition Switch Run Position Circuit
P2532 moderate
Ignition Switch Run Position Circuit High
P2533 moderate
Ignition Switch Run Position Circuit High
P2534 moderate
Ignition Switch Run/Start Position Circuit Low
P2535 critical
Ignition Switch Run/Start Position Circuit
P2536 critical
Ignition Switch Run/Start Position Circuit Low
P2537 moderate
Ignition Switch Accessory Position Circuit Low
P2538 low
Ignition Switch Accessory Position Circuit
P2539 critical
Low Pressure Fuel System Sensor Circuit
P2540 critical
Low Pressure Fuel System Sensor Circuit Range/Performance
P2541 critical
Low Pressure Fuel System Sensor Circuit Low
P2542 critical
Low Pressure Fuel System Sensor Circuit High
P2543 critical
Fuel Cutoff Switch Circuit
P2544 moderate
Torque Management Request Input Signal "A"
P2545 moderate
Torque Management Request Input Signal "A" Range/Performance
P2546 moderate
Torque Management Request Input Signal "A" Low
P2547 moderate
Torque Management Request Input Signal "A" High
P2548 moderate
Torque Management Request Input Signal "B"
P2549 moderate
Torque Management Request Input Signal "B" Range/Performance
P2550 moderate
Torque Management Request Input Signal "B" Low
P2551 moderate
Torque Management Request Input Signal "B" High
P2552 critical
Throttle/Fuel Inhibit Circuit
P2553 critical
Throttle/Fuel Inhibit Circuit Range/Performance
P2554 critical
Throttle/Fuel Inhibit Circuit Low
P2555 critical
Throttle/Fuel Inhibit Circuit High
P2556 moderate
Engine Coolant Level Sensor Circuit
P2557 moderate
Engine Coolant Level Sensor/Switch Circuit Range/Performance
P2558 moderate
Engine Coolant Level Sensor/Switch Circuit Low
P2559 moderate
Engine Coolant Level Sensor/Switch Circuit High
P2560 critical
Engine Coolant Level Low
P2561 serious
A/C Control Module Requested MIL Illumination
P2562 moderate
Turbocharger Boost Control Position Sensor "A" Circuit
P2563 moderate
Turbocharger Boost Control Position Sensor Circuit
P2564 moderate
Turbocharger Boost Control Position Sensor "A" Circuit Low
P2565 moderate
Turbocharger Boost Control Position Sensor "A" Circuit High
P2566 moderate
Turbocharger Boost Control Position Sensor "A" Circuit Intermittent
P2567 moderate
Engine Coolant Temperature Sensor Reference Voltage Circuit Low
P2568 moderate
Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/Performance
P2569 moderate
Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low
P2570 moderate
Direct Ozone Reduction Catalyst Temperature Sensor Circuit High
P2571 moderate
Direct Ozone Reduction Catalyst Temperature Sensor Circuit Intermittent/Erratic
P2572 moderate
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit
P2573 moderate
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Range/Performance
P2574 moderate
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Low
P2575 moderate
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit High
P2576 moderate
Direct Ozone Reduction Catalyst Deterioration Sensor Circuit Intermittent/Erratic
P2577 serious
Direct Ozone Reduction Catalyst Efficiency Below Threshold
P2578 moderate
Turbocharger Speed Sensor Circuit
P2579 moderate
Turbocharger Speed Sensor Circuit Range/Performance
P2580 moderate
Turbocharger Speed Sensor Circuit
P2581 moderate
Turbocharger Speed Sensor Circuit High
P2582 moderate
Turbocharger Speed Sensor Circuit Intermittent
P2583 moderate
Cruise Control Front Distance Range Sensor Single Sensor or Center
P2584 serious
Fuel Additive Control Module Requested MIL Illumination
P2585 serious
Fuel Additive Control Module Warning Lamp Request
P2586 critical
Turbocharger Wastegate Control Solenoid Circuit High
P2587 moderate
Turbocharger Wastegate Position Sensor Circuit
P2588 serious
Turbocharger Wastegate Position Sensor Circuit Low
P2589 serious
Turbocharger Wastegate Position Sensor Circuit High
P2590 moderate
Turbocharger Boost Control Position Sensor "B" Circuit Intermittent/Erratic
P2591 moderate
Cruise Control Front Distance Range Sensor Left
P2592 moderate
Cruise Control Front Distance Range Sensor Right
P2593 serious
Turbocharger Boost Control 'B' Position Not Reached
P2594 critical
Turbocharger Boost Control 'A' Position Exceeded
P2595 critical
Turbocharger Boost Control 'B' Position Exceeded
P2596 moderate
Turbocharger Recirculation Valve Control Circuit Open
P2597 moderate
Turbocharger Recirculation Valve Control Circuit Low
P2598 moderate
Turbocharger Recirculation Valve Control Circuit High
P2599 moderate
Turbocharger Boost Control Module Performance
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