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THE CODE DIRECTORY

Diagnostic code references — Page 83.

Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.

11,786 code references

Generic OBD-II
P250C

Engine Oil Level Sensor Circuit Low

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Generic OBD-II
P250D

Engine Oil Level Sensor Circuit High

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Generic OBD-II
P250E

Engine Oil Level Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P250F

Engine Oil Level Too Low

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Generic OBD-II
P2510

ECM/PCM Power Relay Sense Circuit Range/Performance

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Generic OBD-II
P2511

ECM/PCM Power Relay Sense Circuit Intermittent

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Generic OBD-II
P2512

Event Data Recorder Request Circuit/ Open

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Generic OBD-II
P2513

Event Data Recorder Request Circuit Low

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Generic OBD-II
P2514

Event Data Recorder Request Circuit High

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Generic OBD-II
P2515

A/C Refrigerant Pressure Sensor B Circuit

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Generic OBD-II
P2516

A/C Refrigerant Pressure Sensor B Circuit Range/Performance

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Generic OBD-II
P2517

A/C Refrigerant Pressure Sensor B Circuit Low

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Generic OBD-II
P2518

A/C Refrigerant Pressure Sensor B Circuit High

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Generic OBD-II
P2519

A/C Request A Circuit

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Generic OBD-II
P251A

PTO Enable Switch Circuit/Open

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Generic OBD-II
P251B

PTO Enable Switch Circuit Low

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Generic OBD-II
P251C

PTO Enable Switch Circuit High

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Generic OBD-II
P251D

PTO Engine Shutdown Circuit/Open

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Generic OBD-II
P251E

PTO Engine Shutdown Circuit Low

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Generic OBD-II
P251F

PTO Engine Shutdown Circuit High

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Generic OBD-II
P2520

A/C Request A Circuit Low

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Generic OBD-II
P2521

A/C Request A Circuit High

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Generic OBD-II
P2522

A/C Request B Circuit

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Generic OBD-II
P2523

A/C Request B Circuit Low

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Generic OBD-II
P2524

A/C Request B Circuit High

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Generic OBD-II
P2525

Vacuum Reservoir Pressure Sensor Circuit

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Generic OBD-II
P2526

Vacuum Reservoir Pressure Sensor Circuit Range/Performance

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Generic OBD-II
P2527

Vacuum Reservoir Pressure Sensor Circuit Low

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Generic OBD-II
P2528

Vacuum Reservoir Pressure Sensor Circuit High

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Generic OBD-II
P2529

Vacuum Reservoir Pressure Sensor Circuit Intermittent

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Generic OBD-II
P252A

Engine Oil Quality Sensor Circuit

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Generic OBD-II
P252B

Engine Oil Quality Sensor Circuit Range/Performance

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Generic OBD-II
P252C

Engine Oil Quality Sensor Circuit Low

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Generic OBD-II
P252D

Engine Oil Quality Sensor Circuit High

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Generic OBD-II
P252E

Engine Oil Quality Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P252F

Engine Oil Level Too High

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Generic OBD-II
P2530

Ignition Switch Run Position Circuit

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Generic OBD-II
P2531

Ignition Switch Run Position Circuit Low

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Generic OBD-II
P2532

Ignition Switch Run Position Circuit High

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Generic OBD-II
P2533

Ignition Switch On/Start Position Circuit

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Generic OBD-II
P2534

Ignition Switch On/Start Position Circuit Low

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Generic OBD-II
P2535

Ignition Switch On/Start Position Circuit High

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Generic OBD-II
P2536

Ignition Switch Accessory Position Circuit

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Generic OBD-II
P2537

Ignition Switch Accessory Position Circuit Low

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Generic OBD-II
P2538

Ignition Switch Accessory Position Circuit High

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Generic OBD-II
P2539

Low Pressure Fuel System Sensor Circuit

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Generic OBD-II
P253A

PTO Sense Circuit/Open

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Generic OBD-II
P253B

PTO Sense Circuit Range/Performance

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Generic OBD-II
P253C

PTO Sense Circuit Low

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Generic OBD-II
P253D

PTO Sense Circuit High

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Generic OBD-II
P253E

PTO Sense Circuit Intermittent/Erratic

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Generic OBD-II
P253F

Engine Oil Deteriorated

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Generic OBD-II
P2540

Low Pressure Fuel System Sensor Circuit Range/Performance

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Generic OBD-II
P2541

Low Pressure Fuel System Sensor Circuit Low

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Generic OBD-II
P2542

Low Pressure Fuel System Sensor Circuit High

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Generic OBD-II
P2543

Low Pressure Fuel System Sensor Circuit Intermittent

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Generic OBD-II
P2544

Torque Management Request Input Signal A

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Generic OBD-II
P2545

Torque Management Request Input Signal A Range/Performance

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Generic OBD-II
P2546

Torque Management Request Input Signal A Low

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Generic OBD-II
P2547

Torque Management Request Input Signal A High

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Generic OBD-II
P2548

Torque Management Request Input Signal B

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Generic OBD-II
P2549

Torque Management Request Input Signal B Range/Performance

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Generic OBD-II
P254A

PTO Speed Selector Sensor/Switch 1 Circuit/Open

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Generic OBD-II
P254B

PTO Speed Selector Sensor/Switch 1 Range/Performance

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Generic OBD-II
P254C

PTO Speed Selector Sensor/Switch 1 Circuit Low

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Generic OBD-II
P254D

PTO Speed Selector Sensor/Switch 1 Circuit High

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Generic OBD-II
P254E

PTO Speed Selector Sensor/Switch 1 Circuit Intermittent/Erratic

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Generic OBD-II
P254F

Engine Hood Switch Circuit

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Generic OBD-II
P2550

Torque Management Request Input Signal B Low

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Generic OBD-II
P2551

Torque Management Request Input Signal B High

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Generic OBD-II
P2552

Throttle/Fuel Inhibit A Circuit

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Generic OBD-II
P2553

Throttle/Fuel Inhibit A Circuit Range/Performance

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Generic OBD-II
P2554

Throttle/Fuel Inhibit A Circuit Low

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Generic OBD-II
P2555

Throttle/Fuel Inhibit A Circuit High

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Generic OBD-II
P2556

Engine Coolant Level Sensor/Switch Circuit

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Generic OBD-II
P2557

Engine Coolant Level Sensor/Switch Circuit Range/Performance

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Generic OBD-II
P2558

Engine Coolant Level Sensor/Switch Circuit Low

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Generic OBD-II
P2559

Engine Coolant Level Sensor/Switch Circuit High

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Generic OBD-II
P255A

PTO Speed Selector Sensor/Switch 2 Circuit/Open

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Generic OBD-II
P255B

PTO Speed Selector Sensor/Switch 2 Range/Performance

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Generic OBD-II
P255C

PTO Speed Selector Sensor/Switch 2 Circuit Low

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Generic OBD-II
P255D

PTO Speed Selector Sensor/Switch 2 Circuit High

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Generic OBD-II
P255E

PTO Speed Selector Sensor/Switch 2 Circuit Intermittent/Erratic

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Generic OBD-II
P255F

A/C Request A Circuit Range/Performance

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Generic OBD-II
P2560

Engine Coolant Level Low

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Generic OBD-II
P2561

A/C Control Module Requested MIL Illumination

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Generic OBD-II
P2562

Turbocharger Boost Control Position Sensor A Circuit

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Generic OBD-II
P2563

Turbocharger Boost Control Position Sensor A Circuit Range/Performance

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Generic OBD-II
P2564

Turbocharger Boost Control Position Sensor A Circuit Low

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Generic OBD-II
P2565

Turbocharger Boost Control Position Sensor A Circuit High

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Generic OBD-II
P2566

Turbocharger Boost Control Position Sensor A Circuit Intermittent

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Generic OBD-II
P2567

Direct Ozone Reduction Catalyst Temperature Sensor Circuit

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Generic OBD-II
P2568

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Range/Performance

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Generic OBD-II
P2569

Direct Ozone Reduction Catalyst Temperature Sensor Circuit Low

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Generic OBD-II
P256A

Engine Idle Speed Selector Sensor/Switch Circuit/Open

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Generic OBD-II
P256B

Engine Idle Speed Selector Sensor/Switch Range/Performance

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Generic OBD-II
P256C

Engine Idle Speed Selector Sensor/Switch Circuit Low

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Generic OBD-II
P256D

Engine Idle Speed Selector Sensor/Switch Circuit High

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Generic OBD-II
P256E

Engine Idle Speed Selector Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P256F

A/C Request B Circuit Range/Performance

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These are code references, not a list of confirmed faults on every vehicle. Read the source and applicability notes, then match the exact vehicle, year, engine and scan report.