P CODE FAMILY
Powertrain code references — Page 76.
Engine, transmission and powertrain diagnostic references. Exact vehicle and module context still matters.
Generic OBD-II
P24EB
NH3 Sensor Supply Voltage Circuit Low
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Generic OBD-II
P24EC
NH3 Sensor Supply Voltage Circuit High
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Generic OBD-II
P24ED
NH3 Sensor Calibration Memory
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Generic OBD-II
P24EE
NH3 Sensor Processor Performance
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Generic OBD-II
P24EF
Control Module Wake-up Circuit/Open
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Generic OBD-II
P24F0
Control Module Wake-up Circuit Low
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Generic OBD-II
P24F1
Control Module Wake-up Circuit High
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Generic OBD-II
P24F2
EGR Temperature/Charge Air Cooler Temperature Correlation
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Generic OBD-II
P24F3
Reductant Tank Temperature/Fuel Temperature Correlation
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Generic OBD-II
P24F4
NOx Sensor Delayed Response - High to Low Bank 1 Sensor 1
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Generic OBD-II
P24F5
NOx Sensor Delayed Response - High to Low Bank 1 Sensor 2
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Generic OBD-II
P24F6
Exhaust Aftertreatment Fuel Air Purge Valve Stuck Open
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Generic OBD-II
P24F7
Exhaust Aftertreatment Fuel Air Purge Valve Stuck Closed
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Generic OBD-II
P24F8
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit
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Generic OBD-II
P24F9
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Range/Performance
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Generic OBD-II
P24FA
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit Low
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Generic OBD-II
P24FB
Exhaust Aftertreatment Fuel Air Purge Valve Control Circuit High
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Generic OBD-II
P24FC
Particulate Matter Sensor Heater Control Circuit Driver Current/Temperature Too High
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Generic OBD-II
P24FD
Particulate Filter A Incorrect
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Generic OBD-II
P24FE
SCR Catalyst Incorrect
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Generic OBD-II
P24FF
Reductant Temperature Too High
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Generic OBD-II
P2500
Generator Lamp/L-Terminal Circuit Low
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Generic OBD-II
P2501
Generator Lamp/L-Terminal Circuit High
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Generic OBD-II
P2502
Charging System Voltage
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Generic OBD-II
P2503
Charging System Voltage Low
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Generic OBD-II
P2504
Charging System Voltage High
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Generic OBD-II
P2505
ECM/PCM Power Input Signal
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Generic OBD-II
P2506
ECM/PCM Power Input Signal Range/Performance
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Generic OBD-II
P2507
ECM/PCM Power Input Signal Low
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Generic OBD-II
P2508
ECM/PCM Power Input Signal High
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Generic OBD-II
P2509
ECM/PCM Power Input Signal Intermittent
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Generic OBD-II
P250A
Engine Oil Level Sensor Circuit
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Generic OBD-II
P250B
Engine Oil Level Sensor Circuit Range/Performance
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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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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.