THE CODE DIRECTORY
Diagnostic code references — Page 82.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
P24A8
EGR Cooler Coolant Pump Performance/Stuck Off
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Generic OBD-II
P24A9
EGR Cooler Coolant Pump Control Circuit Low
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Generic OBD-II
P24AA
EGR Cooler Coolant Pump Control Circuit High
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Generic OBD-II
P24AB
EGR Cooler Coolant Pump Stuck On
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Generic OBD-II
P24AC
EGR Cooler Coolant Pump Feedback Circuit Low
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Generic OBD-II
P24AD
EGR Cooler Coolant Pump Feedback Circuit High
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Generic OBD-II
P24AE
Particulate-sensor current stays too high after sensor regeneration
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Generic OBD-II
P24AF
particulate sensor state feedback disagrees with its command
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Generic OBD-II
P24B0
particulate sensor electrode response is too small
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Generic OBD-II
P24B1
particulate sensor electrode signal shorted to power
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Generic OBD-II
P24B2
Particulate Matter Sensor Circuit Intermittent
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Generic OBD-II
P24B3
The particulate-sensor heater is checked while regeneration heating is on
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Generic OBD-II
P24B4
Unexpected heater voltage appears while the particulate sensor is measuring
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Generic OBD-II
P24B5
particulate sensor heater reports a ground-short condition
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Generic OBD-II
P24B6
particulate sensor heater remains electrically active when off
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Generic OBD-II
P24B7
Particulate-sensor heater resistance changes with temperature
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Generic OBD-II
P24B8
EVAP System Leak Detection Pump Pressure Sensor Circuit
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Generic OBD-II
P24B9
EVAP pressure correlation compares the vented system with ambient pressure
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Generic OBD-II
P24BA
Leak-detection pressure sensor voltage is below its electrical range
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Generic OBD-II
P24BB
Leak-detection pressure sensor voltage exceeds its upper boundary
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Generic OBD-II
P24BC
EVAP System Leak Detection Pump Pressure Sensor Circuit Intermittent
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Generic OBD-II
P24BD
EVAP System Leak Detection Pump Switching Valve Control Circuit/Open
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Generic OBD-II
P24BE
EVAP System Leak Detection Pump Switching Valve Control Circuit Low
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Generic OBD-II
P24BF
EVAP System Leak Detection Pump Switching Valve Control Circuit High
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Generic OBD-II
P24C0
EVAP System Leak Detection Pump Switching Valve Stuck On
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Generic OBD-II
P24C1
EVAP System Leak Detection Pump Switching Valve Performance/Stuck Off
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Generic OBD-II
P24C2
Super Duty exhaust-temperature faults and the PCM software case
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Generic OBD-II
P24C3
Exhaust Gas Temperature Measurement System - Multiple Sensor Correlation Bank 2
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Generic OBD-II
P24C4
An EGR bypass learning limit is not the normal travel limit
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Generic OBD-II
P24C5
EGR Cooler Bypass Position Sensor Exceeded Learning Limit Bank 2
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Generic OBD-II
P24C6
Particulate-sensor temperature circuit faults use electrical limits
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Generic OBD-II
P24C7
particulate sensor temperature disagrees with its model
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Generic OBD-II
P24C8
Particulate Matter Sensor Temperature Circuit Low
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Generic OBD-II
P24C9
particulate sensor temperature circuit reports an electrical fault
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Generic OBD-II
P24CA
Particulate Matter Sensor Temperature Circuit Intermittent
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Generic OBD-II
P24CB
Reductant Tank Cap Switch Circuit
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Generic OBD-II
P24CC
Reductant Tank Cap Switch Circuit Range/Performance
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Generic OBD-II
P24CD
Reductant Tank Cap Switch Circuit Low
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Generic OBD-II
P24CE
Reductant Tank Cap Switch Circuit High
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Generic OBD-II
P24CF
Reductant Tank Cap Switch Circuit Intermittent/Erratic
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Generic OBD-II
P24D0
Particulate-sensor supply voltage is judged by voltage drop under heater demand
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Generic OBD-II
P24D1
particulate sensor regeneration does not achieve its thermal goal
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Generic OBD-II
P24D2
Reductant Heater A Sense Circuit
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Generic OBD-II
P24D3
Reductant Heater B Sense Circuit
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Generic OBD-II
P24D4
EGR Cooler Coolant Pump Feedback Circuit
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Generic OBD-II
P24D5
EVAP System Pressure Sensor/Switch B Circuit
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Generic OBD-II
P24D6
EVAP System Pressure Sensor/Switch B Circuit Range/Performance
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Generic OBD-II
P24D7
EVAP System Pressure Sensor/Switch B Circuit Low
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Generic OBD-II
P24D8
the EVAP pressure-sensor number may be misleading
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Generic OBD-II
P24D9
EVAP System Pressure Sensor/Switch B Circuit Intermittent
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Generic OBD-II
P24DA
particulate sensor heater response suggests an exhaust-sample problem
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Generic OBD-II
P24DB
Reductant Purge Control Valve B Circuit /Open
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Generic OBD-II
P24DC
Reductant Purge Control Valve B Performance
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Generic OBD-II
P24DD
Reductant Purge Control Valve B Circuit Low
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Generic OBD-II
P24DE
Reductant Purge Control Valve B Circuit High
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Generic OBD-II
P24DF
Reductant Purge Control Valve B Stuck Open
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Generic OBD-II
P24E0
Reductant Purge Control Valve B Stuck Closed
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Generic OBD-II
P24E1
NH3 Sensor Circuit
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Generic OBD-II
P24E2
NH3 Sensor Circuit Range/Performance
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Generic OBD-II
P24E3
NH3 Sensor Circuit Low
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Generic OBD-II
P24E4
NH3 Sensor Circuit High
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Generic OBD-II
P24E5
NH3 Sensor Circuit Intermittent/Erratic
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Generic OBD-II
P24E6
NH3 Sensor Heater Circuit/Open
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Generic OBD-II
P24E7
NH3 Sensor Heater Circuit Low
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Generic OBD-II
P24E8
NH3 Sensor Heater Circuit High
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Generic OBD-II
P24E9
NH3 Sensor Heater Circuit Performance
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Generic OBD-II
P24EA
NH3 Sensor Supply Voltage Circuit
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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 output is open in its off state
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Generic OBD-II
P24F0
Wake-up output voltage is low during an on command
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Generic OBD-II
P24F1
Wake-up circuit remains high with the command off
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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
An incorrect SCR catalyst code uses cumulative conversion evidence
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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 fault with several hybrid battery triggers
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Generic OBD-II
P2503
Low voltage at a Mazda M Hybrid charging-system node
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Generic OBD-II
P2504
High voltage across the hybrid charging network
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Generic OBD-II
P2505
Interrupted permanent ECM supply affects engine-off timing
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Generic OBD-II
P2506
ECM/PCM Power Input Signal Range/Performance
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Generic OBD-II
P2507
Mazda transport-mode starts can leave a low-voltage history code
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Generic OBD-II
P2508
Ford internal ECU five-volt supply is too high
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Generic OBD-II
P2509
ECM/PCM Power Input Signal Intermittent
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Generic OBD-II
P250A
Oil-level sensor errors can also result from excessive oil
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Generic OBD-II
P250B
Engine Oil Level Sensor 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.