THE CODE DIRECTORY
Diagnostic code references — Page 80.
Browse canonical reference entries. Each definition keeps its own source and vehicle-applicability limits.
Generic OBD-II
P23E0
Cylinder 4 Fuel Heater Performance
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Generic OBD-II
P23E1
EGR C Control Circuit/Open
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Generic OBD-II
P23E2
EGR C Control Circuit Performance
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Generic OBD-II
P23E3
EGR C Control Circuit Low
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Generic OBD-II
P23E4
EGR C Control Circuit High
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Generic OBD-II
P23E5
EGR C Control Stuck Open
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Generic OBD-II
P23E6
EGR C Control Stuck Closed
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Generic OBD-II
P23E7
EGR C Flow Insufficient Detected
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Generic OBD-II
P23E8
EGR C Flow Excessive Detected
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Generic OBD-II
P23E9
Camshaft A Position Signal Output Circuit/Open Bank 2
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Generic OBD-II
P23EA
Camshaft A Position Signal Output Circuit Low Bank 2
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Generic OBD-II
P23EB
Camshaft A Position Signal Output Circuit High Bank 2
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Generic OBD-II
P23EC
Camshaft B Position Signal Output Circuit/Open Bank 1
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Generic OBD-II
P23ED
Camshaft B Position Signal Output Circuit Low Bank 1
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Generic OBD-II
P23EE
Camshaft B Position Signal Output Circuit High Bank 1
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Generic OBD-II
P23EF
Camshaft B Position Signal Output Circuit/Open Bank 2
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Generic OBD-II
P23F0
Camshaft B Position Signal Output Circuit Low Bank 2
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Generic OBD-II
P23F1
Camshaft B Position Signal Output Circuit High Bank 2
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Generic OBD-II
P23F2
Cylinder 1 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F3
Cylinder 2 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F4
Cylinder 3 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F5
Cylinder 4 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F6
Cylinder 5 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F7
Cylinder 6 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F8
Cylinder 7 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23F9
Cylinder 8 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23FA
Cylinder 9 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23FB
Cylinder 10 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23FC
Cylinder 11 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23FD
Cylinder 12 Injector B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23FE
Bank 1 System B Air-Fuel Ratio Imbalance
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Generic OBD-II
P23FF
Bank 2 System B Air-Fuel Ratio Imbalance
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Generic OBD-II
P2400
EVAP leak-detection pump control circuit is diagnosed open
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Generic OBD-II
P2401
EVAP leak-detection pump output has a low-circuit fault
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Generic OBD-II
P2402
EVAP pump driver detects unwanted power during its on command
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Generic OBD-II
P2403
low leak-pump sense feedback must persist in Audi's CTUA monitor
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Generic OBD-II
P2404
leak-pump feedback depends on vacuum, power and purge sealing
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Generic OBD-II
P2405
EVAP System Leak Detection Pump Sense Circuit Low
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Generic OBD-II
P2406
EVAP System Leak Detection Pump Sense Circuit High
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Generic OBD-II
P2407
Volkswagen EVAP pump-current instability
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Generic OBD-II
P2408
Fuel Cap Sensor/Switch Circuit
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Generic OBD-II
P2409
Fuel Cap Sensor/Switch Circuit Range/Performance
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Generic OBD-II
P240A
Volkswagen leak-detection pump heater open-circuit monitor
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Generic OBD-II
P240B
Volkswagen leak-detection pump heater control low
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Generic OBD-II
P240C
Volkswagen leak-detection pump heater high-current classification
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Generic OBD-II
P240D
Alternative Fuel Low Pressure System Leak
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Generic OBD-II
P240E
Alternative Fuel High Pressure System Leak
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Generic OBD-II
P240F
EGR slow response is evaluated using changing air-mass targets
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Generic OBD-II
P2410
Fuel Cap Sensor/Switch Circuit Low
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Generic OBD-II
P2411
Fuel Cap Sensor/Switch Circuit High
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Generic OBD-II
P2412
Fuel Cap Sensor/Switch Circuit Intermittent/Erratic
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Generic OBD-II
P2413
Volkswagen CJAA EGR and fuel-adaptation limits
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Generic OBD-II
P2414
front oxygen-signal limits depend on the selected gain characteristic
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Generic OBD-II
P2415
bank 2 front-oxygen feedback exceeds the CTUA signal-range criterion
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Generic OBD-II
P2416
O2 Sensor Signals Swapped Bank 1 Sensor 2/Bank 1 Sensor 3
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Generic OBD-II
P2417
O2 Sensor Signals Swapped Bank 2 Sensor 2/Bank 2 Sensor 3
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Generic OBD-II
P2418
EVAP switching-valve control circuit has an open signature
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Generic OBD-II
P2419
EVAP switching-valve circuit-low row contains conflicting fault wording
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Generic OBD-II
P241A
O2 Sensor Signals Swapped Bank 1 Sensor 1/Bank 1 Sensor 2
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Generic OBD-II
P241B
O2 Sensor Signals Swapped Bank 2 Sensor 1/Bank 2 Sensor 2
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Generic OBD-II
P241C
Throttle Actuator Control System - Ice Blockage Bank 2
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Generic OBD-II
P241D
SCR Inducement - Forced Engine Shutdown
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Generic OBD-II
P241E
Reductant Heater Coolant Control Valve Stuck Closed
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Generic OBD-II
P241F
low-pressure EGR cooler efficiency below its threshold
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Generic OBD-II
P2420
EVAP switching-valve driver detects a short to power
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Generic OBD-II
P2421
EVAP System Vent Valve Stuck Open
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Generic OBD-II
P2422
Sportage vent restriction after the valve tests correctly
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Generic OBD-II
P2423
HC Adsorption Catalyst Efficiency Below Threshold Bank 1
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Generic OBD-II
P2424
HC Adsorption Catalyst Efficiency Below Threshold Bank 2
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Generic OBD-II
P2425
An EGR cooling-valve open-load report is an actuator-circuit finding
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Generic OBD-II
P2426
A low EGR cooling-valve circuit is distinct from an open-load fault
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Generic OBD-II
P2427
A high EGR cooling-valve circuit needs its own electrical evidence
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Generic OBD-II
P2428
exhaust protection checks both temperatures and temperature differences
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Generic OBD-II
P2429
Exhaust Gas Temperature Too High Bank 2
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Generic OBD-II
P242A
Ford exhaust-temperature sensor 3 model-plausibility fault
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Generic OBD-II
P242B
exhaust temperature sensor 3 fails to respond after a soak
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Generic OBD-II
P242C
exhaust temperature sensor 3 below its electrical range
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Generic OBD-II
P242D
exhaust temperature sensor 3 above its electrical range
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Generic OBD-II
P242E
exhaust temperature sensor 3 changes implausibly fast
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Generic OBD-II
P242F
DPF restriction and software must match the installed filter generation
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Generic OBD-II
P2430
AIR pressure can be stuck inside its electrical range
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Generic OBD-II
P2431
secondary-air pressure is compared before engine cranking
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Generic OBD-II
P2432
Low secondary-air pressure signal and why the voltage matters
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Generic OBD-II
P2433
High secondary-air pressure signal is not proof of high airflow
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Generic OBD-II
P2434
AIR System Air Flow/Pressure Sensor Circuit Intermittent/Erratic Bank 1
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Generic OBD-II
P2435
Bank 2 AIR pressure can fail while staying within range
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Generic OBD-II
P2436
Bank 2 AIR pressure rationality depends on pump state
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Generic OBD-II
P2437
Bank 2 AIR pressure low voltage relative to its reference
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Generic OBD-II
P2438
Bank 2 AIR pressure high voltage and the 94% boundary
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Generic OBD-II
P2439
AIR System Air Flow/Pressure Sensor Circuit Intermittent/Erratic Bank 2
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Generic OBD-II
P243A
Particulate Filter Restriction - Ash Accumulation Bank 2
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Generic OBD-II
P243B
Bank2 GPF restriction monitoring needs warm, sustained exhaust flow
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Generic OBD-II
P243C
Repeatedly short diesel particulate-filter regeneration intervals
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Generic OBD-II
P243D
Particulate Filter Regeneration Duration Bank 2
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Generic OBD-II
P243E
Particulate Filter Regeneration Incomplete Bank 2
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Generic OBD-II
P243F
Particulate Filter Restriction - Soot Accumulation Too High Bank 2
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Generic OBD-II
P2440
AIR valve stuck-open evidence comes from a closed-valve phase
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Generic OBD-II
P2441
AIR System Switching Valve Stuck Closed Bank 1
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Generic OBD-II
P2442
a bank 2 air-valve stuck-open judgment can use lambda correction
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Generic OBD-II
P2443
AIR valve stuck-closed code within a pressure-flow check
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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.