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THE CODE DIRECTORY

Diagnostic code references — Page 19.

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

11,786 code references

Generic OBD-II
P0471

Exhaust Pressure Sensor A Circuit Range/Performance

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Generic OBD-II
P0472

Exhaust Pressure Sensor A Circuit Low

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Generic OBD-II
P0473

Exhaust Pressure Sensor A Circuit High

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Generic OBD-II
P0474

Exhaust Pressure Sensor A Circuit Intermittent/Erratic

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Generic OBD-II
P0475

Exhaust Pressure Control Valve A

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Generic OBD-II
P0476

Exhaust Pressure Control Valve A Range/Performance

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Generic OBD-II
P0477

Exhaust Pressure Control Valve A Low

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Generic OBD-II
P0478

Exhaust Pressure Control Valve A High

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Generic OBD-II
P0479

Exhaust Pressure Control Valve A Intermittent

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Generic OBD-II
P047A

Exhaust Pressure Sensor B Circuit

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Generic OBD-II
P047B

Exhaust Pressure Sensor B Circuit Range/Performance

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Generic OBD-II
P047C

Exhaust Pressure Sensor B Circuit Low

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Generic OBD-II
P047D

Exhaust Pressure Sensor B Circuit High

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Generic OBD-II
P047E

Exhaust Pressure Sensor B Circuit Intermittent/Erratic

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Generic OBD-II
P047F

Exhaust Pressure Control Valve A Stuck Open

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Generic OBD-II
P0480

Fan 1 Control Circuit

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Generic OBD-II
P0481

Fan 2 Control Circuit

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Generic OBD-II
P0482

Fan 3 Control Circuit

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Generic OBD-II
P0483

Fan Rationality Check

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Generic OBD-II
P0484

Fan Circuit Current High

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Generic OBD-II
P0485

Fan Power/Ground Circuit

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Generic OBD-II
P0486

EGR Sensor B Circuit

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Generic OBD-II
P0487

EGR Throttle Control Circuit A /Open

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Generic OBD-II
P0488

EGR Throttle Control Circuit A Range/Performance

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Generic OBD-II
P0489

EGR A Control Circuit Low

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Generic OBD-II
P048A

Exhaust Pressure Control Valve A Stuck Closed

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Generic OBD-II
P048B

Exhaust Pressure Control Valve A Position Sensor/Switch Circuit

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Generic OBD-II
P048C

Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Range/Performance

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Generic OBD-II
P048D

Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Low

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Generic OBD-II
P048E

Exhaust Pressure Control Valve A Position Sensor/Switch Circuit High

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Generic OBD-II
P048F

Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P0490

EGR A Control Circuit High

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Generic OBD-II
P0491

AIR System Insufficient Flow Bank 1

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Generic OBD-II
P0492

AIR System Insufficient Flow Bank 2

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Generic OBD-II
P0493

Fan Overspeed

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Generic OBD-II
P0494

Fan 1 Underspeed

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Generic OBD-II
P0495

Fan 1 Overspeed

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Generic OBD-II
P0496

EVAP System High Purge Flow

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Generic OBD-II
P0497

EVAP System Low Purge Flow

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Generic OBD-II
P0498

EVAP System Vent Valve Control Circuit Low

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Generic OBD-II
P0499

EVAP System Vent Valve Control Circuit High

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Generic OBD-II
P049A

EGR B Flow

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Generic OBD-II
P049B

EGR B Flow Insufficient Detected

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Generic OBD-II
P049C

EGR B Flow Excessive Detected

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Generic OBD-II
P049D

EGR A Control Position Exceeded Learning Limit

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Generic OBD-II
P049E

EGR B Control Position Exceeded Learning Limit

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Generic OBD-II
P049F

Exhaust Pressure Control Valve B

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Generic OBD-II
P04A0

Exhaust Pressure Control Valve B Range/Performance

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Generic OBD-II
P04A1

Exhaust Pressure Control Valve B Low

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Generic OBD-II
P04A2

Exhaust Pressure Control Valve B High

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Generic OBD-II
P04A3

Exhaust Pressure Control Valve B Intermittent

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Generic OBD-II
P04A4

Exhaust Pressure Control Valve B Stuck Open

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Generic OBD-II
P04A5

Exhaust Pressure Control Valve B Stuck Closed

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Generic OBD-II
P04A6

Exhaust Pressure Control Valve B Position Sensor/Switch Circuit

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Generic OBD-II
P04A7

Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Range/Performance

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Generic OBD-II
P04A8

Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Low

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Generic OBD-II
P04A9

Exhaust Pressure Control Valve B Position Sensor/Switch Circuit High

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Generic OBD-II
P04AA

Exhaust Pressure Control Valve B Position Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P04AB

EVAP System Purge Control Valve B Circuit/Open

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Generic OBD-II
P04AC

EVAP System Purge Control Valve B Circuit Low

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Generic OBD-II
P04AD

EVAP System Purge Control Valve B Circuit High

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Generic OBD-II
P04AE

EVAP System Purge Control Valve B Performance/Stuck Open

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Generic OBD-II
P04AF

EVAP System Purge Control Valve B Stuck Closed

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Generic OBD-II
P04B0

Refueling Vapor Control Valve Circuit/Open

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Generic OBD-II
P04B1

Refueling Vapor Control Valve Circuit Low

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Generic OBD-II
P04B2

Refueling Vapor Control Valve Circuit High

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Generic OBD-II
P04B3

Refueling Vapor Control Valve Stuck Performance/Stuck Open

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Generic OBD-II
P04B4

Refueling Vapor Control Valve Stuck Closed

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Generic OBD-II
P04B5

Fuel Fill Door Stuck Open

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Generic OBD-II
P04B6

Fuel Fill Door Stuck Closed

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Generic OBD-II
P04B7

Fuel Fill Door Position Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P04B8

Fuel Fill Door Position Sensor/Switch Circuit

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Generic OBD-II
P04B9

Fuel Fill Door Position Sensor/Switch Circuit Low

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Generic OBD-II
P04BA

Fuel Fill Door Position Sensor/Switch Circuit High

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Generic OBD-II
P04BB

Fuel Fill Door Lock Control Circuit/Open

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Generic OBD-II
P04BC

Fuel Fill Door Lock Control Range/Performance

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Generic OBD-II
P04BD

Fuel Fill Door Lock Control Circuit Low

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Generic OBD-II
P04BE

Fuel Fill Door Lock Control Circuit High

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Generic OBD-II
P04BF

Fuel Fill Door Unlock Control Circuit/Open

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Generic OBD-II
P04C0

Fuel Fill Door Unlock Control Range/Performance

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Generic OBD-II
P04C1

Fuel Fill Door Unlock Control Circuit Low

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Generic OBD-II
P04C2

Fuel Fill Door Unlock Control Circuit High

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Generic OBD-II
P04C3

Fuel Fill Door Lock Position Sensor/Switch Circuit

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Generic OBD-II
P04C4

Fuel Fill Door Lock Position Sensor/Switch Circuit Range/Performance

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Generic OBD-II
P04C5

Fuel Fill Door Lock Position Sensor/Switch Circuit Low

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Generic OBD-II
P04C6

Fuel Fill Door Lock Position Sensor/Switch Circuit High

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Generic OBD-II
P04C7

Fuel Fill Door Lock Position Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P04C8

Fuel Fill Door Open Request Sensor/Switch Circuit

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Generic OBD-II
P04C9

Fuel Fill Door Open Request Sensor/Switch Performance/Stuck Off

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Generic OBD-II
P04CA

Fuel Fill Door Open Request Sensor/Switch Circuit Low

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Generic OBD-II
P04CB

Fuel Fill Door Open Request Sensor/Switch Circuit High

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Generic OBD-II
P04CC

Fuel Fill Door Open Request Sensor/Switch Circuit Intermittent/Erratic

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Generic OBD-II
P04CD

Fuel Fill Door Open Request Sensor/Switch Stuck On

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Generic OBD-II
P04CE

EGR Temperature Sensor C Circuit

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Generic OBD-II
P04CF

EGR Temperature Sensor C Circuit Range/Performance

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Generic OBD-II
P04D0

EGR Temperature Sensor C Circuit Low

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Generic OBD-II
P04D1

EGR Temperature Sensor C Circuit High

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Generic OBD-II
P04D2

EGR Temperature Sensor C Circuit Intermittent/Erratic

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Generic OBD-II
P04D3

Exhaust Brake Input Circuit

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Generic OBD-II
P04D4

Exhaust Brake Input 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.