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THE CODE DIRECTORY

Diagnostic code references — Page 20.

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

11,786 code references

Generic OBD-II
P04D5

Exhaust Brake Input Circuit Low

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Generic OBD-II
P04D6

Exhaust Brake Input Circuit High

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Generic OBD-II
P04D7

Exhaust Brake Input Circuit Intermittent/Erratic

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Generic OBD-II
P04D8

Excessive Time To Enter Closed Loop EGR Control

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Generic OBD-II
P04D9

Closed Loop EGR Control At Limit - Flow Too Low

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Generic OBD-II
P04DA

Closed Loop EGR Control At Limit - Flow Too High

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Generic OBD-II
P04DB

Crankcase Ventilation System Disconnected

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Generic OBD-II
P04DC

Fuel Fill Door Position Sensor/Switch Circuit Range/Performance

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Generic OBD-II
P04DD

Cold Start EGR A Flow Insufficient Detected

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Generic OBD-II
P04DE

Cold Start EGR A Flow Excessive Detected

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Generic OBD-II
P04DF

EVAP System Purge Control Valve A Performance/Stuck Open

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Generic OBD-II
P04E0

EVAP System Purge Control Valve A Stuck Closed

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Generic OBD-II
P04E1

Crankcase Ventilation Hose Connection Sensor Circuit

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Generic OBD-II
P04E2

Crankcase Ventilation Hose Connection Sensor Circuit Low

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Generic OBD-II
P04E3

Crankcase Ventilation Hose Connection Sensor Circuit High

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Generic OBD-II
P04E4

Crankcase Ventilation Hose Connection Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P04E5

EGR Temperature Sensor D Circuit

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Generic OBD-II
P04E6

EGR Temperature Sensor D Circuit Range/Performance

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Generic OBD-II
P04E7

EGR Temperature Sensor D Circuit Low

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Generic OBD-II
P04E8

EGR Temperature Sensor D Circuit High

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Generic OBD-II
P04E9

EGR Temperature Sensor D Circuit Intermittent/Erratic

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Generic OBD-II
P04EA

EVAP System Small Leak Detected - Fuel Tank Side

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Generic OBD-II
P04EB

EVAP System Small Leak Detected - Fresh Air Side

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Generic OBD-II
P04EC

EVAP System Large Leak Detected - Fuel Tank Side

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Generic OBD-II
P04ED

EVAP System Large Leak Detected - Fresh Air Side

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Generic OBD-II
P04EE

EVAP System Very Small Leak Detected - Fuel Tank Side

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Generic OBD-II
P04EF

EVAP System Very Small Leak Detected - Fresh Air Side

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Generic OBD-II
P04F0

EVAP System High Load Purge Line A Performance

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Generic OBD-II
P04F1

EVAP System Purge Line Performance

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Generic OBD-II
P04F2

Catalyst Heater Supply Voltage Bank 1

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Generic OBD-II
P04F3

Catalyst Heater Supply Voltage Bank 2

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Generic OBD-II
P04F4

Catalyst Heater Circuit Low Bank 1

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Generic OBD-II
P04F5

Catalyst Heater Circuit Low Bank 2

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Generic OBD-II
P04F6

Catalyst Heater Circuit High Bank 1

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Generic OBD-II
P04F7

Catalyst Heater Circuit High Bank 2

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Generic OBD-II
P04F8

Catalyst Heater Circuit Intermittent Bank 1

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Generic OBD-II
P04F9

Catalyst Heater Circuit Intermittent Bank 2

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Generic OBD-II
P04FA

EGR A Control Temperature Too High

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Generic OBD-II
P04FB

Crankcase Ventilation Hose Connection Sensor Range/Performance

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Generic OBD-II
P04FC

Crankcase Ventilation System Performance

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Generic OBD-II
P04FD

EGR Actuator A Control Processor Performance

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Generic OBD-II
P04FE

Catalyst Heater Circuit Performance Bank 1

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Generic OBD-II
P04FF

Catalyst Heater Circuit Performance Bank 2

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Generic OBD-II
P0500

Vehicle Speed Sensor A Circuit

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Generic OBD-II
P0501

Vehicle Speed Sensor A Circuit Range/Performance

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Generic OBD-II
P0502

Vehicle Speed Sensor A Circuit Low

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Generic OBD-II
P0503

Vehicle Speed Sensor A Circuit Intermittent/Erratic/High

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Generic OBD-II
P0504

Brake Switch A/B Correlation

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Generic OBD-II
P0505

Idle Control System

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Generic OBD-II
P0506

Idle Control System RPM - Lower Than Expected

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Generic OBD-II
P0507

Idle Control System RPM - Higher Than Expected

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Generic OBD-II
P0508

Idle Air Control System Circuit Low

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Generic OBD-II
P0509

Idle Air Control System Circuit High

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Generic OBD-II
P050A

Cold Start Idle Control System Performance

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Generic OBD-II
P050B

Cold Start Ignition Timing Performance

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Generic OBD-II
P050C

Cold Start Engine Coolant Temperature Performance

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Generic OBD-II
P050D

Cold Start Rough Idle

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Generic OBD-II
P050E

Cold Start Engine Exhaust Temperature Too Low

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Generic OBD-II
P050F

Brake Assist Vacuum Too Low

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Generic OBD-II
P0510

Closed Throttle Position Switch

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Generic OBD-II
P0511

Idle Air Control Circuit

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Generic OBD-II
P0512

Starter Request Circuit

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Generic OBD-II
P0513

Incorrect Immobilizer Key

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Generic OBD-II
P0514

Battery Temperature Sensor Circuit Range/Performance

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Generic OBD-II
P0515

Battery Temperature Sensor Circuit

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Generic OBD-II
P0516

Battery Temperature Sensor Circuit Low

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Generic OBD-II
P0517

Battery Temperature Sensor Circuit High

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Generic OBD-II
P0518

Idle Air Control Circuit Intermittent

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Generic OBD-II
P0519

Idle Air Control System Performance

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Generic OBD-II
P051A

Crankcase Pressure Sensor A Circuit

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Generic OBD-II
P051B

Crankcase Pressure Sensor A Circuit Range/Performance

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Generic OBD-II
P051C

Crankcase Pressure Sensor A Circuit Low

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Generic OBD-II
P051D

Crankcase Pressure Sensor A Circuit High

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Generic OBD-II
P051E

Crankcase Pressure Sensor A Circuit Intermittent/Erratic

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Generic OBD-II
P051F

PCV Filter Restriction

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Generic OBD-II
P0520

Engine Oil Pressure Sensor/Switch A Circuit

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Generic OBD-II
P0521

Engine Oil Pressure Sensor/Switch A Range/Performance

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Generic OBD-II
P0522

Engine Oil Pressure Sensor/Switch A Low

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Generic OBD-II
P0523

Engine Oil Pressure Sensor/Switch A High

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Generic OBD-II
P0524

Engine Oil Pressure Too Low

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Generic OBD-II
P0525

Cruise Control Servo Control Circuit Range/Performance

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Generic OBD-II
P0526

Fan Speed Sensor Circuit

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Generic OBD-II
P0527

Fan Speed Sensor Circuit Range/Performance

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Generic OBD-II
P0528

Fan Speed Sensor Circuit No Signal

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Generic OBD-II
P0529

Fan Speed Sensor Circuit Intermittent

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Generic OBD-II
P052A

Cold Start A Camshaft Position Timing Over-Advanced Bank 1

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Generic OBD-II
P052B

Cold Start A Camshaft Position Timing Over-Retarded Bank 1

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Generic OBD-II
P052C

Cold Start A Camshaft Position Timing Over-Advanced Bank 2

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Generic OBD-II
P052D

Cold Start A Camshaft Position Timing Over-Retarded Bank 2

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Generic OBD-II
P052E

PCV Regulator Valve Performance

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Generic OBD-II
P052F

Glow Plug Control Module 1 System Voltage

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Generic OBD-II
P0530

A/C Refrigerant Pressure Sensor A Circuit

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Generic OBD-II
P0531

A/C Refrigerant Pressure Sensor A Circuit Range/Performance

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Generic OBD-II
P0532

A/C Refrigerant Pressure Sensor A Circuit Low

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Generic OBD-II
P0533

A/C Refrigerant Pressure Sensor A Circuit High

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Generic OBD-II
P0534

A/C Refrigerant Charge Loss

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Generic OBD-II
P0535

A/C Evaporator Temperature Sensor Circuit

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Generic OBD-II
P0536

A/C Evaporator Temperature Sensor Circuit Range/Performance

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Generic OBD-II
P0537

A/C Evaporator Temperature Sensor Circuit Low

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Generic OBD-II
P0538

A/C Evaporator Temperature Sensor Circuit High

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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.