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THE CODE DIRECTORY

Diagnostic code references — Page 72.

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

11,786 code references

Generic OBD-II
P20C0

Reductant Heater B Control Circuit High

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Generic OBD-II
P20C1

Reductant Heater C Control Circuit/Open

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Generic OBD-II
P20C2

Reductant Heater C Control Circuit Performance

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Generic OBD-II
P20C3

Reductant Heater C Control Circuit Low

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Generic OBD-II
P20C4

Reductant Heater C Control Circuit High

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Generic OBD-II
P20C5

Reductant Heater D Control Circuit/Open

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Generic OBD-II
P20C6

Reductant Heater D Control Circuit Performance

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Generic OBD-II
P20C7

Reductant Heater D Control Circuit Low

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Generic OBD-II
P20C8

Reductant Heater D Control Circuit High

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Generic OBD-II
P20C9

Reductant Control Module Requested MIL Illumination

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Generic OBD-II
P20CA

Reductant Injection Air Pressure Leakage

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Generic OBD-II
P20CB

Exhaust Aftertreatment Fuel Injector A Control Circuit/Open

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Generic OBD-II
P20CC

Exhaust Aftertreatment Fuel Injector A Control Performance

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Generic OBD-II
P20CD

Exhaust Aftertreatment Fuel Injector A Control Circuit Low

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Generic OBD-II
P20CE

Exhaust Aftertreatment Fuel Injector A Control Circuit High

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Generic OBD-II
P20CF

Exhaust Aftertreatment Fuel Injector A Stuck Open

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Generic OBD-II
P20D0

Exhaust Aftertreatment Fuel Injector A Stuck Closed

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Generic OBD-II
P20D1

Exhaust Aftertreatment Fuel Injector B Control Circuit/Open

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Generic OBD-II
P20D2

Exhaust Aftertreatment Fuel Injector B Control Performance

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Generic OBD-II
P20D3

Exhaust Aftertreatment Fuel Injector B Control Circuit Low

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Generic OBD-II
P20D4

Exhaust Aftertreatment Fuel Injector B Control Circuit High

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Generic OBD-II
P20D5

Exhaust Aftertreatment Fuel Injector B Stuck Open

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Generic OBD-II
P20D6

Exhaust Aftertreatment Fuel Injector B Stuck Closed

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Generic OBD-II
P20D7

Exhaust Aftertreatment Fuel Supply Control Circuit/Open

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Generic OBD-II
P20D8

Exhaust Aftertreatment Fuel Supply Control Performance

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Generic OBD-II
P20D9

Exhaust Aftertreatment Fuel Supply Control Circuit Low

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Generic OBD-II
P20DA

Exhaust Aftertreatment Fuel Supply Control Circuit High

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Generic OBD-II
P20DB

Exhaust Aftertreatment Fuel Supply Control Stuck Open

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Generic OBD-II
P20DC

Exhaust Aftertreatment Fuel Supply Control Stuck Closed

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Generic OBD-II
P20DD

Exhaust Aftertreatment Fuel Pressure Sensor Circuit

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Generic OBD-II
P20DE

Exhaust Aftertreatment Fuel Pressure Sensor Circuit Range/Performance

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Generic OBD-II
P20DF

Exhaust Aftertreatment Fuel Pressure Sensor Circuit Low

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Generic OBD-II
P20E0

Exhaust Aftertreatment Fuel Pressure Sensor Circuit High

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Generic OBD-II
P20E1

Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

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Generic OBD-II
P20E2

Exhaust Gas Temperature Sensor 1/2 Correlation Bank 1

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Generic OBD-II
P20E3

Exhaust Gas Temperature Sensor 1/3 Correlation Bank 1

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Generic OBD-II
P20E4

Exhaust Gas Temperature Sensor 2/3 Correlation Bank 1

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Generic OBD-II
P20E5

Exhaust Gas Temperature Sensor 1/2 Correlation Bank 2

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Generic OBD-II
P20E6

Reductant Injection Air Pressure Too Low

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Generic OBD-II
P20E7

Reductant Injection Air Pressure Too High

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Generic OBD-II
P20E8

Reductant Pressure Too Low

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Generic OBD-II
P20E9

Reductant Pressure Too High

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Generic OBD-II
P20EA

Reductant Control Module Power Relay De-Energized Performance - Too Early

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Generic OBD-II
P20EB

Reductant Control Module Power Relay De-Energized Performance - Too Late

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Generic OBD-II
P20EC

SCR NOx Catalyst - Over Temperature Bank 1

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Generic OBD-II
P20ED

SCR NOx Pre-Catalyst - Over Temperature Bank 1

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Generic OBD-II
P20EE

SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 1

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Generic OBD-II
P20EF

SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 1

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Generic OBD-II
P20F0

SCR NOx Catalyst - Over Temperature Bank 2

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Generic OBD-II
P20F1

SCR NOx Pre-Catalyst - Over Temperature Bank 2

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Generic OBD-II
P20F2

SCR NOx Catalyst Efficiency Below Threshold Bank 2

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Generic OBD-II
P20F3

SCR NOx Pre- Catalyst Efficiency Below Threshold Bank 2

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Generic OBD-II
P20F4

Reductant Consumption Too Low

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Generic OBD-II
P20F5

Reductant Consumption Too High

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Generic OBD-II
P20F6

Reductant Injection Valve Stuck Open Bank 1 Unit 1

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Generic OBD-II
P20F7

Reductant Injection Valve Stuck Open Bank 2 Unit 1

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Generic OBD-II
P20F8

Intake Manifold Runner Control Circuit Performance Bank 1

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Generic OBD-II
P20F9

Intake Manifold Runner Control Circuit Performance Bank 2

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Generic OBD-II
P20FA

Reductant Pump B Control Circuit/Open

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Generic OBD-II
P20FB

Reductant Pump B Control Performance/Stuck Off

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Generic OBD-II
P20FC

Reductant Pump B Control Circuit Low

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Generic OBD-II
P20FD

Reductant Pump B Control Circuit High

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Generic OBD-II
P20FE

Reductant Metering Unit 1 Performance

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Generic OBD-II
P20FF

Reductant Control Module Performance

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Generic OBD-II
P2100

Throttle Actuator A Control Motor Circuit/Open

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Generic OBD-II
P2101

Throttle Actuator A Control Motor Circuit Range/Performance

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Generic OBD-II
P2102

Throttle Actuator A Control Motor Circuit Low

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Generic OBD-II
P2103

Throttle Actuator A Control Motor Circuit High

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Generic OBD-II
P2104

Throttle Actuator Control System - Forced Idle

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Generic OBD-II
P2105

Throttle Actuator Control System - Forced Engine Shutdown

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Generic OBD-II
P2106

Throttle Actuator Control System - Forced Limited Power

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Generic OBD-II
P2107

Throttle Actuator A Control Module Processor

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Generic OBD-II
P2108

Throttle Actuator A Control Module Performance

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Generic OBD-II
P2109

Throttle/Pedal Position Sensor A Minimum Stop Performance

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Generic OBD-II
P210A

Throttle Actuator B Control Motor Circuit/Open

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Generic OBD-II
P210B

Throttle Actuator B Control Motor Circuit Range/Performance

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Generic OBD-II
P210C

Throttle Actuator B Control Motor Circuit Low

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Generic OBD-II
P210D

Throttle Actuator B Control Motor Circuit High

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Generic OBD-II
P210E

Throttle/Pedal Position Sensor/Switch C/F Voltage Correlation

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Generic OBD-II
P210F

Throttle Actuator B Control System - Forced Limited RPM

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Generic OBD-II
P2110

Throttle Actuator A Control System - Forced Limited RPM

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Generic OBD-II
P2111

Throttle Actuator A Control System - Stuck Open

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Generic OBD-II
P2112

Throttle Actuator A Control System - Stuck Closed

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Generic OBD-II
P2113

Throttle/Pedal Position Sensor B Minimum Stop Performance

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Generic OBD-II
P2114

Throttle/Pedal Position Sensor C Minimum Stop Performance

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Generic OBD-II
P2115

Throttle/Pedal Position Sensor D Minimum Stop Performance

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Generic OBD-II
P2116

Throttle/Pedal Position Sensor E Minimum Stop Performance

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Generic OBD-II
P2117

Throttle/Pedal Position Sensor F Minimum Stop Performance

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Generic OBD-II
P2118

Throttle Actuator A Control Motor Current Range/Performance

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Generic OBD-II
P2119

Throttle Actuator A Control Throttle Body Range/Performance

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Generic OBD-II
P211A

Throttle Actuator B Control System - Stuck Open

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Generic OBD-II
P211B

Throttle Actuator B Control System - Stuck Close

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Generic OBD-II
P211C

Throttle Actuator B Control Motor Current Range/Performance

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Generic OBD-II
P211D

Throttle Actuator B Control Throttle Body Range/Performance

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Generic OBD-II
P211E

Throttle Actuator B Control Module Processor

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Generic OBD-II
P211F

Throttle Actuator B Control Module Performance

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Generic OBD-II
P2120

Throttle/Pedal Position Sensor/Switch D Circuit

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Generic OBD-II
P2121

Throttle/Pedal Position Sensor/Switch D Circuit Range/Performance

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Generic OBD-II
P2122

Throttle/Pedal Position Sensor/Switch D Circuit Low

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Generic OBD-II
P2123

Throttle/Pedal Position Sensor/Switch D 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.