This section covers OBD-II codes P2000 to P2099, which are primarily related to Fuel and air metering and auxiliary emission control.
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| DTC Code | Description |
| P2000 | NOx Adsorber Efficiency Below Threshold Bank 1 |
| P2001 | NOx Adsorber Efficiency Below Threshold Bank 2 |
| P2002 | Diesel Particulate Filter Efficiency Below Threshold Bank 1 |
| P2003 | Diesel Particulate Filter Efficiency Below Threshold Bank 2 |
| P2004 | Intake Manifold Runner Control Stuck Open Bank 1 |
| P2005 | Intake Manifold Runner Control Stuck Open Bank 2 |
| P2006 | Intake Manifold Runner Control Stuck Closed Bank 1 |
| P2007 | Intake Manifold Runner Control Stuck Closed Bank 2 |
| P2008 | Intake Manifold Runner Control Circuit/Open Bank 1 |
| P2009 | Intake Manifold Runner Control Circuit Low Bank 1 |
| P200A | Intake Manifold Runner Performance Bank 1 |
| P200B | Intake Manifold Runner Performance Bank 2 |
| P200C | Diesel Particulate Filter Over Temperature Bank 1 |
| P200D | Diesel Particulate Filter Over Temperature Bank 2 |
| P200E | Catalyst System Over Temperature Bank 1 |
| P200F | Catalyst System Over Temperature Bank 2 |
| P2010 | Intake Manifold Runner Control Circuit High Bank 1 |
| P2011 | Intake Manifold Runner Control Circuit/Open Bank 2 |
| P2012 | Intake Manifold Runner Control Circuit Low Bank 2 |
| P2013 | Intake Manifold Runner Control Circuit High Bank 2 |
| P2014 | Intake Manifold Runner Position Sensor/Switch Circuit Bank 1 |
| P2015 | Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1 |
| P2016 | Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 1 |
| P2017 | Intake Manifold Runner Position Sensor/Switch Circuit High Bank 1 |
| P2018 | Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1 |
| P2019 | Intake Manifold Runner Position Sensor/Switch Circuit Bank 2 |
| P201A | Reductant Injection Valve Circuit Range/Performance Bank 2 Unit 1 |
| P2020 | Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 2 |
| P2021 | Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2 |
| P2022 | Intake Manifold Runner Position Sensor/Switch Circuit High Bank 2 |
| P2023 | Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 2 |
| P2024 | Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit |
| P2025 | Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Performance |
| P2026 | Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit Low Voltage |
| P2027 | Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit High Voltage |
| P2028 | Evaporative Emissions (EVAP) Fuel Vapor Temperature Sensor Circuit Intermittent |
| P2029 | Fuel Fired Heater Disabled |
| P202A | Reductant Tank Heater Control Circuit/Open |
| P202B | Reductant Tank Heater Control Circuit Low |
| P202C | Reductant Tank Heater Control Circuit High |
| P202D | Reductant Leakage |
| P202E | Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1 |
| P202F | Reductant/Regeneration Supply Control Circuit Range/Performance |
| P2030 | Fuel Fired Heater Performance |
| P2031 | Exhaust Gas Temperature Sensor Circuit Bank 1 Sensor 2 |
| P2032 | Exhaust Gas Temperature Sensor Circuit Low Bank 1 Sensor 2 |
| P2033 | Exhaust Gas Temperature Sensor Circuit High Bank 1 Sensor 2 |
| P2034 | Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 2 |
| P2035 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 2 |
| P2036 | Exhaust Gas Temperature Sensor Circuit High Bank 2 Sensor 2 |
| P2037 | Reductant Injection Air Pressure Sensor “A” Circuit |
| P2038 | Reductant Injection Air Pressure Sensor “A” Circuit Range/Performance |
| P2039 | Reductant Injection Air Pressure Sensor “A” Circuit Low |
| P203A | Reductant Level Sensor Circuit |
| P203B | Reductant Level Sensor Circuit Range/Performance |
| P203C | Reductant Level Sensor Circuit Low |
| P203D | Reductant Level Sensor Circuit High |
| P203E | Reductant Level Sensor Circuit Intermittent/Erratic |
| P203F | Reductant Level Too Low |
| P2040 | Reductant Injection Air Pressure Sensor “A” Circuit High |
| P2041 | Reductant Injection Air Pressure Sensor “A” Circuit Intermittent |
| P2042 | Reductant Temperature Sensor Circuit |
| P2043 | Reductant Temperature Sensor Circuit Range/Performance |
| P2044 | Reductant Temperature Sensor Circuit Low |
| P2045 | Reductant Temperature Sensor Circuit High |
| P2046 | Reductant Temperature Sensor Circuit Intermittent |
| P2047 | Reductant Injection Valve Circuit/Open Bank 1 Unit 1 |
| P2048 | Reductant Injection Valve Circuit Low Bank 1 Unit 1 |
| P2049 | Reductant Injection Valve Circuit High Bank 1 Unit 1 |
| P204A | Reductant Pressure Sensor Circuit |
| P204B | Reductant Pressure Sensor Circuit Range/Performance |
| P204C | Reductant Pressure Sensor Circuit Low |
| P204D | Reductant Pressure Sensor Circuit High |
| P204E | Reductant Pressure Sensor Circuit Intermittent/Erratic |
| P204F | Reductant System Performance Bank 1 |
| P2050 | Reductant Injection Valve Circuit/Open Bank 2 Unit 1 |
| P2051 | Reductant Injection Valve Circuit Low Bank 2 Unit 1 |
| P2052 | Reductant Injection Valve Circuit High Bank 2 Unit 1 |
| P2053 | Reductant Injection Valve Circuit/Open Bank 1 Unit 2 |
| P2054 | Reductant Injection Valve Circuit Low Bank 1 Unit 2 |
| P2055 | Reductant Injection Valve Circuit High Bank 1 Unit 2 |
| P2056 | Reductant Injection Valve Circuit/Open Bank 2 Unit 2 |
| P2057 | Reductant Injection Valve Circuit Low Bank 2 Unit 2 |
| P2058 | Reductant Injection Valve Circuit High Bank 2 Unit 2 |
| P2059 | Reductant Injection Air Pump Control Circuit/Open |
| P205A | Reductant Tank Temperature Sensor Circuit |
| P205B | Reductant Tank Temperature Sensor Circuit Range/Performance |
| P205C | Reductant Tank Temperature Sensor Circuit Low |
| P205D | Reductant Tank Temperature Sensor Circuit High |
| P205E | Reductant Tank Temperature Sensor Circuit Intermittent/Erratic |
| P205F | Reductant System Performance Bank 2 |
| P2060 | Reductant Injection Air Pump Control Circuit Low |
| P2061 | Reductant Injection Air Pump Control Circuit High |
| P2062 | Reductant/Regeneration Supply Control Circuit/Open |
| P2063 | Reductant/Regeneration Supply Control Circuit Low |
| P2064 | Reductant/Regeneration Supply Control Circuit High |
| P2065 | Fuel Level Sensor “B” Circuit |
| P2066 | Fuel Level Sensor “B” Circuit Performance |
| P2067 | Fuel Level Sensor “B” Circuit Low |
| P2068 | Fuel Level Sensor “B” Circuit High |
| P2069 | Fuel Level Sensor “B” Circuit Intermittent |
| P206A | Reductant Quality Sensor Circuit |
| P206B | Reductant Quality Sensor Circuit Range/Performance |
| P206C | Reductant Quality Sensor Circuit Low |
| P206D | Reductant Quality Sensor Circuit High |
| P206E | Intake Manifold Tuning (IMT) Valve Stuck Open Bank 2 |
| P206F | Intake Manifold Tuning (IMT) Valve Stuck Closed Bank 2 |
| P2070 | Intake Manifold Tuning (IMT) Valve Stuck Open Bank 1 |
| P2071 | Intake Manifold Tuning (IMT) Valve Stuck Closed Bank 1 |
| P2072 | Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit |
| P2073 | Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit Range/Performance |
| P2074 | Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit Low |
| P2075 | Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit High |
| P2076 | Exhaust Gas Recirculation (EGR) Temperature Sensor Circuit Intermittent |
| P2077 | Exhaust Gas Recirculation (EGR) Flow Sensor Circuit |
| P2078 | Exhaust Gas Recirculation (EGR) Flow Sensor Circuit Range/Performance |
| P2079 | Exhaust Gas Recirculation (EGR) Flow Sensor Circuit Low |
| P207A | Exhaust Gas Recirculation (EGR) Flow Sensor Circuit High |
| P207B | Exhaust Gas Recirculation (EGR) Flow Sensor Circuit Intermittent |
| P207C | Exhaust Gas Recirculation (EGR) Control Circuit Low |
| P207D | Exhaust Gas Recirculation (EGR) Control Circuit High |
| P207E | Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance |
| P207F | Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Bank 1 |
| P2080 | Exhaust Gas Recirculation (EGR) Control Circuit Range/Performance Bank 2 |
| P2081 | EGR Sensor “B” Circuit |
| P2082 | EGR Sensor “B” Circuit Low |
| P2083 | EGR Sensor “B” Circuit High |
| P2084 | EGR Sensor “B” Circuit Range/Performance |
| P2085 | EGR Sensor “B” Circuit Intermittent |
| P2086 | Exhaust Gas Temperature Sensor “B” Circuit |
| P2087 | Exhaust Gas Temperature Sensor “B” Circuit Range/Performance |
| P2088 | Exhaust Gas Temperature Sensor “B” Circuit Low |
| P2089 | Exhaust Gas Temperature Sensor “B” Circuit High |
| P208A | Exhaust Gas Temperature Sensor “B” Circuit Intermittent |
| P208B | Exhaust Gas Temperature Sensor “B” Circuit Performance |
| P208C | Fuel Injector “B” Circuit |
| P208D | Fuel Injector “B” Circuit Low |
| P208E | Fuel Injector “B” Circuit High |
| P208F | Fuel Injector “B” Circuit Range/Performance |
| P2090 | Fuel Injector “B” Circuit Intermittent |
| P2091 | Oxygen Sensor “B” Circuit |
| P2092 | Oxygen Sensor “B” Circuit Low |
| P2093 | Oxygen Sensor “B” Circuit High |
| P2094 | Oxygen Sensor “B” Circuit Range/Performance |
| P2095 | Oxygen Sensor “B” Circuit Intermittent |
| P2096 | Exhaust Gas Temperature Sensor Circuit Bank 1 |
| P2097 | Exhaust Gas Temperature Sensor Circuit Low Bank 1 |
| P2098 | Exhaust Gas Temperature Sensor Circuit High Bank 1 |
| P2099 | Exhaust Gas Temperature Sensor Circuit Bank 2 |
| P20A0 | Exhaust Gas Temperature Sensor Circuit Low Bank 2 |
| P20A1 | Exhaust Gas Temperature Sensor Circuit High Bank 2 |
| P20A2 | Exhaust Gas Temperature Sensor Circuit Intermittent Bank 2 |
| P20A3 | Exhaust Gas Temperature Sensor Circuit Bank 2 |
| P20A4 | Exhaust Gas Temperature Sensor Circuit Bank 2 |
| P20A5 | Exhaust Gas Temperature Sensor Circuit Bank 2 |