This section covers OBD-II codes P2100 to P2199, which are primarily related to Fuel and air metering and auxiliary emission control.
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| Code | Description |
| P2100 | Throttle Actuator “A” Control Motor Circuit/Open |
| P2101 | Throttle Actuator “A” Control Motor Circuit Range/Performance |
| P2102 | Throttle Actuator “A” Control Motor Circuit Low |
| P2103 | Throttle Actuator “A” Control Motor Circuit High |
| P2104 | Throttle Actuator Control System – Forced Idle |
| P2105 | Throttle Actuator Control System – Forced Engine Shutdown |
| P2106 | Throttle Actuator Control System – Forced Limited Power |
| P2107 | Throttle Actuator Control Module Processor |
| P2108 | Throttle Actuator Control Module Performance |
| P2109 | Throttle/Pedal Position Sensor “A” Minimum Stop Performance |
| P210A | Throttle Actuator “B” Control Motor Circuit/Open |
| P210B | Throttle Actuator “B” Control Motor Circuit Range/Performance |
| P210C | Throttle Actuator “B” Control Motor Circuit Low |
| P210D | Throttle Actuator “B” Control Motor Circuit High |
| P210E | Throttle/Pedal Position Sensor/Switch “C”/”F” Voltage Correlation |
| P210F | ISO/SAE Reserved |
| P2110 | Throttle Actuator Control System – Forced Limited RPM |
| P2111 | Throttle Actuator Control System – Stuck Open |
| P2112 | Throttle Actuator Control System – Stuck Closed |
| P2113 | Throttle/Pedal Position Sensor “B” Minimum Stop Performance |
| P2114 | Throttle/Pedal Position Sensor “C” Minimum Stop Performance |
| P2115 | Throttle/Pedal Position Sensor “D” Minimum Stop Performance |
| P2116 | Throttle/Pedal Position Sensor “E” Minimum Stop Performance |
| P2117 | Throttle/Pedal Position Sensor “F” Minimum Stop Performance |
| P2118 | Throttle Actuator Control Motor Current Range/Performance |
| P2119 | Throttle Actuator Control Throttle Body Range/Performance |
| P211A | ISO/SAE Reserved |
| P211B | ISO/SAE Reserved |
| P211C | ISO/SAE Reserved |
| P211D | ISO/SAE Reserved |
| P211E | ISO/SAE Reserved |
| P211F | ISO/SAE Reserved |
| P2120 | Throttle/Pedal Position Sensor/Switch “D” Circuit |
| P2121 | Throttle/Pedal Position Sensor/Switch “D” Circuit Range/Performance |
| P2122 | Throttle/Pedal Position Sensor/Switch “D” Circuit Low |
| P2123 | Throttle/Pedal Position Sensor/Switch “D” Circuit High |
| P2124 | Throttle/Pedal Position Sensor/Switch “D” Circuit Intermittent |
| P2125 | Throttle/Pedal Position Sensor/Switch “E” Circuit |
| P2126 | Throttle/Pedal Position Sensor/Switch “E” Circuit Range/Performance |
| P2127 | Throttle/Pedal Position Sensor/Switch “E” Circuit Low |
| P2128 | Throttle/Pedal Position Sensor/Switch “E” Circuit High |
| P2129 | Throttle/Pedal Position Sensor/Switch “E” Circuit Intermittent |
| P212A | Throttle Position Sensor/Switch “G” Circuit |
| P212B | Throttle Position Sensor/Switch “G” Circuit Range/Performance |
| P212C | Throttle Position Sensor/Switch “G” Circuit Low |
| P212D | Throttle Position Sensor/Switch “G” Circuit High |
| P212E | Throttle Position Sensor/Switch “G” Circuit Intermittent |
| P212F | ISO/SAE Reserved |
| P2130 | Throttle/Pedal Position Sensor/Switch “F” Circuit |
| P2131 | Throttle/Pedal Position Sensor/Switch “F” Circuit Range/Performance |
| P2132 | Throttle/Pedal Position Sensor/Switch “F” Circuit Low |
| P2133 | Throttle/Pedal Position Sensor/Switch “F” Circuit High |
| P2134 | Throttle/Pedal Position Sensor/Switch “F” Circuit Intermittent |
| P2135 | Throttle/Pedal Pos Sensor/Switch A / B Voltage Correlation |
| P2136 | Throttle/Pedal Pos Sensor/Switch A / C Voltage Correlation |
| P2137 | Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation |
| P2138 | Throttle/Pedal Pos Sensor/Switch D / E Voltage Correlation |
| P2139 | Throttle/Pedal Pos Sensor/Switch D / F Voltage Correlation |
| P213A | Exhaust Gas Recirculation Throttle Control Circuit “B” /Open |
| P213B | Exhaust Gas Recirculation Throttle Control Circuit “B” Range/Performance |
| P213C | Exhaust Gas Recirculation Throttle Control Circuit “B” Low |
| P213D | Exhaust Gas Recirculation Throttle Control Circuit “B” High |
| P213E | Fuel Injection System Fault – Forced Engine Shutdown |
| P213F | Fuel Pump System Fault – Forced Engine Shutdown |
| P2140 | Throttle/Pedal Pos Sensor/Switch E / F Voltage Correlation |
| P2141 | Exhaust Gas Recirculation Throttle Control Circuit “A” Low |
| P2142 | Exhaust Gas Recirculation Throttle Control Circuit “A” High |
| P2143 | Exhaust Gas Recirculation Vent Control Circuit/Open |
| P2144 | Exhaust Gas Recirculation Vent Control Circuit Low |
| P2145 | Exhaust Gas Recirculation Vent Control Circuit High |
| P2146 | Fuel Injector Group “A” Supply Voltage Circuit/Open |
| P2147 | Fuel Injector Group “A” Supply Voltage Circuit Low |
| P2148 | Fuel Injector Group “A” Supply Voltage Circuit High |
| P2149 | Fuel Injector Group “B” Supply Voltage Circuit/Open |
| P214A | ISO/SAE Reserved |
| P214B | ISO/SAE Reserved |
| P214C | ISO/SAE Reserved |
| P214D | ISO/SAE Reserved |
| P214E | ISO/SAE Reserved |
| P214F | ISO/SAE Reserved |
| P2150 | Fuel Injector Group “B” Supply Voltage Circuit Low |
| P2151 | Fuel Injector Group “B” Supply Voltage Circuit High |
| P2152 | Fuel Injector Group “C” Supply Voltage Circuit/Open |
| P2153 | Fuel Injector Group “C” Supply Voltage Circuit Low |
| P2154 | Fuel Injector Group “C” Supply Voltage Circuit High |
| P2155 | Fuel Injector Group “D” Supply Voltage Circuit/Open |
| P2156 | Fuel Injector Group “D” Supply Voltage Circuit Low |
| P2157 | Fuel Injector Group “D” Supply Voltage Circuit High |
| P2158 | Vehicle Speed Sensor “B” |
| P2159 | Vehicle Speed Sensor “B” Range/Performance |
| P215A | Vehicle Speed – Wheel Speed Correlation |
| P215B | Vehicle Speed – Output Shaft Speed Correlation |
| P215C | Output Shaft Speed – Wheel Speed Correlation |
| P215D | ISO/SAE Reserved |
| P215E | ISO/SAE Reserved |
| P215F | ISO/SAE Reserved |
| P2160 | Vehicle Speed Sensor “B” Circuit Low |
| P2161 | Vehicle Speed Sensor “B” Intermittent/Erratic/High |
| P2162 | Vehicle Speed Sensor “A”/”B” Correlation |
| P2163 | Throttle/Pedal Position Sensor “A” Maximum Stop Performance |
| P2164 | Throttle/Pedal Position Sensor “B” Maximum Stop Performance |
| P2165 | Throttle/Pedal Position Sensor “C” Maximum Stop Performance |
| P2166 | Throttle/Pedal Position Sensor “D” Maximum Stop Performance |
| P2167 | Throttle/Pedal Position Sensor “E” Maximum Stop Performance |
| P2168 | Throttle/Pedal Position Sensor “F” Maximum Stop Performance |
| P2169 | Exhaust Pressure Regulator Vent Solenoid Control Circuit/Open |
| P216A | Fuel Injector Group “E” Supply Voltage Circuit/Open |
| P216B | Fuel Injector Group “E” Supply Voltage Circuit Low |
| P216C | Fuel Injector Group “E” Supply Voltage Circuit High |
| P216D | Fuel Injector Group “F” Supply Voltage Circuit/Open |
| P216E | Fuel Injector Group “F” Supply Voltage Circuit Low |
| P216F | Fuel Injector Group “F” Supply Voltage Circuit High |
| P2170 | Exhaust Pressure Regulator Vent Solenoid Control Circuit Low |
| P2171 | Exhaust Pressure Regulator Vent Solenoid Control Circuit High |
| P2172 | Throttle Actuator Control System – Sudden High Air Flow Detected |
| P2173 | Throttle Actuator Control System – High Air Flow Detected |
| P2174 | Throttle Actuator Control System – Sudden Low Air Flow Detected |
| P2175 | Throttle Actuator Control System – Low Air Flow Detected |
| P2176 | Throttle Actuator Control System – Idle Position Not Learned |
| P2177 | System Too Lean Off Idle Bank 1 |
| P2178 | System Too Rich Off Idle Bank 1 |
| P2179 | System Too Lean Off Idle Bank 2 |
| P217A | Fuel Injector Group “G” Supply Voltage Circuit/Open |
| P217B | Fuel Injector Group “G” Supply Voltage Circuit Low |
| P217C | Fuel Injector Group “G” Supply Voltage Circuit High |
| P217D | Fuel Injector Group “H” Supply Voltage Circuit/Open |
| P217E | Fuel Injector Group “H” Supply Voltage Circuit Low |
| P217F | Fuel Injector Group “H” Supply Voltage Circuit High |
| P2180 | System Too Rich Off Idle Bank 2 |
| P2181 | Cooling System Performance |
| P2182 | Engine Coolant Temperature Sensor 2 Circuit |
| P2183 | Engine Coolant Temperature Sensor 2 Circuit Range/Performance |
| P2184 | Engine Coolant Temperature Sensor 2 Circuit Low |
| P2185 | Engine Coolant Temperature Sensor 2 Circuit High |
| P2186 | Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic |
| P2187 | System Too Lean at Idle Bank 1 |
| P2188 | System Too Rich at Idle Bank 1 |
| P2189 | System Too Lean at Idle Bank 2 |
| P218A | ISO/SAE Reserved |
| P218B | ISO/SAE Reserved |
| P218C | ISO/SAE Reserved |
| P218D | ISO/SAE Reserved |
| P218E | ISO/SAE Reserved |
| P218F | ISO/SAE Reserved |
| P2190 | System Too Rich at Idle Bank 2 |
| P2191 | System Too Lean at Higher Load Bank 1 |
| P2192 | System Too Rich at Higher Load Bank 1 |
| P2193 | System Too Lean at Higher Load Bank 2 |
| P2194 | System Too Rich at Higher Load Bank 2 |
| P2195 | O2 Sensor Signal Stuck Lean Bank 1 Sensor 1 |
| P2196 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 1 |
| P2197 | O2 Sensor Signal Stuck Lean Bank 2 Sensor 1 |
| P2198 | O2 Sensor Signal Stuck Rich Bank 2 Sensor 1 |
| P2199 | Intake Air Temperature Sensor 1/2 Correlation |
| P219A | Bank 1 Air/Fuel Ratio Imbalance |
| P219B | Bank 2 Air/Fuel Ratio Imbalance |
| P219C | Cylinder #1 Imbalance Error |
| P219D | Cylinder #2 Imbalance Error |
| P219E | Cylinder #3 Imbalance Error |
| P219F | Cylinder #4 Imbalance Error |
| P21AA | ISO/SAE Reserved |
| P21AB | ISO/SAE Reserved |
| P21AC | ISO/SAE Reserved |
| P21AD | ISO/SAE Reserved |
| P21AE | ISO/SAE Reserved |
| P21AF | ISO/SAE Reserved |
| P21B0 | ISO/SAE Reserved |
| P21B1 | ISO/SAE Reserved |
| P21B2 | ISO/SAE Reserved |
| P21B3 | ISO/SAE Reserved |
| P21B4 | ISO/SAE Reserved |
| P21B5 | ISO/SAE Reserved |
| P21B6 | ISO/SAE Reserved |
| P21B7 | ISO/SAE Reserved |
| P21B8 | ISO/SAE Reserved |
| P21B9 | ISO/SAE Reserved |
| P21BA | ISO/SAE Reserved |
| P21BB | ISO/SAE Reserved |
| P21BC | ISO/SAE Reserved |
| P21BD | ISO/SAE Reserved |
| P21BE | ISO/SAE Reserved |
| P21BF | ISO/SAE Reserved |
| P21C0 | ISO/SAE Reserved |
| P21C1 | ISO/SAE Reserved |
| P21C2 | ISO/SAE Reserved |
| P21C3 | ISO/SAE Reserved |
| P21C4 | ISO/SAE Reserved |
| P21C5 | ISO/SAE Reserved |
| P21C6 | ISO/SAE Reserved |
| P21C7 | ISO/SAE Reserved |
| P21C8 | ISO/SAE Reserved |
| P21C9 | ISO/SAE Reserved |
| P21CA | ISO/SAE Reserved |
| P21CB | ISO/SAE Reserved |
| P21CC | ISO/SAE Reserved |
| P21CD | ISO/SAE Reserved |
| P21CE | ISO/SAE Reserved |
| P21CF | ISO/SAE Reserved |
| P21D0 | ISO/SAE Reserved |
| P21D1 | ISO/SAE Reserved |
| P21D2 | ISO/SAE Reserved |
| P21D3 | ISO/SAE Reserved |
| P21D4 | ISO/SAE Reserved |
| P21D5 | ISO/SAE Reserved |
| P21D6 | ISO/SAE Reserved |
| P21D7 | ISO/SAE Reserved |
| P21D8 | ISO/SAE Reserved |
| P21D9 | ISO/SAE Reserved |
| P21DA | ISO/SAE Reserved |
| P21DB | ISO/SAE Reserved |
| P21DC | ISO/SAE Reserved |
| P21DD | ISO/SAE Reserved |
| P21DE | ISO/SAE Reserved |
| P21DF | ISO/SAE Reserved |
| P21E0 | ISO/SAE Reserved |
| P21E1 | ISO/SAE Reserved |
| P21E2 | ISO/SAE Reserved |
| P21E3 | ISO/SAE Reserved |
| P21E4 | ISO/SAE Reserved |
| P21E5 | ISO/SAE Reserved |
| P21E6 | ISO/SAE Reserved |
| P21E7 | ISO/SAE Reserved |
| P21E8 | ISO/SAE Reserved |
| P21E9 | ISO/SAE Reserved |
| P21EA | ISO/SAE Reserved |
| P21EB | ISO/SAE Reserved |
| P21EC | ISO/SAE Reserved |
| P21ED | ISO/SAE Reserved |
| P21EE | ISO/SAE Reserved |
| P21EF | ISO/SAE Reserved |
| P21F0 | ISO/SAE Reserved |
| P21F1 | ISO/SAE Reserved |
| P21F2 | ISO/SAE Reserved |
| P21F3 | ISO/SAE Reserved |
| P21F4 | ISO/SAE Reserved |
| P21F5 | ISO/SAE Reserved |
| P21F6 | ISO/SAE Reserved |
| P21F7 | ISO/SAE Reserved |
| P21F8 | ISO/SAE Reserved |
| P21F9 | ISO/SAE Reserved |
| P21FA | ISO/SAE Reserved |
| P21FB | ISO/SAE Reserved |
| P21FC | ISO/SAE Reserved |
| P21FD | ISO/SAE Reserved |
| P21FE | ISO/SAE Reserved |
| P21FF | ISO/SAE Reserved |