Block of codes
P21xx codes: throttle, accelerator pedal and EGR
This block brings together the codes from P2100 to P219F in the glossary. Open yours to see what it means, its causes and whether you can keep driving.
Reviewed by Daniel Morales, founder of Reprorace SL, on
What this block covers
Fuel and air metering
The engine measures the incoming air and meters the fuel so the mixture is right; the throttle, the accelerator pedal and the turbo are here too. A fault usually shows as higher fuel use, jerking, lack of power or hard starting.
Speed, idle and auxiliary inputs
The vehicle speed sensors and idle control, the speed the engine turns at when you are not accelerating.
Emission control
The catalytic converter, oxygen sensors, EGR, fuel vapor system (EVAP), particulate filter and NOx reduction clean the exhaust. A fault here raises pollution and may make the car fail its inspection; left alone, some end in a bigger fault or in limp-home mode.
Engine (mechanical, cooling and lubrication)
The engine's mechanics, timing (camshaft and crankshaft), cooling and lubrication. Many of these codes check that the engine is in time and at the right temperature.
The 78 codes of the block
- P2100Throttle actuator A control motor, circuit open
- P2101Throttle actuator A control motor, circuit: range/performance
- P2102Throttle actuator A control motor, circuit: signal low
- P2103Throttle actuator A control motor, circuit: signal high
- P2105Throttle actuator control system: forced engine shutdown
- P2106Throttle actuator control system: forced power limitation
- P2107Throttle actuator A control module: processor fault
- P2108Throttle actuator A control module: performance
- P2109Throttle/pedal position sensor A: lower stop fault
- P210AThrottle actuator B control motor, circuit open
- P210CThrottle actuator B control motor, circuit: signal low
- P210DThrottle actuator B control motor, circuit: signal high
- P2110Throttle actuator A control system: forced engine speed limitation
- P2111Throttle actuator A control system: stuck open
- P2112Throttle actuator A control system: stuck closed
- P2118Throttle actuator A control motor current: range/performance
- P2119Throttle actuator A control throttle body: range/performance
- P2122Throttle/pedal position sensor/switch D, circuit: signal low
- P2127Throttle/pedal position sensor/switch E, circuit: signal low
- P2135Throttle/pedal position sensor/switch A/B voltage: correlation fault
- P2136Throttle/pedal position sensor/switch A/C voltage: correlation fault
- P2137Throttle/pedal position sensor/switch B/C voltage: correlation fault
- P2138Throttle/pedal position sensor/switch D/E voltage: correlation fault
- P213AEGR throttle, control circuit B open
- P213BEGR throttle, control circuit B: range/performance
- P2141EGR throttle, control circuit A: signal low
- P2142EGR throttle, control circuit A: signal high
- P2143EGR vent, control circuit open
- P2144EGR vent, control circuit: signal low
- P2145EGR vent, control circuit: signal high
- P2146Fuel injector group A, supply voltage circuit open
- P2147Fuel injector group A, supply voltage circuit: signal low
- P2148Fuel injector group A, supply voltage circuit: signal high
- P2149Fuel injector group B, supply voltage circuit open
- P2150Fuel injector group B, supply voltage circuit: signal low
- P2151Fuel injector group B, supply voltage circuit: signal high
- P2158Vehicle speed sensor B, circuit: malfunction
- P2159Vehicle speed sensor B, circuit: range/performance
- P2160Vehicle speed sensor B, circuit: signal low
- P2161Vehicle speed sensor B, circuit: intermittent, erratic or high
- P2162Vehicle speed sensor A/B: correlation fault
- P2163Throttle/pedal position sensor A: upper stop fault
- P2164Throttle/pedal position sensor B: upper stop fault
- P2169Exhaust pressure regulator vent solenoid, control circuit open
- P2170Exhaust pressure regulator vent solenoid, control circuit: signal low
- P2171Exhaust pressure regulator vent solenoid, control circuit: signal high
- P2172Throttle actuator control system: sudden high air flow detected
- P2174Throttle actuator control system: sudden low air flow detected
- P2175Throttle actuator control system: low air flow detected
- P2177System (bank 1): too lean off idle
- P2178System (bank 1): too rich off idle
- P2179System (bank 2): too lean off idle
- P2180System (bank 2): too rich off idle
- P2181Cooling system: performance
- P2182Engine coolant temperature sensor 2, circuit: malfunction
- P2183Engine coolant temperature sensor 2, circuit: range/performance
- P2184Engine coolant temperature sensor 2, circuit: signal low
- P2185Engine coolant temperature sensor 2, circuit: signal high
- P2186Engine coolant temperature sensor 2, circuit: intermittent/erratic
- P2187System (bank 1): too lean at idle
- P2188System (bank 1): too rich at idle
- P2189System (bank 2): too lean at idle
- P2190System (bank 2): too rich at idle
- P2191System (bank 1): too lean at higher load
- P2192System (bank 1): too rich at higher load
- P2193System (bank 2): too lean at higher load
- P2194System (bank 2): too rich at higher load
- P2195O2 sensor signal (bank 1, sensor 1): biased or stuck lean
- P2196O2 sensor signal (bank 1, sensor 1): biased or stuck rich
- P2197O2 sensor signal (bank 2, sensor 1): biased or stuck lean
- P2198O2 sensor signal (bank 2, sensor 1): biased or stuck rich
- P2199Intake air temperature sensor 1/2: correlation fault
- P219ABank 1 air-fuel ratio: imbalance
- P219BBank 2 air-fuel ratio: imbalance
- P219CCylinder 1 air-fuel ratio: imbalance
- P219DCylinder 2 air-fuel ratio: imbalance
- P219ECylinder 3 air-fuel ratio: imbalance
- P219FCylinder 4 air-fuel ratio: imbalance
Other blocks
Read your car's fault codes on your phone
With an ECO-LITE in the OBD socket you see the codes in your account, with the data captured when the fault happened, and your workshop can check them remotely, always with your permission.
Keep reading
- OBD fault codes: what each one means
- Check engine light on: what to do
- How to read and clear your car's fault codes
- Will your car pass its MOT or inspection with the engine light on?
- Wi-Fi OBD2 reader: which one to choose
- Reading fault codes by car make
- Remote OBD diagnostics: what it is, how it works and what it can't do
- Vehicle diagnostics glossary