P0221 - Throttle/Pedal Position Sensor/Switch 'B' Circuit Range/Performance

System Information

Throttle position systems can use either sensors or switches with some systems using both. The sensors / switches can be part of the Accelerator pedal, operated via a throttle cable or they can be part of the throttle housing. If the system is fitted with switches, these will normally provide information on 'Fully Open' and 'Fully Closed' positions. If the system is fitted with a sensor this will normally provide information on all throttle positions including the rate of change.

This fault code will relate to either a Throttle Position Switch, a Throttle Position Sensor or an Accelerator Pedal Position Sensor. The value being received by the ECM is within normal parameters but the ECM has calculated that the value is incorrect due to it being incompatible with values from other input sensors.

Recommended Tests

It is recommended to check the following systems and components.

There can be a number of switches or sensors fitted depending on the vehicle, refer to manufacturers data for further system information.