P0223: The throttle or pedal position sensor/switch B circuit is high.
Meaning, symptoms, causes and checks
The throttle or pedal position sensor/switch B circuit is high. This identifies a high electrical signal on channel B, rather than proving that the throttle is physically stuck open.
Affected system: Powertrain
Symptoms
- Delayed, limited or absent accelerator response.
- Engine warning light and possible limp mode; idle may become uneven.
Possible causes
- Signal shorted to supply or an open sensor ground.
- Failed sensor or contaminated connector; causes depend on the channel’s circuit.
What to check
- Use the wiring diagram to identify channel B: throttle, pedal or switch; read accompanying faults on the other channels.
- Inspect channel B’s connector, terminals and harness; test reference supply and ground using the OEM pin assignment.
- Measure signal B and ground voltage drop; check shorts to supply or an open return using the wiring diagram.
- Check installation and mechanical travel after identifying the component; perform adaptation only when the repair procedure requires it.
- After repair, clear codes and recheck channel B under the original recorded conditions, following the manufacturer’s procedure.
Also written as: P0223-00, P022300, PO223 (some scan tools add the fault-type byte, e.g. -00).