P0223 — Throttle/Pedal Position Sensor B Circuit High
Moderate severityWhat it means
P0223 is stored when the engine control unit sees a fault involving throttle/pedal position sensor B. Sensor B is the second, redundant throttle/pedal position signal that the control unit cross-checks against sensor A for safety. A “high” reading means the signal is pinned near the top of its range — often an open circuit, a lost ground, or a short to voltage.
Common symptoms
- The live reading sits abnormally high or maxed out
- Reduced power or limp mode
- Hesitation or poor throttle response
- Unstable idle
Likely causes
- Open signal or ground wire
- Signal wire shorted to a voltage supply
- Worn position sensor or throttle body
- Connector or wiring fault on the B circuit
What to check first
- Check for an open circuit or missing ground at the sensor connector
- Compare sensor A and B percentages in live data — they should track together
- Inspect the connector and wiring
Can you keep driving?
Because B is a safety-redundant signal, the car often drops to reduced power; have it checked promptly.
Scan, log and diagnose with MechanicAI
Plug a Bluetooth OBD2 adapter into your car and let MechanicAI turn raw data into answers:
- Scan, read and clear fault codes in seconds
- Inspect every sensor with live data
- Create instant logs and automatic trip records
- And above all — analyze it all with AI for the most likely cause and clear next steps.
Related codes
All information, explanations and guidance on this page are general preliminary information only. They are estimates and may be entirely wrong, incomplete or inaccurate, or may not apply to your vehicle at all. Never take any action based on this content alone — do not decide to keep driving, clear codes, replace parts, repair or otherwise work on your vehicle based only on what you read here. In every case, and for any final decision, you must consult qualified technical personnel (a professional mechanic, an authorized service centre or an engineer) and obtain their approval before acting. MechanicAI accepts no liability or responsibility whatsoever for any damage, fault, injury, loss or outcome that may arise — directly or indirectly — from using or relying on this information, for any reason and under any circumstances. By using this page you acknowledge and accept these terms.