Throttle/Pedal Position Sensor B Circuit High Input
Code P0223 indicates that the Engine Control Module (ECM) has detected a voltage signal from the throttle/pedal position sensor B that is higher than the expected range. This sensor is typically part of the accelerator pedal position (APP) sensor assembly or the throttle position sensor (TPS) on the throttle body. The high input suggests a short to voltage, a faulty sensor, or a wiring issue. This can cause the ECM to misinterpret driver input, leading to poor throttle response, reduced power, or limp mode.
01. Most Common Causes
- Faulty throttle/pedal position sensor B
- Short to voltage in sensor circuit (wiring or connector)
- Damaged wiring or poor connection at sensor or ECM
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor throttle response or hesitation
- Engine may idle rough or stall
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0223 and check for other related codes.
Step 2: Visually inspect the wiring and connectors for the throttle/pedal position sensor for damage, corrosion, or loose connections.
Step 3: Measure voltage at sensor signal wire with ignition on; compare to manufacturer specs (typically 0.5-4.5V). High voltage indicates a short to power.
Step 4: Test sensor resistance and voltage output while moving pedal/throttle; replace if out of range.
Step 5: If sensor and wiring are good, check for ECM issues (rare); consult service manual for pinout tests.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement if DIY; labor at a shop can add $100-$200. Wiring repairs may cost less.