Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation

The throttle position sensor has two circuits, and they are giving different voltage readings, which the computer doesn't like. It expects both sensors to show similar values when the pedal is pressed.

The engine control module (ECM) sees a difference in voltage from the throttle position sensors, typically around 0.5V to 4.5V for each sensor under normal operation. If one sensor shows a lower voltage than the other when they should be close, the code triggers.

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Check the wiring and connectors for the throttle position sensor. Look for damage, corrosion, or loose connections. Ensure all connections are secure. Decision: If wiring is damaged, repair or replace it.
2. 22. Measure the voltage at the throttle position sensor connector with the key on, engine off (KOEO). Compare sensor A and sensor B values. Decision: If values are within 10% of each other, check for other codes; if not, sensor may be faulty.
3. 33. With the engine running, monitor throttle position readings using a scan tool. Ensure they match expected values during acceleration. Decision: If readings do not match, replace the defective throttle position sensor.
4. 44. Inspect the throttle body for any mechanical binding or obstructions. Clean it if necessary. Decision: If throttle body is clean and issue persists, consider throttle position sensor replacement.

• Faulty throttle position sensor
• Wiring issues between the throttle sensor and the ECM
• Poor connections or corrosion on sensor connectors
• Mechanical issues like a binding throttle body

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