Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
Throttle position sensor voltages are not matching as expected.
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What it means (plain English)
This code means that the computer sees conflicting signals from the throttle position sensors. It expects them to read similar values but one is different, which can confuse the engine control.
What the computer is actually seeing
The Engine Control Module (ECM) monitors two throttle position sensors (TPS) that should report similar voltages. If TPS A reports 0.5V and TPS B reports 4.5V, the voltage difference triggers this code.
What a healthy reading looks like
Both TPS should generally report between 0.5V (closed) and 4.5V (fully open) when the pedal is pressed. They should match closely, typically within 0.1V of each other in normal operation.
Guided diagnostic — the DiagCoach way
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.
- 11. Inspect wiring and connectors for the throttle position sensors for damage or corrosion. Ensure they are secure and free of shorts.
- 22. Use a multimeter to check the voltage output of TPS A and TPS B while someone moves the throttle pedal. Do they match within 0.1V?
- 33. If voltages don't match, swap out the lower-voltage TPS. Recheck values. Did they normalize?
- 44. If swapping the sensor didn't help, inspect the wiring harness for shorts or opens. Continuity tests may be necessary.
- 55. If wiring is good and the issue persists, consider checking the throttle body for mechanical issues.
- 66. If all checks pass and problem remains, it may be a fault in the ECM. Consider reprogramming or replacing it.
Common causes
- Faulty throttle position sensor
- Bad wiring or connectors between sensor and ECM
- Throttle body issues
- ECM programming error or failure
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's still drivable, but performance may be affected. Monitor power, as it may go into limp mode.
Will this issue come back after fixing?
If the root cause is identified and repaired, it should not come back.
Why does this code pair with other throttle-related codes?
These codes involve similar systems and sensors, so a failure in one often affects others.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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