Throttle Position Sensor A - Voltage Above Normal
The throttle position sensor voltage is too high.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The throttle position sensor measures how far the gas pedal is pressed. When it sends a signal that's too high (over 4.5 volts), the computer thinks there's a problem, like the throttle is stuck or the sensor is bad.
What the computer is actually seeing
The Engine Control Module (ECM) sees the throttle position sensor voltage readings that range from 0.5 to 4.5 volts. If the voltage exceeds 4.5 volts, it triggers this fault code.
What a healthy reading looks like
Throttle position sensor voltage should be between 0.5 and 4.5 volts at idle and full throttle.
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 the throttle position sensor connector for dirt and damage. Clean or repair as necessary. Decision: Is the connector okay? If no, fix it and retest. If yes, move to step 2.
- 22. Check the wiring from the throttle position sensor to the ECM for shorts or breaks. Use a multimeter to measure resistance. Decision: Are the wires intact? If no, repair the wiring and retest. If yes, go to step 3.
- 33. Measure the throttle position sensor voltage while slowly pressing the accelerator. It should rise smoothly from 0.5 to 4.5 volts. Decision: Does the sensor show an out-of-range voltage? If yes, replace the throttle position sensor. If no, go to step 4.
- 44. Scan for any other fault codes related to the throttle system. Decision: Are other codes present? If yes, troubleshoot those codes first. If no, consider reprogramming the ECM.
Common causes
- Damaged throttle position sensor
- Wiring or connector issues
- Faulty ECM
- Calibration issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive with a high throttle position sensor code, as it may lead to unexpected acceleration issues.
Can this code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code will reappear.
Why does this code appear with a low fuel pressure code?
Sometimes, low fuel pressure can affect throttle response, causing the throttle position sensor to send incorrect voltage.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →