Engine Throttle Position Sensor - High Voltage
Throttle position sensor signal is higher than expected.
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What it means (plain English)
The throttle position sensor (TPS) measures how far the gas pedal is pressed. If it sends a voltage over 4.5 volts, the computer thinks there's a problem and sets this code.
What the computer is actually seeing
The engine control module (ECM) sees a TPS voltage greater than 4.5 volts when it should be between 0.5 and 4.5 volts in operation, which indicates full throttle.
What a healthy reading looks like
TPS output should range from 0.5V (idle) to 4.5V (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 TPS wiring and connector for damage or corrosion. Are there any visible issues? If yes, repair and retest.
- 22. Measure TPS voltage with a multimeter at idle. Is it between 0.5V and 1.0V? If no, replace the TPS and retest.
- 33. With the engine at full throttle, measure the TPS voltage. Is it between 4.0V and 4.5V? If no, repair any wiring issues and retest.
- 44. Check for short circuits from the TPS signal wire to the power or ground. Is there a short? If yes, repair the wiring and retest.
- 55. If all checks are good but code persists, consider replacing the ECM.
Common causes
- Faulty throttle position sensor
- Short circuit in TPS wiring
- Poor connection in the TPS connector
- Fault in the engine control module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix it soon; drivability may be affected, and it could cause further engine issues.
Will this code come back after being cleared?
If the underlying issue is not fixed, yes, it will return.
Why does this code pair with others?
Multiple throttle issues can cause erratic behavior, often leading to related fault codes.
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