Throttle Position Sensor (TPS) Circuit Low Input
Throttle position sensor circuit is reporting a low voltage signal.
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What it means (plain English)
The throttle position sensor tells the engine control module (ECM) how far the gas pedal is pressed by sending a voltage signal. If the signal drops too low, it thinks the pedal isn't pressed at all, which can cause poor engine performance.
What the computer is actually seeing
The ECM expects a throttle position voltage between 0.5V (closed) and 4.5V (fully open). If the voltage falls below 0.1V, a fault is detected and the code is set.
What a healthy reading looks like
Expected voltage at the throttle position sensor typically ranges from 0.5V to 4.5V based on throttle position.
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 wiring and connectors of the throttle position sensor for any damage or corrosion.
- 22. Check the throttle position sensor voltage using a multimeter. You should see between 0.5V to 4.5V as you press the gas pedal. If not, replace the TPS.
- 33. If voltage is correct, check for short or open circuits using the wiring diagram. Repair as needed.
- 44. Test the throttle body for smooth operation; if it's sticking, clean or replace it based on wear.
Common causes
- Faulty throttle position sensor
- Wiring issues (short or open circuit)
- Connector corrosion or damage
- Faulty ECM
- Mechanical linkage issues with the throttle body
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
You may experience poor acceleration or stalling, so it's best to fix it as soon as possible.
Will this error come back?
If the issue is not fixed, or if it’s a wiring problem, it may return.
Why does this code sometimes pair with other codes?
Related codes often indicate broader system failures, as they all can affect throttle position reporting.
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