Throttle Position Sensor Circuit Low Voltage
Throttle position sensor is sending a low voltage signal.
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 (TPS) isn't sending enough voltage to the engine control unit (ECU), which is needed to determine how much air is entering the engine. This can lead to improper engine performance because the ECU doesn't know how to adjust fuel delivery correctly.
What the computer is actually seeing
The PCM expects the throttle position to vary between 0.5V (closed) to 4.5V (fully open). A reading below the expected range indicates a low voltage condition, signaling a possible issue with the TPS or its wiring.
What a healthy reading looks like
Throttling voltage should be between 0.5V and 4.5V during operation; idle position at ~0.5V, full throttle at ~4.5V.
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 connector for the throttle position sensor for any visible damage, corrosion, or loose connections. Decision point: Are the wiring and connector intact? Yes: Go to step 2. No: Repair wiring/connectors and retest.
Common causes
- Faulty throttle position sensor
- Poor wiring or connector issues causing impedance
- Unclean or damaged throttle body affecting sensor readings
- Faulty PCM interpreting values incorrectly
Typical repair cost
$200-$500
Related codes
Frequently asked questions
Is it safe to drive the vehicle with this code?
Moderate severity means fix it soon, but driving might still be possible unless performance is severely affected.
Will the code come back after clearing it?
If the underlying issue isn't fixed, the code is likely to return.
Why does this code sometimes show with other SPNs?
It can pair with other codes related to throttle, fuel management, or engine performance due to interrelated sensor functions.
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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