Throttle Position Sensor 2 Voltage Below Normal
The throttle position sensor 2 is providing a lower than expected 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)
Inside the throttle body, there's a sensor that tells the engine how far the throttle plate is open. If it sends a voltage lower than about 0.2V at idle, the system thinks something's wrong.
What the computer is actually seeing
The engine control module (ECM) expects the throttle position sensor (TPS) 2 voltage to be between 0.5V and 4.5V when the key is on. If it's below 0.2V or doesn't change appropriately with throttle movement, it triggers this code.
What a healthy reading looks like
Expected TPS 2 voltage should range from 0.5V (closed) to 4.5V (full open).
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.
- 1Check the wiring and connector for the TPS 2 for damage or loose connections. If okay, move to the next step.
- 2Using a multimeter, check voltage at the TPS 2 signal wire with the key on and the engine off. Expected voltage is around 0.5V with the throttle closed. If it's below 0.2V, replace the sensor.
- 3Inspect the throttle body for any debris or mechanical binding. Clean or repair as necessary.
- 4If the sensor and mechanical aspects are good, check the engine ECM for proper operation and updates.
Common causes
- Faulty throttle position sensor 2
- Damaged wiring or connectors to the TPS
- ECM software issue
- Mechanical throttle binding or sticking
- Low battery voltage
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but you'll have reduced performance and potential stalling.
Will this problem come back after clearing the check engine light?
If the underlying issue isn't fixed, it will likely return.
Why does this code show up with other throttle position codes?
They often point to similar issues with the throttle system.
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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