Throttle Position Sensor Range/Performance Problem
Throttle position sensor is not showing expected range or performance.
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, and it's sending back values that don't match what the engine expects.
What the computer is actually seeing
The engine control unit (ECU) looks for a specific voltage signal from the throttle position sensor, typically ranging between 0.5V (at idle) to about 4.5V (fully pressed).
What a healthy reading looks like
0.5V to 4.5V for proper throttle position sensor operation.
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. Check the wiring and connectors for the throttle position sensor. Look for frays or corrosion. Decision point: Good wiring?
- 22. Use a multimeter to check the voltage at the throttle position sensor. You should see 0.5V at idle and 4.5V at full throttle. Decision point: Are voltages within spec?
- 33. If not, replace the throttle position sensor and recheck voltages. Decision point: Did the issue resolve?
- 44. If voltages are correct, inspect the throttle body for carbon buildup or sticking. Clean if necessary. Decision point: Is throttle movement smooth after cleaning?
Common causes
- Wiring issues between throttle position sensor and ECU
- Faulty throttle position sensor
- Poor connector contacts
- Dirty throttle body or sensor
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with code B246B?
It’s generally drivable but may result in reduced power and responsiveness; fix it soon.
Will this code come back after being cleared?
If the underlying issue isn’t fixed, the code will likely return.
Why did this code come up with other throttle codes?
Throttle codes often appear together due to shared components like the throttle position sensor.
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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