Throttle/Pedal Position Sensor/Switch B Circuit Low Input
Throttle position sensor signal is too low.
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 B is not sending enough voltage to the engine control module (ECM).
What the computer is actually seeing
The ECM expects a voltage between 0.5 to 4.5 volts from the sensor when the accelerator pedal is pressed. If it sees less than 0.5 volts, it throws this code.
What a healthy reading looks like
0.5 to 4.5 volts from the throttle position sensor under 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. Inspect the wiring and connectors to the throttle position sensor B for damage or corrosion. Tighten any loose connections. - Decision: If damaged, repair or replace wiring; if good, proceed to 2.
- 22. Check the voltage at the throttle position sensor B harness connector with the ignition on and engine off. Expected range is 0.5 to 4.5 volts. - Decision: If out of range, replace the sensor; if within range, proceed to 3.
- 33. With the engine running, check the voltage while slowly pressing the accelerator pedal. It should smoothly increase from 0.5 to 4.5 volts. - Decision: If it does not, replace the throttle position sensor B; if it does, check the ECM.
Common causes
- Wiring issues (shorts or opens) in the throttle position sensor circuit
- Faulty throttle position sensor B
- Bad ECM ground or power supply
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to repair it soon; drivability may be impacted.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will likely return.
Why does this code sometimes pair with other throttle position codes?
They can all stem from common issues like wiring faults or sensor malfunctions.
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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