Throttle Position Sensor Voltage Too Low
The throttle position sensor voltage is lower than expected.
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 computer checks the throttle position sensor to see how open the throttle plate is. If the sensor sends a voltage below about 0.3 volts when it's supposed to be at least 0.5 volts, the computer recognizes a problem.
What the computer is actually seeing
The computer expects the throttle position sensor to output a voltage between 0.5 to 4.5 volts. If it reads below 0.5 volts under normal conditions, it triggers this code.
What a healthy reading looks like
Throttle position voltage should range from 0.5V (closed) to about 4.5V (fully 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.
- 1Inspect the throttle position sensor wiring and connectors for damage or corrosion. If damaged, repair or replace as needed. Decision point: Ok wiring/connector?
- 2Using a multimeter, check the voltage output from the throttle position sensor while the ignition is on (engine off). Voltage should be between 0.5V and 4.5V. Decision point: Is voltage in range?
- 3If voltage is low, inspect the throttle plate for carbon buildup or mechanical binding. Clean or replace the throttle body if necessary. Decision point: Throttle body clean/frees up?
- 4If the sensor voltage is still low, replace the throttle position sensor. Decision point: Did replacing the sensor fix the code?
Common causes
- Faulty throttle position sensor
- Wiring issues or broken connectors
- Faulty engine control module (ECM)
- Carbon buildup on throttle plate
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Generally, yes, but performance may be affected, so fix it soon.
Will this code come back after resetting it?
If the underlying issue isn't fixed, yes, expect it to return.
Why does this code sometimes pair with SPN 3512?
SPN 3512 is related to high throttle position. Both codes indicate issues with the throttle position sensor.
Working a real vehicle right now?
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