Throttle Position Sensor 2 Circuit Low Voltage
The throttle position sensor 2 is reporting a low voltage issue to the ECU.
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What it means (plain English)
Inside the throttle position sensor, there's a potentiometer that measures the position of the throttle plate. When the engine control unit (ECU) sees readings below 0.1 volts when it expects more (like around 0.5V at idle), it throws this code.
What the computer is actually seeing
The ECU sees a voltage below the expected range from throttle position sensor 2, indicating it may not be functioning correctly.
What a healthy reading looks like
At idle, the voltage from the TPS2 should be between 0.5V to 1.0V, increasing with throttle opening towards 4.5V when 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.
- 11. Check the wiring and connectors to throttle position sensor 2 for any damage or corrosion.
- 22. Verify the sensor's power supply. Check for 5V reference voltage at the sensor's connector.
- 33. Connect a multimeter to the sensor output to measure voltage while someone operates the throttle. Voltage should progress smoothly from 0.5V to around 4.5V as throttle is opened.
- 44. If the voltage is low (below 0.5V), replace the throttle position sensor 2. If it's normal, check ground connections and continuity of the wiring back to the ECU.
- 55. Clear the code and retest. If it returns, look into ECU calibration or update.
Common causes
- Damaged wiring or connectors to the throttle position sensor 2
- Faulty throttle position sensor 2
- Poor ground connection for the sensor
- Calibration issue with the ECU
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you should address it soon, but it may not cause immediate drivability issues.
Will this code come back after clearing?
If the underlying issue isn't fixed (like wiring or bad sensor), yes, it will likely return.
Why does this sensor relate to acceleration issues?
The throttle position sensor tells the ECU how much throttle is being applied; low readings can lead to poor performance.
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