Throttle Position Sensor 1 Circuit
Throttle Position Sensor 1 has a fault condition.
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What it means (plain English)
The Engine Control Module (ECM) isn't getting the correct signal from the throttle position sensor, which tells it how far the accelerator pedal is pressed.
What the computer is actually seeing
The ECM monitors an abnormal voltage or resistance from the throttle position sensor; expected voltage range is typically 0.5V to 4.5V depending on the full throttle position.
What a healthy reading looks like
Voltage from the throttle position sensor should be 0.5-1.0V at closed throttle and 4.0-4.5V at full throttle.
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 for the throttle position sensor. Look for corrosion, frayed wires, or loose connections.
- 22. Using a multimeter, check the voltage at the throttle position sensor harness while the ignition is on. Expected values are 0.5-1.0V at closed throttle and 4.0-4.5V at full throttle.
- 33. If voltage readings are outside expected values, replace the throttle position sensor and retest.
- 44. If the sensor is good, check the throttle linkage for binding or misalignment that could cause incorrect readings.
- 55. Clear the fault codes and perform a road test to see if the code returns.
Common causes
- Faulty throttle position sensor
- Wiring issues or damaged connectors
- Incorrectly adjusted throttle linkage
- Electrical interference from other circuits
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it’s drivable but fix soon to avoid issues with throttle response.
Will this code come back after repair?
If the root cause is fixed and wiring is correct, it should not return.
Why does this code sometimes pair with SPN 110?
SPN 110 indicates a potentiometer fault, which often coincides with throttle position sensor issues.
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