Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Code 23 - Throttle Position Sensor MISADJUSTED: Notes
The Throttle Position Sensor (TPS) is a variable resistor that informs the ECM the degree of throttle opening. The sensor is connected to a 5-volt reference signal and has a high resistance value at closed throttle. At wide open throttle, TPS resistance is at its lowest and output to the ECM will be close to 5 volts.
Code 23 means that the ECM has seen the following: voltage not between .25-1.35 volts at ECM terminal "A2" for at least 30 seconds, with engine speed between 550-650 RPM.
- This test confirms Code 23 and that fault is present.
- This test will determine if sensor signal line is shorted to ground.
- See THROTTLE POSITION SENSOR installation and adjustment under REMOVAL & INSTALLATION in this article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.