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), a variable resistor, informs the ECM of throttle opening. The TPS, connected to a 5-volt reference signal, 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 the ECM has seen the following: voltage is not .25-1.35 volts at ECM terminal A2 for at least 30 seconds at 550-650 RPM.
Test Number 1) This confirms Code 23 and fault are present.
Test Number 2) This test determines if sensor signal line is shorted to ground.
Test Number 3) See THROTTLE POSITION SENSOR in N - REMOVE/INSTALL/OHAUL.
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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.
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