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 22, Throttle Position Sensor (TPS) Circuit (A/T Only): Notes
SIGNAL VOLTAGE LOW
TPS provides a voltage signal that changes relative to throttle opening. Signal voltage varies from .5 volt at idle to approximately 5 volts at wide open throttle. TPS signal is an important input used by the ECM for fuel control and most ECM controlled outputs.
- Code 22 will set if engine is running and TPS signal voltage is less than .1 volt for .7 second.
- This simulates a Code 21 (high voltage). If the ECM sees the high signal voltage, the ECM and wiring are okay.
- This checks for reference voltage from the ECM.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.