Throttle Position Sensor/Switch A Circuit Range/Performance Problem
The throttle position sensor is giving a confusing signal to the engine control module (ECM).
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The throttle position sensor (TPS) measures how far you press the gas pedal. If it sends a signal that's too high or low for normal operation, the computer struggles to control the engine effectively.
What the computer is actually seeing
The ECM expects the TPS to output a voltage between 0.5V and 4.5V corresponding to the pedal position. If the voltage stays below 0.1V or goes beyond 4.7V, it triggers this code.
What a healthy reading looks like
TPS voltage should increase smoothly from about 0.5V at closed throttle to around 4.5V at wide open throttle (WOT).
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 TPS connector for corrosion or loose connections. If found, repair or replace the connector.
- 22. Check the wiring between the TPS and ECM for damage or shorts. If wiring is damaged, repair it accordingly.
- 33. Using a multimeter, measure the TPS voltage at idle (should be around 0.5V). If not correct, replace the TPS.
- 44. Test the TPS through its full range while monitoring voltage. If it doesn't change smoothly up to 4.5V, replace the sensor.
Common causes
- Faulty throttle position sensor
- Electrical issues (wiring or connector faults)
- ECM malfunction
- Mechanical binding in the throttle body
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code active?
It's not recommended. The engine may run rough or stall, affecting drivability.
Will this code keep coming back after I clear it?
If the issue isn't fixed, yes, the code will likely return.
Why does this code sometimes pair with engine misfires?
An incorrect TPS signal can affect air-fuel mixture, leading to misfires.
Working a real vehicle right now?
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