Electronic Throttle Control Sensor A Range/Performance Problem
Problem detected in the electronic throttle control system.
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 ECU is getting a signal from the throttle position sensor that doesn’t match what it expects based on the accelerator pedal input.
What the computer is actually seeing
The vehicle’s computer measures a difference between the throttle position (TPS) and the expected position based on driver input. It monitors the throttle angle and the expected voltage, which should typically be 0.5 to 4.5 volts depending on throttle position, but sees discrepancies beyond the allowable range.
What a healthy reading looks like
TPS should read between 0.5V at closed throttle and 4.5V at wide open throttle; the difference between expected and actual readings must not exceed 10% of the full range.
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 throttle position sensor (TPS) connector for corrosion or damage. If damaged, repair or replace the connector.
- 22. Check the wiring continuity between the TPS and the ECU using a multimeter. Expected resistance should be close to zero ohms. If resistance is high, repair wiring.
- 33. Measure the voltage output of the TPS at idle and wide open throttle, expecting 0.5V and 4.5V respectively. If readings are out of range, replace the TPS.
- 44. Inspect the throttle body for carbon build-up or physical obstruction. Clean if required, then retest the TPS operation.
- 55. If all previous checks out, consider testing or replacing the ECU.
Common causes
- Faulty throttle position sensor
- Wiring issues between sensor and ECU
- Mechanical throttle linkage binding
- Dirty throttle body
- Failed ECU
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It may be drivable but with reduced power; it’s better to fix it soon.
Will this code come back after a reset?
Yes, if the underlying issue isn't fixed, the code is likely to return.
Why am I also seeing SPN 0123?
SPN 0123 indicates a high throttle signal; both codes can indicate issues with the throttle position sensor.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →