Diagnostic Trouble Code
P0120 — Throttle Position Sensor A — Circuit Malfunction
Throttle Position Sensor A — Circuit Malfunction
Definition
The ECM has detected a voltage signal from throttle position sensor A that is outside the expected range. The TPS tells the ECM how far the throttle blade is open so it can calculate proper fuel delivery and ignition timing.
Common Causes
- Worn or failed throttle position sensor
- Damaged wiring or connector at the TPS
- Dirty or carbon-fouled throttle body
- Failed electronic throttle body assembly