What does code P1120 mean?

Q: What does code P1120 mean?

Throttle Position Sensor 1 Circuit. P1120 on a GM vehicle indicates that the powertrain control module has detected an out-of-range or implausible signal from Throttle Position Sensor 1, which is the primary input for driver demand. The computer compares this signal against expected values and often against Throttle Position Sensor 2, and it sets the code when the voltage or correlation falls outside the calibrated window for a specified time.

DTC codes / GM codes / P1120

P1120 · GMThrottle Position Sensor 1 Circuit

P1120 on a GM vehicle indicates that the powertrain control module has detected an out-of-range or implausible signal from Throttle Position Sensor 1, which is the primary input for driver demand. The computer compares this signal against expected values and often against Throttle Position Sensor 2, and it sets the code when the voltage or correlation falls outside the calibrated window for a specified time.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.