What does code P1123 mean?

Q: What does code P1123 mean?

Throttle Position Stuck Open. P1123 on Mazda vehicles means the powertrain control module (PCM) has detected that the throttle position sensor signal indicates the throttle plate is stuck open, or the PCM cannot command the throttle to close as expected. The PCM compares the throttle position sensor (TPS) voltage against the commanded throttle angle and sees a persistent mismatch where the throttle remains open beyond a calibrated threshold.

DTC codes / Mazda codes / P1123

P1123 · MazdaThrottle Position Stuck Open

P1123 on Mazda vehicles means the powertrain control module (PCM) has detected that the throttle position sensor signal indicates the throttle plate is stuck open, or the PCM cannot command the throttle to close as expected. The PCM compares the throttle position sensor (TPS) voltage against the commanded throttle angle and sees a persistent mismatch where the throttle remains open beyond a calibrated threshold.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

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