P0124 — Throttle/Pedal Position Sensor A Circuit Intermittent
Moderate severityWhat it means
P0124 is stored when the engine control unit sees a fault involving throttle/pedal position sensor A. Throttle/pedal position sensor A tells the control unit how far the throttle or accelerator pedal is opened; it is central to drive-by-wire throttle control. An “intermittent” fault appears and clears on its own, which almost always means a connection problem rather than a dead part.
Common symptoms
- A warning light that comes and goes
- Hesitation, surging or poor throttle response
- Reduced power or limp mode
- Unstable idle
Likely causes
- Loose, backed-out or corroded connector pins
- Chafed wiring that shorts with movement or vibration
- Worn throttle position sensor or throttle body
- Connector or wiring fault
What to check first
- Wiggle-test the connector and harness while watching the live signal
- Watch the throttle/pedal percentage sweep smoothly from 0 to 100% in live data
- Inspect the connector and check whether a throttle relearn is needed
Can you keep driving?
Drive-by-wire faults often trigger reduced-power mode; diagnose promptly because throttle response can be unpredictable.
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