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.
Frequently asked questions
What is the most common cause of P0124?
The most likely cause is: Loose, backed-out or corroded connector pins. Several other faults can set P0124 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0124 and keep driving?
Clearing P0124 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0124?
P0124 is a moderate-severity code. The car is often still drivable, but have it diagnosed soon — the underlying problem can get worse and it may fail an emissions test.
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