P0124
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Throttle control
Generic OBD-II
High
What it means
P0124 means the throttle or pedal position sensor "A" signal is dropping out or jumping intermittently. This sensor tells the ECM how far the throttle is open, so an unstable signal can cause surging, hesitation, erratic idle, and on drive-by-wire systems a protective reduced-power mode. It usually traces to a loose connector or a worn sensor.
High
Can I keep driving? Drivable but unpredictable — an intermittent throttle signal can cause surging, hesitation, or a sudden drop into reduced-power/limp mode, so repair promptly.
Common symptoms
What you'll notice
- Check-engine light on
- Jerky or hesitant throttle response
- Surging or unexpected changes in RPM/idle
- Reduced-power or limp-home mode
- Possible stalling
Common causes
Most likely first
- Worn or faulty throttle/pedal position sensorLikely
- Loose or corroded sensor connectorCommon
- Chafed or intermittently shorting signal wiringCommon
- Less commonly, an ECM/PCM faultLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data, then monitor the live throttle/pedal position signal for dropouts or spikes.
- Wiggle-test the connector and harness while watching the live value.
- Inspect and clean the connector; repair damaged wiring.
- Replace the throttle or pedal position sensor if the signal is erratic, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P0124?+
Drive with caution. The car may surge, hesitate, or drop into reduced-power mode without warning, which can be unsafe in traffic. Repair it promptly.
Can I just clear P0124?+
It will return while the fault is intermittent. Trace the loose connector, worn sensor, or damaged wire causing the dropout.
Related codes
Often seen with P0124
Read & clear P0124 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX