P2124: Throttle/Pedal Position Sensor/Switch D Circuit Intermittent

What does P2124 mean?

P2124 covers brief dropouts or spikes on pedal track D that come and go too quickly to count as a steady low or high fault. Ford documents it: special service messages 46829 (2015-2017 F-150) and 46880 (2017 Super Duty built up to late August 2017) tie P2124, alongside other pedal codes and wrench, ABS, airbag and hill descent lamps, to a pedal harness routed behind the bracket between brake booster and brake pedal, where it gets pinched and damaged. GM publishes no separate intermittent code for track D and catches such glitches through the 19-of-39 counter of P2120, P2122 and P2123. Inspect the harness while moving the pedal slowly. Effects range from a passing warning lamp to sudden loss of pedal response.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Warning lamps that come and go, sometimes several at once
• Brief loss of pedal response while driving
• Reduced power mode after repeated dropouts

Common causes

• High Pedal harness pinched or chafed by a misrouted path
• Medium Loose terminal or weak pin tension at the pedal connector
• Medium Worn spot on track D inside the pedal sensor

Likelihood is a general estimate across vehicles; your make and model may differ.