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

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.

Symptoms

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

Most likely causes

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

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pedal and throttle connectors
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Use live data to confirm that both sensors rise smoothly and consistently
4. Clean the throttle if it has carbon buildup
5. Run the relearn procedure with the scanner if the manufacturer requires it
6. Replace the part identified by the diagnosis

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2124 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 1: Air and fuel
• 24: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2124?

Be careful: the car may suddenly lose power. If it goes into limp mode, get off the highway and calmly make your way to a repair shop.

What causes code P2124?

The most common causes are: pedal harness pinched or chafed by a misrouted path; loose terminal or weak pin tension at the pedal connector; worn spot on track D inside the pedal sensor.

Related codes

• P2120Throttle/Pedal Position Sensor/Switch D Circuit
• P2122Throttle/Pedal Position Sensor/Switch D Circuit Low
• P2123Throttle/Pedal Position Sensor/Switch D Circuit High
• P2129Throttle/Pedal Position Sensor/Switch E Circuit Intermittent
• P2138Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

Sources

• static.nhtsa.gov: MC 10119677 9999
• static.nhtsa.gov: MC 10125085 9999
• gsi.ext.gm.com: 07 GRP12 All Engines
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.