Brake Pedal Position / Accelerator Pedal Position Incompatible
Diagnostic trouble code P2299 indicates that the engine control module (ECM) has detected simultaneous application of both the brake pedal and the accelerator pedal. This code is set when the ECM receives conflicting signals from the brake pedal position switch and the accelerator pedal position sensor for a predetermined amount of time.
This code often triggers a fail-safe or limp mode that restricts engine power to prevent unintended acceleration. It should be addressed promptly to restore normal vehicle drivability and ensure safety.
Common symptoms
- Illuminated Check Engine Light
- Reduced engine power or limp mode activation
- Lack of throttle response when pressing the accelerator
- Cruise control system disabled
- Brake lights remaining illuminated continuously (if brake switch is stuck)
Likely causes
- Driver habit of resting a foot on the brake pedal while accelerating (two-foot driving)
- Faulty or misadjusted brake pedal position switch
- Faulty accelerator pedal position (APP) sensor
- Damaged wiring or loose connections in the brake switch circuit
- Damaged wiring or loose connections in the APP sensor circuit
- Debris lodged under the brake or accelerator pedal preventing full return
What to check before replacing parts
Interview the driver regarding their driving habits.
Look for: Determine if the driver uses a two-foot driving technique, resting their left foot on the brake pedal while accelerating, which is the most common cause of this code.
Check the pedal areas for physical obstructions.
Look for: Look for floor mats, debris, or ice that might be preventing either the brake pedal or the accelerator pedal from returning fully to their resting positions.
Monitor live data for the brake switch and APP sensor using a scan tool.
Look for: Observe the brake switch status (ON/OFF) and APP sensor voltage percentages without touching the pedals; the brake should read OFF and APP should read near 0%.
Inspect the brake pedal position switch adjustment and physical operation.
Look for: Verify that the switch plunger fully extends and retracts with pedal movement, and check for a broken return spring or misaligned bracket.
Perform a visual inspection of the wiring harnesses for both pedal sensors.
Look for: Look for chafed wires, corroded pins, or loose connectors at both the brake pedal switch and the accelerator pedal position sensor.
This page explains the generic P2299 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
Gear guide: Best OBD2 ScannersRead this code yourself next time — from $20 Bluetooth dongles to bidirectional scan tools.Rather have a pro handle it? Find a vetted local mechanic.