Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 2718 PID: SPN: 520325 FMI: 31 Brake and Throttle Conflict- Condition Exists

Circuit Description
The accelerator pedal contains two position sensors. These position sensors are used to measure the throttle position. Both position sensors receive a 5 volt supply from the ECM. A corresponding signal voltage based on the position of the accelerator pedal is then received from the ECM. The signal voltage for accelerator position 1 is twice as much as the signal voltage from the accelerator position 2.

The accelerator position sensor is a Hall effect sensor attached to the accelerator pedal. The accelerator position sensor varies the signal voltage to the engine control module (ECM) as the accelerator pedal is depressed and released. Low signal voltage is received by the ECM when the accelerator pedal is at 0 percent. A high signal voltage is received by the ECM when the accelerator pedal is at 100 percent. The accelerator pedal position circuit contains an accelerator pedal position 5 volt supply, accelerator pedal position return, and accelerator pedal position signal.

Component Location
The accelerator pedal or lever position sensor is mounted to the accelerator pedal assembly. Refer to the OEM service manual.

The brake pedal position switch is mounted to the brake pedal. Refer to the OEM service manual.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the vehicle is in motion, if the feature is enabled.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the accelerator pedal and brake pedal were depressed simultaneously.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
The engine will have limp-home throttle control only.
Conditions for Clearing the Fault Code
To validate the repair, it may be necessary to operate the vehicle on a chassis dynamometer or to drive the vehicle.

The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk
This fault code is intended to detect conditions where both the accelerator pedal and brake pedal were depressed at the same time. When this condition occurs, the accelerator pedal position is defaults to idle. If the fault occurs when both pedals are NOT depressed, this may indicate that either the accelerator pedal position or brake pedal position are NOT returning to 0 percent.

Possible Cause:
1) ECM calibration