25 March, 2025CAT 3126B Fault Code: 91-13 PID: Flash Code 28 SPN: FMI: Throttle Sensor Calibration During the last 90 seconds of the idle shutdown mode after the Check Engine/Service Soon Lamp begins to flash, the brake or clutch pedal is depressed or released. NOTE: This diagnostic code represents an event and not Electronic system fault. Share on Facebook Opens in a new window. Tweet on Twitter Opens in a new window. Pin on Pinterest Opens in a new window. Back to blog Leave a comment Name * Email * Comment * Please note, comments need to be approved before they are published.