29 March, 2025CAT 3126B Fault Code: 102-4 PID: Flash Code 25 SPN: 102 FMI: 4 Boost Pressure Short Circuit Vehicle speed is changing faster than is possible. If the progammed VSL Protection is progammed to 3000 rpm this diagnostic will not occur. 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.