How to Change a Speed Governor on a Freightline...

Want to increase or lower your truck’s top speed? Freightliner trucks with Cummins or Detroit engines allow you to change the road speed governor—as long as you have the right...

SPN 5246: What It Means and How to Clear It

This is a derate trigger code, often caused by unresolved DPF or DEF system issues. Clearing it requires more than just hitting "reset." Fix the underlying issue (e.g. failed regen,...

SPN 3719: DPF Soot Load Too High — How to Recov...

This code indicates the filter is overloaded. You’re one step away from derate. Fix: Perform a parked or forced regen Use live data to confirm soot %, exhaust temp, and...

Cummins Fault Code 3251 – Diesel Oxidation Cata...

Cummins Fault Code 3251 is a critical aftertreatment code that signals your Diesel Oxidation Catalyst (DOC) is not operating efficiently. This usually appears with SPN 3251 FMI 0, which translates...

Cummins Fault Code 3231 – How to Fix SCR Intake...

Fault Code 3231 on Cummins engines indicates a problem with the SCR intake temperature sensor, a critical component in the aftertreatment system. When this sensor fails, it can trigger SPN...

SPN 2791: EGR Low Flow Detected – What to Do

This EGR-related code often shows up on MaxxForce and International engines. Symptoms: Hard starts, surging, black smoke Check for clogged EGR cooler, bad valve, sensor issues Use your scanner to...