Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 6254 PID: SPN: 5246 FMI: 16 Aftertreatment SCR Operator Inducement Severity- Data Valid But Above Normal Operating Range- Moderately Severe Level - EcuForce Truck (2024)

FAQs

How do I get my cummins out of derate? ›

A derate is designed to protect you from causing engine or DPF damage. A derate can be caused by various sensors or systems. However, when it's a specific 5 MPH derate then you can be certain that the problem is related to the emissions, aka the aftertreatment system.

The 5246 fault is just an inducement fault. This means that derates are active presently. Now on your nox readings, How far into the regen was this noted?

Inducements can be engine derates, vehicle speed limits, system lockouts, or any other action intended to prompt the operator in performing repair or maintenance on the emissions control system.

One of the most efficient DEF fluid disposal methods is taking it to a recycling center. Many recycling centers accept used DEF fluid and process it according to regulatory guidelines. To locate a recycling center near you, visit Earth911 for a comprehensive list of facilities.

The problem is that if the def injector is not spraying def fluid into the exhaust, it will be a domino effect in that the dpf filter will start sooting and the exhaust temp sensors will have incorrect readings, which the net result will still be going into limp mode.

A truck engine delete is a kit that mechanics use to deactivate a diesel particulate filter (DPF) — a factory-installed device that traps soot, ash and other contaminants found in diesel exhaust. A DPF delete kit contains two components — an exhaust and a tuner.

A derate means that the program inside the engine computer limits either the power or vehicle speed. A derate is designed to protect you from causing engine or DPF damage. A derate can be caused by various sensors or system.

Codes 6254, 6255, & 3712 are all derated codes that occur when another fault is causing the actual problem. As you can see from the list, the diesel exhaust fluid (DEF) codes are the top 3 most common fault codes if you ignore the derate codes.

What does DPF full engine derated mean? ›

The DPF works under extreme conditions, collecting the ash that results from burning diesel. The engine can derate when a needed regeneration does not occur. When an engine derates, it can cause downtime by leaving the vehicle in an undrivable state or “limping mode” where it's only operable at low speeds.

Engine derating is the reduction of an engine's output due to less-than-ideal operating conditions. Derating sometimes is done intentionally when you want to prolong the engine's life and avoid substantial wear or damage.

Power surges, spikes, disturbances, over voltage conditions present in the 3 Phase Power distribution circuits can cause SCR's to breakdown and short.

What does this mean and what can we do to correct it? SCR means Selective Cataylst Reduction. This is the system that injects DEF fluid in the exhaust to reduce emissions. Most causes are contaminated DEF fluid, if diesel or water was accidently mixed with Def, the system will pick this up and throw a fault code.

Cummins Fault codes 3712 and 3714. If these fault codes are active, this means the engine performance is already reduced (power derate) and possibly the vehicle speed is also limited. Both are information-only fault codes which appear when the ECM detects active critical fault codes related to engine operation.

The DPF works under extreme conditions, collecting the ash that results from burning diesel. The engine can derate when a needed regeneration does not occur. When an engine derates, it can cause downtime by leaving the vehicle in an undrivable state or “limping mode” where it's only operable at low speeds.