Cummins Code 3714 indicates an engine protection torque derate condition. This code often appears alongside code 3712, signifying an issue with the aftertreatment SCR system. While replacing a faulty particulate sensor might resolve the underlying problem, codes 3712 and 3714 might persist due to a software issue. These codes can latch and require a specific procedure to clear.
This article outlines the conditions for clearing Cummins code 3714 and offers a potential solution based on a real-world experience with a 2017 ISB 6.7L engine.
Understanding Cummins Code 3714
Code 3714, “Engine Protection Torque Derate – Condition Exists,” signals that the engine’s computer (ECM) has detected a problem and reduced engine power to protect components from further damage. This derate often results in reduced performance and fuel efficiency. This code often appears with code 3712, “Aftertreatment SCR Operator Inducement – Data Valid but Above Normal Operational Range – Most Severe Level,” pointing to a potential issue with the Selective Catalytic Reduction (SCR) system responsible for emissions control.
According to Cummins documentation, both codes should clear once the root cause of the problem is addressed. The ECM is supposed to run a diagnostic test and turn off the associated warning lamps (red STOP ENGINE for 3712 and amber CHECK ENGINE for 3714) upon successful completion.
Troubleshooting a Persistent 3714 Code
Sometimes, even after repairing the initial fault (e.g., replacing a faulty sensor) and performing a successful regeneration and SCR test, codes 3712 and 3714 might remain. This can happen even when no other fault codes are present. In one instance, a 2017 ISB 6.7L engine experienced this issue. The vehicle underwent a particulate sensor replacement and passed subsequent regen and SCR tests, yet the codes persisted. All temperatures were within the normal operating range during the tests, further complicating the diagnosis.
Reflashing the ECM: A Potential Solution
When all other troubleshooting steps fail to clear persistent 3712 and 3714 codes, reflashing the ECM with the latest calibration might be necessary. In the case of the 2017 ISB 6.7L, reflashing the ECM successfully resolved the issue. The codes cleared, and the engine resumed normal operation. This suggests a potential software glitch within the ECM preventing the codes from clearing despite the resolution of the underlying hardware problem. Reflashing essentially updates the ECM’s software, potentially addressing bugs and ensuring proper code clearing functionality.
Conclusion
Cummins code 3714 indicates a serious engine derate condition that requires immediate attention. While addressing the root cause of the problem should theoretically clear the code, persistent 3712 and 3714 codes might indicate a software issue within the ECM. In such cases, reflashing the ECM to the latest calibration can provide a solution, restoring normal engine operation and clearing the persistent codes. If you encounter this issue, consult a qualified Cummins technician for proper diagnosis and repair.
