Fault code 3712 on a Cummins engine, specifically “Aftertreatment SCR Operator Inducement – Data Valid but Above Normal Operational Range – Most Severe Level,” often appears alongside code 3714, indicating a derate condition. This article outlines the conditions for clearing these codes and a potential solution based on a real-world experience.
Cummins fault code 3712 signifies an issue with the Selective Catalytic Reduction (SCR) system. The code suggests that the data received from the SCR system is valid, but the values are exceeding the normal operational range. This typically indicates a problem within the SCR system itself, rather than a faulty sensor.
The official guidelines for clearing fault code 3712 state that it should become inactive once all other active fault codes are addressed. The Engine Control Module (ECM) will then turn off the red STOP ENGINE lamp after a successful diagnostic run. Fault code 3714, “Engine Protection Torque Derate – Condition Exists,” follows a similar clearing procedure, with the amber CHECK ENGINE lamp turning off upon successful diagnosis.
However, a real-world scenario encountered on a 2017 ISB 6.7L Cummins engine revealed a situation where codes 3712 and 3714 persisted even after addressing all other fault codes and performing a successful regeneration and SCR test. The issue was resolved by reflashing the ECM with the latest calibration. This suggests that in some cases, these codes can become latched due to a software issue, requiring a recalibration to clear. Reinstalling the same calibration has also proven effective in situations where a newer update isn’t available.
In conclusion, while Cummins fault code 3712 typically clears after addressing underlying issues, persistent occurrences may require an ECM reflash to resolve potential software-related problems. This highlights the importance of considering software updates as a potential solution when troubleshooting complex engine codes.
