CID 1117 Fault Code Explained and How to Fix It
Learn what triggers CID 1117 fault code, how to diagnose it, and how to fix it by checking ECM power supply, wiring, and fuses.
Learn what triggers CID 1117 fault code, how to diagnose it, and how to fix it by checking ECM power supply, wiring, and fuses.
CID 1117 indicates a loss of ECM power during the ignition-on state, which means the Electronic Control Module (ECM) failed to receive adequate power, resulting in a potential shutdown or refusal to restart. This fault is particularly common in Cummins engines and can prevent normal engine operation. The engine may experience sudden shutdowns, erratic behavior, or limp mode. To fix the issue, it’s important to track down the power supply source and resolve any wiring or connection problems.
CID 1117 refers to a power supply fault where the ECM loses power while the ignition is still turned on. This typically happens when the power supply drops below an acceptable level or is interrupted. FMI 7 is used to indicate that there is a mechanical or communication fault in the system, meaning the ECM cannot communicate properly due to power loss.
This fault occurs when:
These symptoms are typically temporary until the fault is fixed, but ignoring them can lead to ongoing problems with engine performance.
Ensure that the batteries are fully charged and providing at least 12.6V (for 12V systems) or 25.2V (for 24V systems). This is the most basic check to ensure the power supply to the ECM is stable.
Inspect all battery terminals for corrosion or damage. Ensure the fuses are properly seated, especially the ones related to the ECM or the battery junction. Replace any blown fuses.
Check the wiring between the ECM and battery supply. Look for any damage, chafing, or corrosion that could interrupt power flow. Pay close attention to the negative and positive ground connections to ensure they are free of corrosion.
With the engine off, lightly tap the ECM with a soft hammer or similar tool. If the engine starts after tapping, the fault may be related to an internal ECM failure (cold solder joint or internal damage).
After all checks and repairs, use diagnostic software to reset the ECM’s power supply system and clear any active fault codes. If you suspect internal issues with the ECM itself, you may need to replace it.
Clue’s Fleet Management and Preventive Maintenance solutions are essential tools for preventing SPN 1117 from recurring:
CID 1117 is triggered when the ECM loses power while the key is in the “ON” position, often due to wiring issues, faulty connectors, or damaged battery terminals.
Yes, blown fuses, especially those related to ECM or battery circuits, can cause CID 1117. Always check for fuse integrity before proceeding with further diagnostics.
Yes, if you have experience with vehicle wiring, you can troubleshoot and repair the wiring connections or battery terminals. For ECM-related faults, you may need specialized tools.
Yes, Clue’s Preventive Maintenance solution allows you to schedule checks on wiring and battery health to avoid CID 1117 from disrupting operations. Clue’s Fleet Management system provides visibility into power issues, helping you address them proactively.
Regular inspections should be part of your annual maintenance schedule. Additionally, monitor for any signs of power loss during diagnostic checks for optimal fleet performance.
