Cummins fault code 111
ECM Critical Internal Failure: bad device or component
What it means
Cummins' description: Engine Control Module Critical Internal Failure - Bad intelligent device or component.
SPN 629 is Controller #1. FMI 12 means a smart device or module reported that it has failed internally.
The engine ECM talks to the transmission, ABS, dash and aftertreatment modules over the J1939 data network. These codes mean the ECM itself, its calibration, or its communication with other modules has a problem.
What the lamp means
A red stop lamp means Cummins treats this as serious. Stop the engine as soon as you can do it safely and get it checked before running it again.
Green, yellow, red: three ways this can look
The same code can be a quick fix or a reason to shut down. Match your situation to the closest example. Cummins rates this a red stop lamp code, so if the red lamp is on, go by the red example.
Keep an eye on it
A network timeout logged once, often during cranking, that cleared.
Schedule a repair
Gauges dropping out, the transmission or ABS acting odd, or codes returning. Book diagnosis. These can go from annoying to stranded quickly.
Stop and get help
Red lamp for an ECM internal failure, or the engine won't start or shuts down. Get it towed or seen where it sits.
Common causes
FMI 12 is an electrical or signal fault, so start with the circuit:
- J1939 network wiring damaged or shorted
- Missing or failed terminating resistor
- Corroded connector at a module
- Another module on the network failed or lost power
- Low battery voltage during cranking
If the circuit checks out, the reading may be real. Other possibilities: eCM calibration doesn't match the vehicle or another module; eCM internal failure.
What you can check before calling
- Note which other systems acted up: gauges, transmission, ABS
- Check for recent electrical work or aftermarket devices plugged into the diagnostic port
- Check batteries and grounds
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
Listed by Cummins for: QSB 6.7, QSL 9, QSX 15, QSB 4.5, QSF 3.8, QSG 12. Cummins uses the same fault code numbers across its electronic engines, including on-highway models like the ISB/B6.7, ISL/L9 and ISX/X15, though not every code applies to every engine or software level. Source: Cummins Tier 4 Fault Codes. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Same SPN, other failure types
- 343 SPN 629 FMI 12
ECM Warning Internal Hardware Failure: bad device or component - 375 SPN 629 FMI 2
Fuel Pump Control Module, Electronic Calibration Code Error: erratic or intermittent signal - 2661 SPN 629 FMI 31
At Least One Unacknowledged Most Severe Fault: condition exists - 2662 SPN 629 FMI 31
At Least One Unacknowledged Moderately Severe Fault: condition exists
Related ECM, network and data link codes
- 184 SPN 609 FMI 2
ECM Identification Input State Error: erratic or intermittent signal - 185 SPN 639 FMI 2
ECM Network Communication Error: erratic or intermittent signal - 211 SPN 1484 FMI 31
Additional OEM/Vehicle Diagnostic Codes have been logged. Check other ECM's for DTC's.: condition exists - 269 SPN 1195 FMI 2
Antitheft Password Valid Indicator: erratic or intermittent signal - 285 SPN 639 FMI 9
SAE J1939 Multiplexing PGN Timeout Error: abnormal update rate - 286 SPN 639 FMI 13
SAE J1939 Multiplexing Configuration Error: out of calibration
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does Cummins fault code 111 mean?
Cummins fault code 111 is J1939 SPN 629 FMI 12: Engine Control Module Critical Internal Failure - Bad intelligent device or component. In plain terms: ecm critical internal failure: bad device or component.
Can I keep driving with Cummins code 111?
No. Cummins assigns this code a red stop lamp. Stop the engine as soon as it's safe and have it checked before running it again. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 111?
SPN 629 identifies the part or system (Controller #1). FMI 12 describes the type of failure: bad device or component.
What usually causes Cummins code 111?
The most common causes are: j1939 network wiring damaged or shorted; missing or failed terminating resistor; corroded connector at a module.
Diesel down in the Midlands?
We work on Cummins-powered pickups, vans and medium-duty trucks across Lexington, Columbia and the Midlands, on site at your yard or roadside.