Cummins fault code 584
Starter Relay Driver Circuit: circuit voltage high / shorted high
What it means
Cummins' description: Starter Relay Driver Circuit - Voltage above normal, or shorted to high source.
SPN 677 is Engine Starter Motor Relay. FMI 3 means the voltage on the circuit is higher than possible for a good sensor, usually an open signal wire, a short to a power wire, or a failed sensor.
The ECM needs clean, steady battery voltage, and it supplies regulated 5-volt power to many sensors. Voltage problems can cause strange codes across many systems at once.
What the lamp means
An amber (yellow) warning lamp means the engine can usually keep running, but the fault should be repaired soon, ideally the same day.
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.
Keep an eye on it
A low-voltage code after a hard winter start or after the truck sat a while, then clears.
Schedule a repair
Codes return, the truck is slow to crank, or voltage reads low while driving. Test the charging system soon.
Stop and get help
Engine dies, several systems drop out at once, or the ECM loses power. Don't run it until the power supply is fixed. It can leave you stranded.
Common causes
FMI 3 is an electrical or signal fault, so start with the circuit:
- Loose or corroded battery cables or grounds
- Blown fuse or failed power relay
- Sensor supply shorted by one bad sensor or wire
- Damaged ECM power harness
If the circuit checks out, the reading may be real. Other possibilities: weak batteries; failing alternator; parasitic drain.
What you can check before calling
- Check battery terminals and ground straps for corrosion or looseness
- Have the batteries and alternator tested
- Note if several unrelated codes appeared at the same time
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers. For the bigger picture, read our guide: Bad alternator or bad battery? How to tell.
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
Related Battery, power supply and sensor supply codes
- 596 SPN 167 FMI 16
Electrical Charging System Voltage High: reading above normal (moderately severe) - 597 SPN 167 FMI 18
Electrical Charging System Voltage Low: reading below normal (moderately severe) - 598 SPN 167 FMI 1
Electrical Charging System Voltage Low: reading below normal (most severe) - 621 SPN 1137 FMI 18
Low #1 LB Cylinder Power: reading below normal (moderately severe) - 622 SPN 1138 FMI 18
Low #2 LB Cylinder Power: reading below normal (moderately severe) - 623 SPN 1139 FMI 18
Low #3 LB Cylinder Power: reading below normal (moderately severe)
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 584 mean?
Cummins fault code 584 is J1939 SPN 677 FMI 3: Starter Relay Driver Circuit - Voltage above normal, or shorted to high source. In plain terms: starter relay driver circuit: circuit voltage high / shorted high.
Can I keep driving with Cummins code 584?
Usually for a short time, if the engine runs normally and no other warnings are on. Get it diagnosed soon, because many amber codes lead to a derate if ignored. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 584?
SPN 677 identifies the part or system (Engine Starter Motor Relay). FMI 3 describes the type of failure: circuit voltage high / shorted high.
What usually causes Cummins code 584?
The most common causes are: loose or corroded battery cables or grounds; blown fuse or failed power relay; sensor supply shorted by one bad sensor or wire.
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.