Cummins fault code 514
Fuel Control Valve: not responding / out of adjustment
What it means
Cummins' description: Fuel Control Valve - mechanically stuck.
SPN 633 is Fuel Control Valve. FMI 7 means the ECM commanded something to move or change and it didn't respond the way it should: sticking, binding, worn, or out of adjustment.
Modern Cummins engines build very high fuel pressure in a common rail that feeds the injectors. The ECM controls rail pressure with a fuel pump actuator and monitors it with a rail pressure sensor. A pressure relief valve protects the system.
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 low rail pressure code right after a filter change or running the tank low, that clears once air is bled out.
Schedule a repair
Hard starts, hesitation, power loss, or the code keeps coming back. Change the fuel filters first, then have the pressure tested.
Stop and get help
Stalling, no-start, a red stop lamp, or fuel spraying anywhere. Shut it down. High-pressure fuel leaks are a fire and injury risk.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Clogged fuel filters (the most common cause of low rail pressure)
- Air in the fuel from a loose fitting or empty tank
- Weak lift pump or restricted fuel supply
- Worn high-pressure pump
- Injector leaking back too much fuel
- Pressure relief valve opening or leaking
What you can check before calling
- Check when the fuel filters were last changed
- Make sure there's plenty of fuel in the tank
- Look for fuel leaks at the pump, rail and lines
- Notice hard starting, stalling or power loss under load
Clearing the code without fixing the cause usually brings it right back, and on emissions systems it can restart derate timers.
Engines and sources
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: Diagnostic Fault Codes for Cummins Engines. Always confirm with Cummins service information (QuickServe) for your engine serial number.
Same SPN, other failure types
- 276 SPN 633 FMI 3
Fuel Injection Control Valve Circuit: circuit voltage high / shorted high - 277 SPN 633 FMI 7
Fuel Injection Control Valve: not responding / out of adjustment - 279 SPN 633 FMI 4
Fuel Injection Control Valve Circuit: circuit voltage low / shorted low - 378 SPN 633 FMI 5
Fueling Actuator #1 Circuit: circuit open / current low - 379 SPN 633 FMI 6
Fueling Actuator #1 Circuit: circuit grounded / current high - 455 SPN 633 FMI 3
Fuel Control Valve Circuit: circuit voltage high / shorted high - 468 SPN 633 FMI 2
Fuel Rail Actuator Circuit: erratic or intermittent signal - 539 SPN 633 FMI 11
Injector Control Valve Electronic Filter (Transorb) Error: root cause not known
Related High-pressure fuel system codes
- 517 SPN 1076 FMI 12
Fuel Metering Solenoid: bad device or component - 486 SPN 1349 FMI 18
Injector Metering Rail #2 Pressure Low: reading below normal (moderately severe) - 485 SPN 1349 FMI 16
Injector Metering Rail #2 Pressure High: reading above normal (moderately severe) - 484 SPN 1349 FMI 4
Injector Metering Rail 2 Pressure Sensor Circuit: circuit voltage low / shorted low - 483 SPN 1349 FMI 3
Injector Metering Rail 2 Pressure Sensor Circuit: circuit voltage high / shorted high - 482 SPN 94 FMI 18
Fuel Pressure Low: 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 514 mean?
Cummins fault code 514 is J1939 SPN 633 FMI 7: Fuel Control Valve - mechanically stuck. In plain terms: fuel control valve: not responding / out of adjustment.
Can I keep driving with Cummins code 514?
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 514?
SPN 633 identifies the part or system (Fuel Control Valve). FMI 7 describes the type of failure: not responding / out of adjustment.
What usually causes Cummins code 514?
The most common causes are: clogged fuel filters (the most common cause of low rail pressure); air in the fuel from a loose fitting or empty tank; weak lift pump or restricted fuel supply.
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.