Cummins fault code 617
High Turbo Compressor Inlet Temp LB: reading above normal (most severe)
What it means
Cummins' description: High Turbo Compressor Inlet Temp LB.
SPN 1172 is High Turbo Compressor Inlet Temp LB. FMI 0 means the sensor is working, but the value it reports is far above where it should be. This is the most severe 'high' level.
The turbocharger forces air into the engine. Most modern Cummins engines use a variable geometry turbo (VGT) with an electronic actuator. The ECM watches intake manifold pressure, turbo speed and compressor temperatures to control boost.
What the lamp means
This code normally doesn't turn on a dash lamp. It's logged in the ECM for a technician to see, and often explains another active code.
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 brief underboost code climbing a hill that clears, with normal power the rest of the time.
Schedule a repair
Noticeable power loss, black smoke, or amber lamp with a boost or VGT code. Get it checked. Boost leaks and sticky VGT actuators get worse and hurt fuel economy.
Stop and get help
Loud whine or grinding from the turbo, heavy smoke, oil pouring out of the exhaust, or a stop lamp. Shut it down. A failing turbo can feed parts or oil into the engine.
Common causes
The sensor reading itself is out of range or the condition is real, so look at the system:
- Boost leak: split charge air hose, loose clamp, cracked charge air cooler
- VGT vanes sticking from soot
- Worn or damaged turbo
- Clogged air filter or intake restriction
- Exhaust restriction from a plugged DPF
What you can check before calling
- Listen for a new hiss or whistle under load, a typical sign of a boost leak
- Check charge air hoses and clamps for oil or soot
- Check the air filter restriction indicator
- Notice whether power loss happens only under heavy load or on hills
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
- 691 SPN 1172 FMI 3
Turbocharger 1 Compressor Intake Temperature Circuit: circuit voltage high / shorted high - 692 SPN 1172 FMI 4
Turbocharger 1 Compressor Intake Temperature Circuit: circuit voltage low / shorted low - 693 SPN 1172 FMI 2
Turbocharger 1 Compressor Intake Temperature: erratic or intermittent signal - 3369 SPN 1172 FMI 9
Turbocharger 1 Compressor Intake Temperature Sensor: abnormal update rate - 3371 SPN 1172 FMI 19
Turbocharger 1 Compressor Intake Temperature Sensor: network data error
Related Turbo, VGT and boost codes
- 616 SPN 1173 FMI 16
High Turbo Compressor Inlet Temp RB: reading above normal (moderately severe) - 629 SPN 1176 FMI 18
Turbocharger 1 Compressor Intake Pressure: reading below normal (moderately severe) - 595 SPN 103 FMI 16
Turbocharger 1 Speed: reading above normal (moderately severe) - 686 SPN 103 FMI 2
Turbocharger 1 Speed: erratic or intermittent signal - 687 SPN 103 FMI 18
Turbocharger 1 Speed: reading below normal (moderately severe) - 694 SPN 1173 FMI 3
RBF Turbo Comp Inlet Temp Sens Failed High: circuit voltage high / shorted high
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 617 mean?
Cummins fault code 617 is J1939 SPN 1172 FMI 0: High Turbo Compressor Inlet Temp LB. In plain terms: high turbo compressor inlet temp lb: reading above normal (most severe).
Can I keep driving with Cummins code 617?
Usually, yes. This code doesn't normally turn on a lamp by itself, but check for other active codes that might be more serious. Look at the green, yellow and red examples on this page to judge your situation.
What is the SPN and FMI for Cummins code 617?
SPN 1172 identifies the part or system (High Turbo Compressor Inlet Temp LB). FMI 0 describes the type of failure: reading above normal (most severe).
What usually causes Cummins code 617?
The most common causes are: boost leak: split charge air hose, loose clamp, cracked charge air cooler; vGT vanes sticking from soot; worn or damaged turbo.
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.