SPN 105 FMI 0 — Intake Manifold (Charge Air) Temp — High
What it means: Intake-manifold (charge-air) temperature is above the high limit.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Inspect the CAC and radiator face for bugs, mud, and debris blocking airflow.
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Sparks, NV
Closest first. Tell them SPN 105 FMI 0 and what the truck is doing. RoadService.app lists these providers and does not employ them or carry out the repair.
- 0.0 mi away — based in Sparks, NV · (775) 355-6884
- 0.0 mi away — based in Sparks, NV · (775) 356-7200
- 0.0 mi away — based in Sparks, NV · (775) 359-0550
What SPN 105 FMI 0 means
Intake-manifold (charge-air) temperature is above the high limit. Hot intake air hurts power and combustion and the ECM will derate. It usually points to a charge-air-cooler (CAC) airflow or EGR-related problem.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Plugged/bug-packed CAC or radiator face restricting airflow
- CAC leak or restriction reducing cooling
- EGR over-flowing hot gas into the intake
- Intake-air temp sensor fault reading high (verify first)
First moves (roadside)
- Inspect the CAC and radiator face for bugs, mud, and debris blocking airflow.
- Check for CAC leaks/restriction and loose charge-air piping/boots.
- Reduce load on grades to keep intake temps in range until repaired.
- Confirm the reading is real before replacing the sensor.
Common misdiagnoses
- Replacing the sensor when a packed CAC face was the airflow restriction.
- Missing a charge-air leak that drives temps up.
- Ignoring an EGR fault adding heat to the intake.
FAQ
Intake-manifold (charge-air) temperature is above the high limit. Hot intake air hurts power and combustion and the ECM will derate. It usually points to a charge-air-cooler (CAC) airflow or EGR-related problem.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Plugged/bug-packed CAC or radiator face restricting airflow. Other possibilities include CAC leak or restriction reducing cooling; EGR over-flowing hot gas into the intake; Intake-air temp sensor fault reading high (verify first).
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside SPN 105 FMI 0, or share the same subsystem.
- Intake manifold temp — voltage high (SPN 105 FMI 3)
- Intake manifold temp — voltage low (SPN 105 FMI 4)
- Engine Protection — Power Derate Active (SPN 1569 FMI 31)
- Turbo Boost Pressure — High / Overboost (SPN 1127 FMI 16)
- Boost pressure high (SPN 102 FMI 0)
- Boost sensor — voltage low (SPN 102 FMI 4)
- Injection control pressure low (HEUI — older engines) (SPN 164 FMI 1)
- Fuel temperature high (SPN 174 FMI 16)
Same symptom: Low boost / low power
Other air-path codes that arrive as a truck that will not pull the hill it pulled yesterday.
- Turbo boost pressure high (SPN 1127 FMI 0) · Engine
- Turbo compressor inlet temp high voltage (SPN 1172 FMI 3) · Engine
- Turbo compressor inlet pressure — high voltage (SPN 1176 FMI 3) · Engine
- VGT actuator position — not responding (SPN 2795 FMI 7) · Engine
- VGT position — not responding (similar to 2795) (SPN 5571 FMI 7) · Engine
- Turbo turbine inlet temp — high voltage (SPN 5856 FMI 3) · Engine
Find a mechanic or related guides
General diagnostic guidance for heavy-duty diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack). Not a substitute for a scan-tool diagnosis on your specific truck.