SPN 164 FMI 1 — Injection control pressure low (HEUI — older engines)
What it means: Injection control pressure low (HEUI — older engines).
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Test HP oil system per MaxxForce procedure
Don't risk it — look up listed providers near you and give them this SPN/FMI when you call.
Listed providers nearest Salt Lake City, UT
Closest first. Tell them SPN 164 FMI 1 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 Salt Lake City, UT · (801) 531-9256
- 0.0 mi away — based in Salt Lake City, UT · (385) 503-8084
- 0.0 mi away — based in Salt Lake City, UT · (385) 386-4700
Applies to: Navistar · HEUI systems only
What SPN 164 FMI 1 means
Injection control pressure low (HEUI — older engines).
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- IPR valve
- High-pressure oil pump
- Injector oil rail leaks
First moves (roadside)
- Test HP oil system per MaxxForce procedure
FAQ
Injection control pressure low (HEUI — older engines).
Serious — Power derate likely — plan to stop soon.
The most common cause is: IPR valve. Other possibilities include High-pressure oil pump; Injector oil rail leaks.
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 164 FMI 1, or share the same subsystem.
- Engine Protection — Power Derate Active (SPN 1569 FMI 31)
- Intake Manifold (Charge Air) Temp — High (SPN 105 FMI 0)
- Turbo Boost Pressure — High / Overboost (SPN 1127 FMI 16)
- Boost pressure high (SPN 102 FMI 0)
- Boost sensor — voltage low (SPN 102 FMI 4)
- Intake manifold temp — voltage high (SPN 105 FMI 3)
- Intake manifold temp — voltage low (SPN 105 FMI 4)
- Fuel temperature high (SPN 174 FMI 16)
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.