SPN 110 FMI 4 — Coolant temp sensor — voltage low
What it means: Coolant temp sensor — voltage low.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Start with the most likely cause: Short to ground.
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 110 FMI 4 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: Detroit · Navistar · Paccar · Volvo
What SPN 110 FMI 4 means
Coolant temp sensor — voltage low.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Short to ground
- Short ground
FAQ
Coolant temp sensor — voltage low.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Short to ground. Other possibilities include Short ground.
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 110 FMI 4, or share the same subsystem.
- Engine Coolant Temperature — Too High (SPN 110 FMI 0)
- Coolant temp sensor — voltage high (SPN 110 FMI 3)
- Coolant temperature — moderately high (SPN 110 FMI 16)
- Coolant level — low (SPN 111 FMI 1)
- Engine Coolant Over-Temperature Condition (P0217)
- Coolant Thermostat Below Regulating Temperature (P0128)
- Fan 1 Control Circuit Malfunction (P0480)
- Fan 2 Control Circuit Malfunction (P0481)
Same symptom: Charging and voltage
Other codes that trace back to voltage — one bad ground can set half a dozen of them at once.
- Oil pressure sensor — voltage high (SPN 100 FMI 3) · Lubrication
- Oil pressure sensor — voltage low (SPN 100 FMI 4) · Lubrication
- Boost sensor — voltage low (SPN 102 FMI 4) · Engine
- Intake manifold temp — voltage high (SPN 105 FMI 3) · Engine
- Intake manifold temp — voltage low (SPN 105 FMI 4) · Engine
- Turbo compressor inlet temp high voltage (SPN 1172 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.