P0094 — Fuel System Leak Detected - Small
What it means: Fuel System Leak Detected - Small.
How serious / can you keep driving: Serious. Power derate likely — plan to stop soon.
Check first: Inspect HP lines carefully
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Phoenix, AZ
Closest first. Tell them P0094 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 Phoenix, AZ · (623) 304-4187
- 0.0 mi away — based in Phoenix, AZ · (480) 458-7715
- 0.0 mi away — based in Phoenix, AZ · (480) 530-7347
Seen on: Heavy Truck/Diesel
What P0094 means
Fuel System Leak Detected - Small. Common causes: Small fuel system leak detected.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Small fuel system leak detected
- Micro-crack in HP line
- beginning injector wear
First moves (roadside)
- Inspect HP lines carefully
- measure injector return flow balance
- replace suspect injectors
FAQ
Fuel System Leak Detected - Small. Common causes: Small fuel system leak detected.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Small fuel system leak detected. Other possibilities include Micro-crack in HP line; beginning injector wear.
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 P0094, or share the same subsystem.
- Injector Metering Rail 1 Pressure - Data Valid But Below Normal Operating Range (XPI common rail fuel pressure too low) (SPN 157 FMI 1)
- Fuel Delivery Pressure — Low (SPN 94 FMI 1)
- Injection Rail Pressure — Below Normal (SPN 157 FMI 18)
- Injector Metering Rail 1 Pressure - Data Valid But Above Normal Operating Range (XPI common rail fuel pressure too high) (SPN 157 FMI 0)
- Injector #1 open circuit (SPN 651 FMI 5)
- Injector #2 open circuit (SPN 652 FMI 5)
- Injector #3 open circuit (SPN 653 FMI 5)
- Injector #4 open circuit (SPN 654 FMI 5)
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.