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P0172 — Fuel System Too Rich Bank 1
CautionFuelLimp to the next safe stop
Seen on: Heavy Truck/Diesel
Fuel System Too Rich Bank 1. Common causes: Faulty injector dripping.
Don't risk it — get a diesel tech on the truck.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Caution. Limp to the next safe stop.
Most likely causes
- Faulty injector dripping
- Stuck fuel pressure regulator
- leaking injector
First moves (roadside)
- Perform injector balance rate test
- check FPR
FAQ
What does P0172 mean?
Fuel System Too Rich Bank 1. Common causes: Faulty injector dripping.
How serious is P0172?
Caution — Limp to the next safe stop.
What's the most likely cause of P0172?
The most common cause is: Faulty injector dripping. Other possibilities include Stuck fuel pressure regulator; leaking injector.
Can I keep driving with P0172?
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Throwing this code right now?
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.