P0172 — Fuel System Too Rich Bank 1
What it means: Fuel System Too Rich Bank 1.
How serious / can you keep driving: Caution. Limp to the next safe stop.
Check first: Perform injector balance rate test
Don't risk it — look up listed providers near you and give them this code when you call.
Listed providers nearest Macon, GA
Closest first. Tell them P0172 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 Macon, GA · (478) 538-3245
- 0.0 mi away — based in Macon, GA · (478) 216-8330
- 0.0 mi away — based in Macon, GA · (706) 536-3376
Seen on: Heavy Truck/Diesel
What P0172 means
Fuel System Too Rich Bank 1. Common causes: Faulty injector dripping.
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
Fuel System Too Rich Bank 1. Common causes: Faulty injector dripping.
Caution — Limp to the next safe stop.
The most common cause is: Faulty injector dripping. Other possibilities include Stuck fuel pressure regulator; leaking injector.
Limp to the next safe stop. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Related codes
Codes that commonly appear alongside P0172, 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)
Same symptom: Fuel delivery
Other codes on the tank-to-injector path — pressure, filters, water and the pump.
- Fuel System Leak Detected - Large Leak (P0093) · Fuel System
- HP Fuel Rail Pressure Low During Power Enrichment (P1093) · Fuel System
- High-Pressure Fuel System Relief Valve Open (P2BAD) · Fuel System
- Injector #5 open circuit (SPN 655 FMI 5) · Fuel System
- Injector #6 open circuit (SPN 656 FMI 5) · Fuel System
- Fuel Rail/System Pressure Too Low (P0087) · Fuel System
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.