Diesel Fault Code Finder
Decode fault codes, SPN/FMI pairs, and flash codes for Cummins, Duramax, Power Stroke, PACCAR, Detroit Diesel, and CAT engines. Causes, diagnostics, and real-world fixes -- free.
Heavy-Duty Truck Engines
Class 7-8 on-highway diesels. J1939 SPN/FMI fault reporting.
Cummins ISX / X15
ISX, X15, ISL, ISC -- big bore Class 8 & medium-duty.
Detroit Diesel
DD13, DD15, DD16 -- Freightliner Cascadia & Western Star.
PACCAR MX
MX-11, MX-13 -- Kenworth & Peterbilt.
Caterpillar
C7, C9, C13 ACERT, C15 ACERT -- pre-2010 on-highway.
MaxxForce
DT, MaxxForce 7/11/13 -- International / Navistar.
Volvo / Mack
D11, D13, D16, MP7, MP8, MP10.
Hino
J05E, J08E, A05, A09 -- Toyota Group medium-duty.
Isuzu
4HK1-TC, 6HK1 -- NPR / NQR / FTR cab-over delivery.
Light & Medium-Duty Pickup Diesel
Ram, Chevy/GMC HD, Ford Super Duty diesel pickups.
Agricultural, Construction & Generators
Compact tractors, skid steers, mini excavators, and standby gensets.
John Deere PowerTech
6R, 7R, 8R, 9R tractors; S-series combines; sprayers.
Kubota
V3800, V3307, D902 -- compact tractors and skid steers.
Massey Ferguson
AGCO Power 4700/5700/6700/7700/8700 utility through high-HP cab.
Mahindra
1626, 2638, 4540, 5145, 6075 -- compact and utility tractors.
Kioti
CK, DK, NX, RX, HX series compact and utility tractors.
Bobcat
S-series skid steers, T-series CTL, E-series mini ex.
Yanmar
3TNV, 4TNV industrial; 3JH, 6LY marine; SY gensets.
Generators
Onan RV gensets, Generac home standby, Kohler, Perkins, Kubota.
Browse by System
DPF / DEF / SCR Aftertreatment
Diesel particulate filter, urea injection, NOx reduction codes.
Allison Transmission
TCM P07xx and P08xx codes for Allison 1000/2000/3000/4000.
Heavy-Duty Trucks (Class 7-8)
Big rig SPN/FMI, regen, derate, J1939 fault overview.
Aerial Lifts (Genie / JLG / Skyjack)
Scissor lifts and boom lifts used by Sunbelt, United, Herc rental fleets.
Telehandlers (Manitou / JLG / Genie / CAT)
Variable-reach forklifts for construction, agriculture, and rental yards.
Air Compressors (Atlas Copco / Sullair / Doosan)
Towable diesel compressors for pneumatic tools and jackhammers.
Light Towers (Allmand / Magnum / Wacker)
Towable jobsite and event lighting on Kubota-powered diesel.
Skid Steers (CAT / Bobcat / Deere / Kubota)
Skid steers and compact track loaders -- most-rented compact construction equipment.
Mower Engines (Kohler / Kawasaki / Briggs)
Commercial mower engines on Toro, Exmark, Scag, Bad Boy, Hustler.
Marine Diesel (Yanmar / Volvo Penta / Cummins / CAT)
Sailboat auxiliaries, cruisers, sportfishers, trawlers.