Diesel Engine Hubs
Pick an engine family to jump straight to its fault codes, common failure patterns, and diagnostic tooling. Heavy-duty Class 8, pickup diesel, agricultural and construction equipment, and standby gensets are all here.
2,122 fault codes documented · 15 engine families
Heavy-Duty Truck Engines
Class 7-8 on-highway. J1939 SPN/FMI + manufacturer-proprietary fault codes.
Cummins ISX / X15 / 6.7L
272 codesISX, X15, ISB 6.7L, ISL, ISC, ISM. Big bore on-highway and medium-duty. Most common Class 8 engine in North America.
Detroit Diesel DD13 / DD15 / DD16
106 codesDaimler Trucks NA. Powers Freightliner Cascadia and Western Star. J1939 SPN/FMI + ACM codes.
PACCAR MX-11 / MX-13
186 codesPACCAR in-house big bore in Kenworth and Peterbilt trucks. ECM, aftertreatment, EGR, turbo faults.
Caterpillar C7 / C9 / C13 / C15
152 codesPre-2010 CAT on-highway diesel. C15 ACERT, C13 ACERT notorious for EGR cooler failures.
MaxxForce DT / 7 / 11 / 13
83 codesInternational / Navistar engines. DT medium-duty workhorse, 11/13 EPA10 strategy that triggered massive recalls.
Volvo D11/D13/D16 + Mack MP7/MP8/MP10
116 codesVolvo Group shared architecture (Volvo & Mack). EGR cooler, DEF dosing, NOx faults via Volvo Tech Tool / PTT.
Hino J05E / J08E / A05 / A09
70 codesToyota Group medium-duty. 195, 268, 268A, 338, 358, M5, L6, L7, XL7, XL8.
Isuzu 4HK1-TC / 6HK1
88 codesNPR / NPR-HD / NPR-XD / NQR / FTR / FVR / FRR cab-over delivery trucks.
Pickup Diesel
Ram, Chevy/GMC HD, and Ford Super Duty diesel pickups.
Agricultural, Construction & Generators
Compact tractors, skid steers, mini excavators, marine, and standby / portable gensets.
John Deere PowerTech
174 codes6R, 7R, 8R, 9R tractors; S-series combines; R4045/R4060 sprayers. PSS, PVS, E platforms.
Kubota
137 codesV3800, V3307, V2607, V2403 common-rail; D902, D1105 indirect-injection. Compact tractors and skid steers.
Bobcat (Kubota / Doosan)
61 codesS-series skid steer loaders, T-series compact track loaders, E-series mini excavators. Kubota V3800 or Doosan D24/D34.
Yanmar
56 codes3TNV/4TNV industrial; 3JH/4JH/6LY marine; SY-series gensets. Powers many JD, Takeuchi, Cub Cadet rebadged machines.
Massey Ferguson
16 codesAGCO Power 4700/5700/6700/7700/8700 utility through high-HP cab tractors. SCR + DEF aftertreatment; AGCO EDT diagnostics.
Mahindra
16 codes1626, 2638, 4540, 5145, 6075, 8090. Largest tractor brand by volume globally; mCRD common-rail Tier 4 Final engines.
Kioti
16 codesCK, DK, NX, RX, HX series. Daedong common-rail Tier 4 Final engines popular with hobby farmers and landscapers.
Generators (Onan / Generac / Kohler / Perkins / Kubota)
112 codesStandby and portable generator brands. RV gensets, home standby, industrial prime power.