Engine Model Inspection Violation Patterns
Which FMCSR codes appear most often during roadside inspections of trucks by engine family?
Every roadside inspection generates a list of FMCSA violation codes. By grouping inspections through the engine model recorded in FMCSA VIN data, we can surface which regulatory violations cluster around specific powertrain families. This is useful for fleet managers planning preventive maintenance and for compliance officers benchmarking their engine mix against the broader industry. Each engine page shows the top 20 FMCSR codes by raw occurrence count, joined to the full violation description.
40 engine models — minimum 1,000 VINs each — 2,555,091 total VINs
| # | Engine Model | VINs |
|---|---|---|
| 1 | Detroit Diesel DD15 | 337,428 |
| 2 | D13 | 241,970 |
| 3 | ISX | 235,634 |
| 4 | MX/MX-13 | 199,411 |
| 5 | Detroit DD13 | 178,756 |
| 6 | X15, Signature | 139,150 |
| 7 | ISX / X15 | 121,958 |
| 8 | B 6.7 | 74,936 |
| 9 | Cummins B6.7 | 66,143 |
| 10 | DD15 TCO | 63,911 |
| 11 | Detroit Series 60 | 62,087 |
| 12 | Cummins ISB | 56,923 |
| 13 | Detroit Diesel DD15 EV | 47,804 |
| 14 | MP8 | 45,066 |
| 15 | 3406/C15/C16 | 45,023 |
| 16 | 3406 | 44,556 |
| 17 | ISX/ISX15/X15 | 42,552 |
| 18 | B6.7 | 41,567 |
| 19 | PX-9 | 40,365 |
| 20 | 4HK1-TC | 35,536 |
| 21 | 3306/C15/C16 | 34,653 |
| 22 | DD13 | 29,176 |
| 23 | International DT466/Maxxforce DT | 27,740 |
| 24 | L8T | 27,587 |
| 25 | A26 | 27,041 |
| 26 | Cummins ISX | 26,579 |
| 27 | MP7 | 22,698 |
| 28 | Cummins Signature 600, ISX, AHD | 21,961 |
| 29 | L9 | 21,871 |
| 30 | Cummins L9 | 21,225 |
| 31 | PX-6/PX-7 | 20,352 |
| 32 | Cummins X15 | 19,846 |
| 33 | Diesel DD13 | 19,762 |
| 34 | C12/C13 | 19,485 |
| 35 | Series 60 | 18,614 |
| 36 | Cummins ISL | 15,679 |
| 37 | J08E-VB/ J08E-WU | 15,511 |
| 38 | N14 | 15,364 |
| 39 | L5P | 15,123 |
| 40 | I1B - 4HK1TC | 14,048 |
How this data is assembled
FMCSA inspection records include a unit record for each vehicle pulled into a roadside inspection. That unit record contains the VIN. We cross-reference each VIN against the VINRecord table — populated from NHTSA vPIC decodes — to retrieve the engine model. We then count every FMCSR violation code that appeared on any inspection where a vehicle with that engine model was present.
Engine model strings come directly from NHTSA vPIC and are not normalized beyond exact match. Variants of the same physical engine may appear as separate entries (e.g., “ISX” vs “ISX / X15”). Counts represent raw co-occurrence of engine and violation in FMCSA data — not a causal link between the engine and the violation.