TruckCodex

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 — 2,209,023 total VINs

# Engine Model VINs
1 Detroit Diesel DD15 316,000
2 D13 213,616
3 ISX 208,912
4 MX/MX-13 176,258
5 Detroit DD13 159,624
6 X15, Signature 122,839
7 ISX / X15 108,154
8 B 6.7 62,332
9 Cummins B6.7 60,767
10 Detroit Series 60 53,291
11 DD15 TCO 48,459
12 Cummins ISB 44,701
13 Detroit Diesel DD15 EV 40,960
14 MP8 39,899
15 3406/C15/C16 38,526
16 3406 37,796
17 ISX/ISX15/X15 34,604
18 PX-9 33,963
19 3306/C15/C16 29,844
20 4HK1-TC 29,367
21 B6.7 25,495
22 A26 23,673
23 Cummins ISX 22,825
24 L8T 20,909
25 International DT466/Maxxforce DT 20,848
26 Cummins L9 19,909
27 DD13 18,810
28 Cummins Signature 600, ISX, AHD 18,238
29 MP7 18,177
30 Cummins X15 17,932
31 PX-6/PX-7 16,323
32 Diesel DD13 16,320
33 C12/C13 16,305
34 Series 60 15,762
35 L9 15,035
36 J08E-VB/ J08E-WU 13,236
37 N14 13,108
38 Cummins ISL 12,868
39 I1B - 4HK1TC 11,798
40 MX-11 11,540

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.

Related

VIN Lookup
Decode any 17-character VIN
Violation Codes
Full FMCSR violation code reference
Inspections
Browse roadside inspection records
Makes & Models
Browse commercial vehicle manufacturers

Data sources & freshness

TruckCodex aggregates official public-sector datasets. See the Source registry for dataset-level coverage and the Freshness log for last-import timestamps.

FMCSA

Census, SAFER, SMS, Licensing & Insurance (L&I), roadside inspections, crashes, and authority history.

Refreshed daily.
NHTSA

Vehicle recall campaigns, defect investigations, and consumer safety complaints (SCRS).

Refreshed daily.
EIA

Retail diesel and gasoline price history and state fuel-tax tables.

Refreshed weekly.
Transport Canada

Cross-border carrier registry and Canadian recall campaigns where applicable.

Refreshed weekly.

TruckCodex is an independent aggregator; it is not affiliated with FMCSA, NHTSA, EIA, or Transport Canada. Always verify compliance-critical information directly with the originating agency.