OBD standards this vehicle conforms to

Last reviewed 2026-08-31

Mode 01 · PID 1C (decimal 28)

Description

Which OBD regulation this ECU claims: CARB OBD-II, EPA OBD, EOBD, JOBD, WWH-OBD, and combinations. Value 6 is EOBD; 21 is WWH-OBD.

Value	Meaning
1	CARB OBD-II OBD-II as defined by the California Air Resources Board.
2	EPA OBD OBD as defined by the US EPA.
3	OBD and OBD-II Supports both EPA OBD and OBD-II.
4	OBD-I Legacy OBD-I.
5	Not OBD compliant ECU reports it is not OBD compliant.
6	EOBD European On-Board Diagnostics.
7	EOBD and OBD-II EOBD plus OBD-II.
8	EOBD and OBD EOBD plus EPA OBD.
9	EOBD, OBD and OBD-II All three layers.
10	JOBD Japanese OBD.
11	JOBD and OBD-II JOBD plus OBD-II.
12	JOBD and EOBD JOBD plus EOBD.
13	JOBD, EOBD and OBD-II JOBD, EOBD and OBD-II.
14	OBD, EOBD and KOBD OBD, EOBD and Korean OBD.
15	OBD, OBD-II, EOBD and KOBD Combined OBD family declaration.
17	EMD Engine Manufacturer Diagnostics.
18	EMD+ Engine Manufacturer Diagnostics Enhanced.
19	HD OBD-C Heavy-duty OBD child / partial.
20	HD OBD Heavy-duty On-Board Diagnostics.
21	WWH-OBD World-Wide Harmonized OBD.
23	HD EOBD-I Heavy-duty Euro OBD Stage I without NOx control.
24	HD EOBD-I N Heavy-duty Euro OBD Stage I with NOx control.
25	HD EOBD-II Heavy-duty Euro OBD Stage II without NOx control.
26	HD EOBD-II N Heavy-duty Euro OBD Stage II with NOx control.
27	Heavy-duty ZEV Zero-emission heavy-duty category.
28	OBDBr-1 Brazil OBD Phase 1.
29	OBDBr-2 Brazil OBD Phase 2.
30	KOBD Korean OBD.
31	IOBD I India OBD I.
32	IOBD II India OBD II.
33	HD EOBD-IV Heavy-duty Euro OBD Stage VI.
34	OBD, OBD-II and HD OBD Combined light- and heavy-duty declaration.
35	OBDBr-3 Brazil OBD Phase 3.

Also valid as Mode 02 freeze-frame data (same PID number, snapshot at last DTC).
Bit-encoded or enumerated — not a single scaled physical value.

Defined by SAE J1979 / ISO 15031-5. Public index — not a substitute for the paid SAE document.

Provenance for this page. Official standards outrank community notes. See the confidence policy.

Official standard · high trust
SAE J1979 / ISO 15031-5 Mode 01 PID formulas (public index)
J1979 public PID index: 01 1C