Table of contents

1 OBD DTC format structure

2 UDS DTC format structure

3 Body system groupings Body system groupings

4 Chassis system groupings Chassis system group

5 Powertrain system groupings Powertrain system group

6 Network and vehicle integration groupings Network and vehicle integration group

7 end

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1 OBD DTC format structure

OBD DTC（ISO 15031）usetwo bytes, decoded according to SAE J2012-DA.

Example: A powertrain DTC of 0x0143 should display as P0143.

2 byte DTC	DTC High Byte								DTC Low Byte
DTCHex value:0x0143	0	0	0	0	0	0	0	1	0	1	0	0	0	0	1	1
display characters	No.1characters		No.2characters		No.3characters				No.4characters				No.5characters
	P		0		1				4				3

of each DTCDTC High ByteofBit7~6(high)Indication: The DTC ispower system，chassis，bodystillnetworkDTC(Refer to SAE J2012_DA for the structure of DTC);DTC High ByteofBit5~4Indication: the first number (0~3) of the DTC;DTC High ByteofBit3~0andDTC Low ByteofBit7~0Indication: 3 hexadecimal characters of the DTC.

OBD DTC 5The characters are defined as follows:

The length of the first character is 2 Bits (Bit15~14): meansThe fault belongs to the system

Bit15~14	display characters	System
00	P	Powertrain Powertrain
01	C	Chassis
10	B	Body
11	U	Network and vehicle Integration Network and Vehicle Integration

The length of the second character is 2 Bits (Bit13~12), which meansFault type

Bit13~12	display characters	type
00	0	ISO/S AE controlled
01	1	manufacturercontrolled
10	2	ISO/S AE controlled
11	3	ISO/S AE controlled

The length of the third character is 4 Bits (Bit11~8): meansvehicle system domain(Area of ​​vehicle system), parsed into 1 hexadecimal character according to 4 Bits.

The length of the 4th~5th characters is 8 Bits (Bit7~0), and they are parsed into 2 hexadecimal characters according to the 4 Bits respectively.

Note:

Alphanumeric codes are "B0", "B1", "B2", "B3", "C0", "C1", "C2", "C3", "P0", "P1", "P2", "P3" " ", "U0", "U1", "U2", and "U3" respectively correspond to four sets of body, four sets of chassis, four sets of powertrain, four sets of network and vehicle integration fault codes.

code structureitself is partially open. Parts of the available numerical sequences (parts of "B0", "C0", "P0", "P2", "P3", "U0" and "U3") are reserved for use in this or future updated Unicode assignments.

Key

1. Display character 3 is used to identify a specific vehicle area; within any area, display characters 4 and 5 allow up to 256 code definitions
2. For Powertrain, these Bits are controlled by ISO/SAE; for all others, they are Manufacturer Controlled
3. For powertrain, 11 = manufacturer control for P3000 to P33FF; 11 = ISO/SAE reserved for P3400 to P3FFF

2 UDS DTC format structure

UDS DTC（ISO 14229）usethree bytes, the two most significant bytes (DTC High ByteandDTC Middle Byte) is decoded according to the DTC Format Identifier = 0x00 or 0x04 specified by the implemented diagnostic protocol; the least significant byte (DTC Low Byte) are decoded according to the SAE J2012-DA Failure Type Byte (FTB) table.

The figure below shows an example of a 3-byte DTCFormatIdentifier = 0x00/0x04 DTC structure. A 3 byte DTC with DTCFormatIdentifier = 0x00/0x04 as data bus value 0x923411 will be displayed to the technician as manufacturer controlled body code B1234–11.

For the definition of DTC low byte (failure type byte), please refer to the SAE J2012-DA FTB table. The low byte should be displayed in hexadecimal format, for example, 0x11 should be displayed as "11". When the most significant 2 bytes of this DTC are contained within the SAE control range, it is decoded according to the DTCFormatIdentifier = 0x00/0x04 list in SAE J2012-DA.

3 Body system groupings Body system groupings

DTC numbers and descriptions are given in SAE J2012-DA. The following table defines the body system groups.

DTC range	range of hexadecimal values	describe
B0000 – B0FFF	0x8000 ~ 0x8FFF	ISO/SAE controlled
B1000 – B1FFF	0x9000 ~ 0x9FFF	manufacturer controlled
B2000 – B2FFF	0xA000 ~ 0xAFFF	manufacturer controlled
B3000 – B3FFF	0xB000 ~ 0xBFFF	reserved by document

4 Chassis system groupings Chassis system group

DTC numbers and descriptions are given in SAE J2012-DA. The following table defines the undercarriage groups.

DTC range	range of hexadecimal values	describe
C0000 – C0FFF	0x4000 ~ 0x4FFF	ISO/SAE controlled
C1000 – C1FFF	0x5000 ~ 0x5FFF	manufacturer controlled
C2000 – C2FFF	0x6000 ~ 0x6FFF	manufacturer controlled
C3000 – C3FFF	0x7000 ~ 0x7FFF	reserved by document

5 Powertrain system groupings Powertrain system group

DTC numbers and descriptions are given in SAE J2012-DA. The table below defines the powertrain groups.

DTC range	range of hexadecimal values	describe
P0000 – P0FFF	0x0000 ~ 0x0FFF	ISO/SAE controlled
P1000 – P1FFF	0x1000 ~ 0x1FFF	manufacturer controlled
P2000 – P2FFF	0x2000 ~ 0x2FFF	ISO/SAE controlled
P3000 – P33FF	0x3000 ~ 0x33FF	manufacturer controlled
P3400 – P3FFF	0x3400 ~ 0x3FFF	ISO/SAE controlled

6 Network and vehicle integration groupings Network and vehicle integration groupings

DTC numbers and descriptions are given in SAE J2012-DA. The following table defines the network and vehicle integration groups.

DTC range	range of hexadecimal values	describe
U0000 – U0FFF	0xC000 ~ 0xCFFF	ISO/SAE controlled
U1000 – U1FFF	0xD000 ~ 0xDFFF	manufacturer controlled
U2000 – U2FFF	0xE000 ~ 0xEFFF	manufacturer controlled
U3000 – U3FFF	0xF000 ~ 0xFFFF	ISO/SAE controlled

7 end

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