About OBD2

[ P0000-0100 ] [ P0100-0200 ] [ P0200-0300 ] [ P0300-0400 ] [ P0400-0500 ] [ P0500-0600 ] [ P0600-0700 ] [ P0700-0800 ] [ P0800- ]
[ P1000-1100 ] [ P1100-1200 ] [ P1200-1300 ] [ P1300-1400 ] [ P1400-1500 ] [ P1500-1600 ] [ P1600-1700 ] [ P1700-1800 ] [ P1800- ]
[ P2000-2100 ] [ P2100-2200 ] [ P2200-2300 ] [ P2300-2400 ] [ P2400-2500 ] [ P2500-2600 ] [ P2600-2700 ] [ P2700-2800 ] [ P2800- ]
[ P3000-3100 ] [ P3100-3200 ] [ P3200-3300 ] [ P3300-3400 ] [ P3400-3500 ] [ P3500- ]

[ U0000-0100 ] [ U0100-0200 ] [ U0200-0300 ] [ U0300-0400 ] [ U0400-1000 ] [ U1000-2000 ] [ U2000-3000 ] [ U3000-4000 ]
[ B0000-1000 ] [ B1000-2000 ] [ B2000-3000 ] [ B3000-4000 ]
[ C0000-1000 ] [ C1000-2000 ] [ C2000-3000 ] [ C3000-4000 ]
Warning: Please check for manufacturer specific codes with an appropriate manual. See the Scanner & Programs page for diagnostic options.  

Configuration of 16 pin data link connector (OLC)

• Some 1995 GM vehicles have the 16-pin connector but have accessible OBD-I codes. Check the underhood emissions sticker to confirm, and if yours is OBD-I, the codes are accessed by bridging terminals 5 and 6. If your vehicle is OBD-II, a scan tool or computer is required to access the codes.

TERMINAL	DESIGNATION
Pin 1	Manufacturer specific
Pin 2	SAE J1850 bus +ve
Pin 3	Manufacturer specific
Pin 4	Chassis ground
Pin 5	Signal ground
Pin 6	CAN data bus, high – ISO 15765-4
Pin 7	K-line – ISO 9141-2/ISO 14230-4
Pin 8	Manufacturer specific
Pin 9	Manufacturer specific
Pin 10	SAE J1850 bus -ve
Pin 11	Manufacturer specific
Pin 12	Manufacturer specific
Pin 13	Manufacturer specific
Pin 14	CAN data bus, low – ISO 15765-4
Pin 15	L-line – ISO 9141-2/ISO 14230-4
Pin 16	Battery positive

   

Note: OBD II oxygen sensor designation For “V” engines; BANK 1 is always on the side of the engine with the number 1 cylinder (odd cylinders), and BANK 2 is always on the side of the engine where the number 2 cylinder (even cylinders) is located.

OBD-II trouble code format

• 5 character alpha-numeric trouble codes are made up as follows:

Letter Prefix	First Digit	Second Digit	Third Digit	Fourth Digit
P	0	1	0	8
1	2	3	4	5

Letter prefix defines system group

B	Body
C	Chassis
P	Powertrain
U	Network communications

First digit defines code type

• Body/chassis

0	SAE defined (OBD-11)
1	Manufacturer defined
2	Manufacturer defined
3	For future allocation

• Powertrain

0	SAE defined (OBD-11)
1	Manufacturer defined
2	SAE defined (OBD-11)
3	P3000-P3399 – Manufacturer defined P3400-P3999- SAE defined (OBD-II)

• Network communications

0	SAE defined (OBD-11)
1	Manufacturer defined
2	Manufacturer defined
3	SAE defined (OBD-11)

Second digit/letter defines system area

• Powertrain – P0/P1 code

0	Fuel, air or emission control
1	Fuel or air
2	Fuel or air
3	Ignition system or misfire
4	Emission control
5	Vehicle speed, idle speed control or auxillary inputs
6	Computer or auxillary outputs
7	Transmission
8	Transmission
9	Transmission
A	Hybrid propulsion
B	Hybrid propulsion
C	Hybrid propulsion
D	For future allocation
E	For future allocation
F	For future allocation

• Powertrain – P2 code

0	Fuel, air or emission control
1	Fuel, air or emission control
2	Fuel, air or emission control
3	Ignition system or misfire
4	Emission control
5	Auxillary input
6	Computer and auxillary outputs
7	Transmission
8	For future allocation
A	Fuel, air or emission control
B	Fuel, air or emission control
c	For future allocation
D	For future allocation
E	For future allocation
F	For future allocation

• Powertrain – P3 code

0	Fuel, air or emission control
1	Fuel, air or emission control
2	Fuel, air or emission control
3	Ignition system or misfire
4	Cylinder deactivation
5	For future allocation
6	For future allocation
7	For future allocation
8	For future allocation
9	For future allocation
A	For future allocation
B	For future allocation
c	For future allocation
D	For future allocation
E	For future allocation
F	For future allocation

• Network communications

0	Network electrical
1	Network communications
2	Network communications
3	Network software
4	Network data
5	For future allocation
6	For future allocation
7	For future allocation
8 .	For future allocation
9	For future allocation
A	For future allocation
B	For future allocation
c	For future allocation
D	For future allocation
E	For future allocation
F	For future allocation

Third and fourth digits define specific fault

• These digits define general malfunction, range or performance of component or system, low or high input.

NOTE: Emissions related problems have an ISO defined list of codes and definitions starting with P0001.

Example code P0108

• This code is logged when a high input is detected in the circuit of the manifold absolute pressure (MAP) sensor or barometric pressure (BARO) sensor.
• P – System – Powertrain
• 0- Code type – OBD-II
• 1 – System identification (fuel and air)
• 08 – MAP/BARO sensor – circuit, high input

NOTE: The trouble code is hexadecimal and therefore the third, fourth and fifth characters can be either a number (0-9), or a letter (A-F).

• Unlike the decimal system that uses a base of 10, the hexadecimal system uses a base of 16. Using the characters 0-9 and A to F the number can be from 0-15.

Character	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
Value	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15

• By using the hexadecimal system 2 characters can equate to a maximum number of 255, in the decimal system the maximum number with 2 characters is 99.
• For example:

Hex	Decimal equation	Decimal
C8	(12 X 16) + (8 X 1)	200
FF	(15x 16)+ (15x 1)	255
100	(1 X 16 X 16) + (0 X 16) + (0 X 1)	256