October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

OBDII Code Definition

OBDII DTCs are formatted with a three digit hexadecimal code preceded by an alphanumeric designator. The designator defines the system affected as well as if the code is ISO/SAE or manufacturer controlled.

Body Systems

B0xxx - ISO/SAE Controlled
B1xxx - Manufacturer Controlled
B2xxx - Manufacturer Controlled
B3xxx - Reserved

Chassis Systems

C0xxx - ISO/SAE Controlled
C1xxx - Manufacturer Controlled
C2xxx - Manufacturer Controlled
C3xxx - Reserved

Powertrain Systems

P0xxx - ISO/SAE Controlled
P1xxx - Manufacturer Controlled
P2xxx - ISO/SAE Controlled
P3xxx - Manufacturer Controlled and ISO/SAE Reserved

Network Systems

U0xxx - ISO/SAE Controlled
U1xxx - Manufacturer Controlled
U2xxx - Manufacturer Controlled
U3xxx - Manufacturer Controlled and ISO/SAE Reserved