DTC Display Order

In the diagnostic mode, diagnostic trouble codes (DTCs) are displayed in the following order:
1. DTC 12
This indicates that the BCM is in diagnostic mode.
2. Any current DTCs (DTC 21- DTC 25) then any history DTCs (DTC 31- DTC 35) These are displayed in numerical order.
3. The remote control door lock transmitter diagnostic DTCs (DTC 41- DTC 45)
These DTCs will display if the keyless entry transmitter buttons are pressed while in the diagnostic mode.
4. The begin configuration display (DTC 55) DTC 55 and 2 single digit configuration numbers are always displayed. The first digit following DTC 55 is the hardware configuration. The second digit is the software configuration.
5. After the configuration numbers are displayed, the entire list is repeated beginning with DTC 12.

If only DTC 12, DTC 55 and the configuration digits are displayed when the BCM is in the diagnostic mode, the BCM has no circuit failure DTCs set and is operating properly.

If DTCs are not displayed, or if the BCM cannot enter the diagnostic mode, refer to Cannot Enter BCM Diagnostics.

If any other DTCs are displayed, refer to Diagnostic System Check - Body Control Module. Initial Inspection and Diagnostic Overview