Pinpoint Test G: DTC U0300:00

High-Voltage Converter/Inverter

Pinpoint Test G: DTC U0300:00

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. [1][2]Diagrams By Number

Normal Operation

The DC to DC Converter Control Module (DC/DC) communicates with various modules over the High Speed Controller Area Network (HS-CAN). If the DC/DC (DC to DC Converter Control Module) determines a software incompatibility fault is present, it sets DTC U0300:00 and operates in off-line mode (low-voltage set point and current limits at default settings). Periodic or constant heavy electrical loads of the 12-volt system may cause the 12-volt battery to become drained. Reduced functionality of 12-volt systems (headlamps, HVAC blower motor, etc.) may also be noticed.

- DTC U0300:00 (Internal Control Module Software Incompatibility: No Sub Type Information)- Sets due to a HS-CAN (High Speed Controller Area Network) configuration error.

This pinpoint test is intended to diagnose the following:

- HS-CAN (High Speed Controller Area Network) fault

- DC/DC (DC to DC Converter Control Module)

PINPOINT TEST G : DTC U0300:00

G1 CARRY OUT NETWORK TEST

- Ignition ON.

- Connect the scan tool.

- Enter the following diagnostic mode on the scan tool: Network Test.

Were any concerns identified by the Network Test?

Yes
REFER to Information Bus to diagnose the network concern.

No
GO to G2.

G2 CLEAR DTCs AND CARRY OUT SELF-TEST OF THE DC/DC (DC to DC Converter Control Module)

- Using the scan tool, clear the DC/DC (DC to DC Converter Control Module) DTCs.

- Enter the following diagnostic mode on the scan tool: Self Test- DC/DC (DC to DC Converter Control Module).

Is DTC U0300:00 reported?

Yes
INSTALL a new DC/DC (DC to DC Converter Control Module). REFER to Direct Current/Direct Current (DC/DC) Converter . CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.

No
Concern is not present at this time. CLEAR the DTC. REPEAT the self-test. TEST the system for normal operation.