DTC U1806
Diagnostic Instructions
DTC Descriptor
DTC U1806 00: Battery Energy Control Module High Voltage Energy Management Communication Bus Off
Circuit/System Description
The high-voltage energy management high-speed GMLAN serial data circuits are serial data buses used to communicate information between the hybrid powertrain control module 2, the battery energy control module and the battery charger. If this serial data system is inoperative the control modules will not communicate with each other on this bus, but they still communicate with the scan tool through the high-speed GMLAN bus.
The scan tool does not communicate with control modules through the high-voltage energy management high-speed GMLAN bus. The high-voltage energy high-speed GMLAN serial data circuits connect directly to the auxiliary data connector and do not connect with the scan tool.
Conditions for Running the DTC
| • | The system voltage is at least 9 V. |
Conditions for Setting the DTC
The control module setting the DTC has attempted to establish communications on the serial data circuits for more than 1.4 seconds without success.
Action Taken When the DTC Sets
The DTC U1806 is a type B DTC.
Conditions for Clearing the DTC
The DTC U1806 is a type B DTC.
Circuit/System Verification
Verify that U007A is not set.
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