Service Information

Volt

DTC U1807

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC U1807 00: Battery Charger Control Module High-Voltage Energy Communication Bus Off

The high-voltage energy management high-speed GMLAN serial data circuits are serial data buses used to communicate information between the control modules. The high-voltage energy high-speed GMLAN serial data circuits also connect directly to the auxiliary data connector. If this serial data system is inoperative the control modules will still communicate with the scan tool due to other serial data systems but not with each other.

Conditions for Running the DTC

•	Supply voltage to the control modules are in the normal operating range.

•	The vehicle power mode requires serial data communications.

Conditions for Setting the DTC

The control module setting the DTC has attempted to establish communication on the powertrain high-speed GMLAN serial data circuits more than 3 times.

Action Taken When the DTC Sets

DTC U1807 is a type A DTC.

Conditions for Clearing the DTC