U1807

DTC U1807

Diagnostic Instructions

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

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

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

DTC Descriptor

DTC U1807
- Battery Charger Control Module High Voltage Energy Management CAN Bus Off

For symptom byte information, refer to Symptom Byte List Symptom Byte List.

Circuit/System Description

The high voltage energy management high speed GMLAN serial data circuits are serial data buses used to communicate information between the devices. The high voltage energy management high speed GMLAN serial data circuits also connect directly to the auxiliary data connector. If this serial data system is inoperative the devices 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 devices are in the normal operating range.

* The vehicle power mode requires serial data communications.

Conditions for Setting the DTC

The device setting the DTC has attempted to establish communications on the high voltage energy management 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

DTC U1807 is a type A DTC.

Circuit/System Verification

1. Vehicle in Service Mode.

2. Verify DTC U1807 is not set.

• If DTC U1807 is set
Refer to DTC U007A U007A.

• If DTC U1807 is not set

3. All OK