Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition - On / Vehicle - In Service Mode
Verify there are no other DTCs set, except for DTC U3006-U3009.
- If any other DTCs are set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If only DTC U3006-U3009 is set
Verify DTC U3006-U3009 is not set.
- If any of the DTCs are set
  Refer to: Circuit/System Testing
- Go to next step: If the DTC is not set
Ignition/Vehicle & All vehicle systems - Off

NOTE:

The battery voltage should stabilize after a few minutes of turning the ignition/vehicle Off.

Test for 12.4 to 12.8 V between the test points: Battery Positive Post & Battery Negative Post
- If not between 12.4 and 12.8 V
  Refer to: Battery Inspection/Test
- Go to next step: If between 12.4 and 12.8 V
Ignition On, Propulsion Active - For greater than 15 s
Accessories - Off
Test for 13.4 to 15 V between the test points: Battery Positive Post & Battery Negative Post
- If not between 13.4 and 15 V
  Refer to: Charging System Test
- Go to next step: If between 13.4 and 15 V
Verify the scan tool parameter:
{If available} Battery Voltage @ Appropriate control module.= Within 1 V of the battery voltage

or

{If available} System Voltage @ Control Module = Within 1 V of the battery voltage
- If not within 1 V of each other
  Refer to: Circuit/System Testing
- Go to next step: If within 1 V of each other
Verify the scan tool parameter:
{If available} Ignition Voltage @ Control Module = Within 1 V of the battery voltage

or

{If available} Run/Crank Circuit Voltage @ Control Module = Within 1 V of the battery voltage
- If not within 1 V of each other
  Refer to: Circuit/System Testing
- Go to next step: If within 1 V of each other
All OK.