Circuit/System Verification

WARNING: This page is about a different car, the 2013 Cadillac XTS. However, it is still accessible from the selected car via links, so may be relevant.

Ignition ON. Radio ON.
Verify DTC U0028 is set.
- If the DTC is set
  Refer to DTC U0028 .
- If the DTC is not set
Verify DTC U0029 is not set with symptom byte 02.
- If DTC U0029 is set with symptom byte 02
  Refer to DTC U2098 .
- If DTC U0029 is set with other symptom bytes except 02
Refer to Testing for Intermittent Conditions and Poor Connections to test for an intermittent condition.