Diagnostic Aids

The IPC will store the code as current only as long as the failure exists. An intermittent failure will be stored as a history DTC B3564 or B2838.
If DTC B3564 or B2838 is set only in history, press and release the DIC mode (B3564) or reset (B2838) switch several times in order to verify the customer concern.

Fig 1: DTC B2838, B3564, B3569 Or B3752 Diagnosis
Courtesy of GENERAL MOTORS CORP.