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Test O: Scan Tool Displays Undefined DTC

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 1999 Pontiac Sunfire, 1999 Pontiac Grand Am, 1999 Oldsmobile Intrigue, 1999 Oldsmobile Cutlass, and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Turn ignition off. Install scan tool. Turn ignition on, with engine off. Using scan tool, clear DTCs. Turn ignition off. Turn ignition on, with engine off. If UNDEFINED DTC resets, go to next step. If UNDEFINED DTC does not reset, go to step  4.
  3. Replace EBCM. See ELECTRONIC BRAKE CONTROL MODULE/ ELECTRONIC BRAKE & TRACTION CONTROL MODULE (EBCM/EBTCM)  under REMOVAL & INSTALLATION. After repair, perform DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING.
  4. Malfunction is not currently present.
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