Diagnostic Aids

2025 Chevrolet Traverse High Country, FWDSECTION Diagnostic Aids
  • It is critical to use the service replacement Communication Interface Module only in the vehicle for which it was ordered.
  • Failure to perform the following procedures will result in a red LED, DTC(s) being set, and limited or incomplete OnStar® services.
  • A test call is required to complete the procedure.
  • On vehicles up fitted with TTY capabilities, it is necessary to perform a power cycle of the OnStar® Interface Module (OTIM), and toggle the TTY mode after completing the Communication Interface Module installation and setup procedures.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • You smell fuel, burning insulation, or see smoke.
  • Brakes feel soft, pull hard to one side, or make grinding noises.
  • The engine overheats, stalls repeatedly, or misfires under load.
  • You are missing required tools, torque specs, or safe lifting equipment.
  • You are not confident in the next step or safety outcome.