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DTC P0605/16989 - ECM Read Only Memory (ROM) Error

NOTE: DTC is set when Electronic Control Module (ECM) recognizes internal failures.
  1. Inspect ECM connector for looseness and/or corrosion. Repair ECM connector as necessary. Erase DTCs and perform test drive. See CLEARING DTCS in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step. If ECM connector is okay, go to next step.
  2. Start and run engine for about 3 minutes. Turn ignition off and on. Erase DTC memory and test drive vehicle. See CLEARING DTCS  in this article. Recheck DTC memory and verify DTC does not reset. If DTC resets, go to next step.
  3. Replace faulty ECM. Test drive vehicle. Recheck DTC memory and verify DTC does not reset. If DTC resets, repeat testing procedure.
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