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DTC P0605 - Internal Control Module ROM Error

  1. Turn ignition on, with engine off. If MIL illuminates, go to next step. If MIL does not illuminate, go to step 4).
  2. Turn engine off. Install scan tool. Start engine and check if DTC P0605 is present. If DTC is present, go to next step. If DTC is not present, problem is intermittent. See INTERMITTENTS in TESTS W/O CODES article. Also check ECM ground connection. Check continuity between ground and ECM terminals No. 6, 28, 34 and 55.
  3. Replace ECM with a known-good unit. Clear DTC. See CLEARING CODES under Self Diagnostic System section. Retest system. If DTC resets, replace ECM.
  4. Check circuit between MIL and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If circuit is okay, go to next step.
  5. Check ECM fuse. Replace as necessary. If fuse is okay, check MIL bulb. Replace as necessary. If bulb is okay, replace ECM with a known-good unit. Clear DTC. See CLEARING CODES under Self Diagnostic System section. Retest system. If DTC resets, replace ECM.
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