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The ECM generally works or doesn't.

But signs you have one going are hard to diagnose. But some I have seen:

  • Values that are set by the software and change small amounts constantly freeze
  • Loss of signal from a sensor but the sensor and wiring check out
  • Intermitant limpin or shut down with out code set or check engine light

The problem with this list is that every symptom is more likely caused by an external source.

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15y ago

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