DTC 1173

UnclassifiedGeneral

What This Code Means

MIL-On (Malfunction Indicator Light active); Adaptive disabled

Possible Causes

  • EPR CAN communication with the ECM is lost
  • No packets received within 500 ms

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Get a diagnosis walkthrough for DTC 1173 on your specific Power Solutions International unit — cited to the OEM manual, not a forum guess.

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