DTC 302 4

UnclassifiedGeneral

What This Code Means

MIL: ON for active fault; Adaptive: Disabled

Possible Causes

  • Poor harness connections
  • Faulty sensor
  • Internal fault message communicated to ECM over CAN

Suggested Actions

  1. 1Check harness (post-control box harness, sensor side) for poor connections
  2. 2Replace sensor with known good unit and re-test
  3. 3Run the Closed-Loop test from the Tests page in EDIS

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for DTC 302 4 on your specific Power Solutions International unit — cited to the OEM manual, not a forum guess.

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