B0403 SUBARU - E/G Request NG

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

Possible causes

  • Incorrect Immobilizer Key
  • Immobilizer Key Not Programmed
  • Faulty Body Integrated Unit (BIU)

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B0403 Subaru Description

The Immobilizer system performs the starter relay control. The Body Integrated Unit (BIU) detects the inconformity of reference code, immediately output the starter relay cut signal to Engine Control Module (ECM), and then ECM stops the starter relay operation. In this case, engine does not start, and DTC is not recorded in ECM. Check that the engine does not start on the DTC of body integrated unit.
OBDII Code B0403 Subaru -  E/G Request NG - Engine-Codes.com

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