B0403 Possible Causes
- Incorrect Immobilizer Key
- Immobilizer Key Not Programmed
- Faulty Body Integrated Unit (BIU)
First diagnose B0403 code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
Cost of diagnosing the B0403 code
Labor: 1.0The cost of diagnosing the B0403 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
B0403 Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B0403 MeaningThe 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.
B0403 More InformationNeed more information on how to fix the B0403 code?
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B0403 Information for specific makes
- B0403 SUBARU E/G Request NG