B0402 Possible Causes
- Incorrect Immobilizer Key
- Immobilizer Key Not Programmed
- Faulty Body Integrated Unit (BIU)
First diagnose B0402 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 connector's pins.
Cost of diagnosing the B0402 code
Labor: 1.0The cost of diagnosing the B0402 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
B0402 Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B0402 DescriptionThe 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.
B0402 More InformationNeed more information on how to fix the B0402 code?
Get Access to Factory Service Manuals
B0402 Information for specific makes
- B0402 SUBARU Immobilizer Key Collation NG
Need more help?Get the B0402 code diagnosed by a professional: Find a repair shop in your area
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