B0401 Possible Causes
- Incorrect Immobilizer Key
- Immobilizer Key Not Programmed
- Faulty Body Integrated Unit (BIU)
How is the B0401 code repair?
Start by checking 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.What is the cost to diagnose the B0401 code
Labor: 1.0
The cost to diagnose the B0401 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.
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Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B0401 Meaning
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.More Information
Need more information on how to fix the B0401 code?Get Access to Factory Service Manuals
Information for specific makes
- B0401 SUBARU M Collation NG