B0401 - M Collation NG

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

B0401 Possible Causes

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

First diagnose B0401 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 B0401 code

    Labor: 1.0

    The cost of diagnosing 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.

B0401 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.
OBDII Code B0401 - M Collation NG - Engine-Codes.com

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