Engine-Codes - Generic - B0402

B0402 Code - Immobilizer Key Collation NG

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

|B0402 code possible causes

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

|How is the B0402 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 B0402 code

Labor: 1.0

The cost to diagnose the B0402 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are B0402 code possible symptoms?

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

|What is B0402 code 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.

|Need more information with the B0402 code?

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|B0402 code information for specific makes

|Need help with a B0402 code?

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