B2477

Anti-Theft Ignition Disable Circuit

Severity: High Body Control Generic OBD-II Code Est. Repair: $0 - $300 (key battery/reprogram) up to $500+ (module)

High severity. Avoid long drives and get diagnosed as soon as possible. Flashing check engine light = stop driving if safe.

Quick Answer

B2477 means “Anti-Theft Ignition Disable Circuit.” Severity: High. Estimated repair cost: $0 - $300 (key battery/reprogram) up to $500+ (module). Most common sign: No-start with security/theft light flashing.

What Does B2477 Mean?

Immobilizer/anti-theft system is not allowing the ignition/starter circuit to enable.

Common Symptoms

No-start with security/theft light flashing

Possible Causes

Key/fob not recognized
Faulty immobilizer antenna ring around ignition
Low key battery
Faulty BCM/immobilizer module

How to Fix B2477 – Repair Guide

Try a spare key first
Replace key fob battery
Inspect antenna ring around ignition cylinder
Have dealer/locksmith reprogram keys if needed
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Budgeting for This Repair?

A typical B2477 repair runs about $0 - $300 (key battery/reprogram) up to $500+ (module). If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.