B2960Anti-Theft

Security Indicator / Theft Deterrent Signal Malfunction

B2960 indicates the theft-deterrent (security) system detected an invalid signal or a mismatch, such as an incorrect password between the body module and the engine control module. It can disable starting.

🚗 Sometimes not, since theft-deterrent faults can prevent starting.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Password mismatch between modules$100-$400

40%

The BCM and ECM security passwords do not match, often after a module swap.

#2Faulty key or transponder$50-$300

30%

An unrecognized key triggers the theft-deterrent fault.

#3Wiring or communication fault$100-$500

20%

Loss of communication disrupts the security handshake.

🩺 Common Symptoms

No-start with security light on
Theft-deterrent message displayed
Fault after module or key work
Intermittent starting

💰 Repair Cost: DIY vs Shop

DIY Cost

$0-$200

Shop Cost

$150-$600

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose B2960

1Try a known-good key

2Scan both the BCM and ECM for matching security data

3Perform the security relearn procedure

4Reprogram or replace keys as indicated

❓ Frequently Asked Questions

Why won't my car start with B2960?

The security system sees a password mismatch or bad key and blocks starting.

What causes B2960?

Often a security password mismatch after a module swap, or an unrecognized key.

How do I fix B2960?

Perform the security relearn so the modules and keys share the correct password.

🔗 Related Codes

B2799B2205P0513U0155