B2960: Key/Immobilizer Communication Error
5 vehicles · 1 makes · $50-$800 repair
Most Reported On
B2960 is an OBD-II diagnostic trouble code meaning “Key/Immobilizer Communication Error.” B2960 is a body/security code indicating a key or immobilizer (anti-theft) communication error, where the security module read sensor or key data that appears valid in form but does not match the expected, previously learned value. On many vehicles this involves a Passlock or transponder/immobilizer check that must pass before the computer allows the engine to start. When it fails, you typically get a security/anti-theft warning light and a no-start or no-crank condition. This is a manufacturer-specific code tied to the theft-deterrent system rather than an engine mechanical fault. This code is most commonly reported on 2000-2005 Chevrolet Cavalier, 2000-2005 Chevrolet Impala, and 2000-2005 Chevrolet Malibu, plus 2 other vehicles, with repair costs ranging from $50 to $800.
Common Causes
Typical Repair Cost
Based on 5 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose B2960, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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Vehicles Affected (5)
Passlock Anti-Theft System Prevents Starting
Passlock Security System No-Start Condition
Passlock Anti-Theft System Causing No-Start and Intermittent Stalling
Passlock Ignition Switch Failure Causing No-Start and Security Light
Passlock Anti-Theft System No-Start (Security Light)
FAQ
What does B2960 mean?
B2960 stands for "Key/Immobilizer Communication Error." B2960 is a body/security code indicating a key or immobilizer (anti-theft) communication error, where the security module read sensor or key data that appears valid in form but does not match the expected, previously learned value. On many vehicles this involves a Passlock or transponder/immobilizer check that must pass before the computer allows the engine to start. When it fails, you typically get a security/anti-theft warning light and a no-start or no-crank condition. This is a manufacturer-specific code tied to the theft-deterrent system rather than an engine mechanical fault.
What are the most common causes of B2960?
The most common causes of B2960 are: Faulty Passlock/ignition lock cylinder sensor, Damaged or worn transponder key or key chip, Wiring or connector fault in the security sensor circuit, Body control module (BCM) failure or needs relearn, Incomplete or lost immobilizer/key relearn procedure, Worn ignition lock cylinder, Aftermarket alarm or remote-start interference. The specific cause varies by vehicle.
How much does it cost to fix B2960?
Repair costs for B2960 range from $50 to $800, depending on the vehicle and root cause.
Which vehicles are affected by B2960?
Au7o has documented B2960 across 5 vehicle models from 1 manufacturers: Chevrolet.
Sources (7)
- NHTSANHTSA Vehicle Page for 2000 Chevrolet Cavalier - Includes Complaints and Investigations
- videoYouTube Repair Video: How to Fix Passlock Sensor on 2000-2005 Chevy Cavalier - ChrisFix
- ForumReddit r/MechanicAdvice thread discussing 2003 Chevy Impala Passlock No-Start Condition
- NHTSANHTSA complaints for Chevrolet Colorado reporting security light and intermittent no-start
- ForumHow To: Reset the Security System / Relearn a Key - Chevy HHR Network
- articleGM Passlock Security Light Issues - RepairPal
- articleChevy HHR Service Theft Deterrent System: Causes + Reset - Drivetrain Resource
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.