B3033: Security System Indicates Tamper
3 vehicles · 3 makes · $10-$800 repair
Most Reported On
B3033 is an OBD-II diagnostic trouble code meaning “Security System Indicates Tamper.” B3033 is a vehicle access/anti-theft body code generally defined as the security system indicating a tamper condition. The body or theft-deterrent control module sets this code when it detects an attempted forced entry or an invalid/unauthorized access event, such as a door or ignition input that does not match a valid key/fob authorization. It is informational regarding the security system and usually does not affect drivability, though it may indicate a real tamper attempt or a faulty input. This code is most commonly reported on 2015-2020 GMC Yukon XL, 1999-2005 Pontiac Grand Am, and 1999-2007 Chevrolet Silverado 1500, with repair costs ranging from $10 to $800.
Common Causes
Typical Repair Cost
Based on 3 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose B3033, 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 (3)
FAQ
What does B3033 mean?
B3033 stands for "Security System Indicates Tamper." B3033 is a vehicle access/anti-theft body code generally defined as the security system indicating a tamper condition. The body or theft-deterrent control module sets this code when it detects an attempted forced entry or an invalid/unauthorized access event, such as a door or ignition input that does not match a valid key/fob authorization. It is informational regarding the security system and usually does not affect drivability, though it may indicate a real tamper attempt or a faulty input.
What are the most common causes of B3033?
The most common causes of B3033 are: Forced or unauthorized entry attempt detected, Faulty door ajar / lock cylinder tamper switch, Damaged wiring or connector in a security input, Key/immobilizer authentication mismatch, Body/theft-deterrent control module fault, Aftermarket alarm or remote-start interference. The specific cause varies by vehicle.
How much does it cost to fix B3033?
Repair costs for B3033 range from $10 to $800, depending on the vehicle and root cause.
Which vehicles are affected by B3033?
Au7o has documented B3033 across 3 vehicle models from 3 manufacturers: Chevrolet, GMC, Pontiac.
Sources (10)
- NHTSANHTSA Vehicle Complaints for 2015 GMC Yukon XL
- videoYouTube - Diagnosing and Fixing Steering Column Lock Actuator Noise on GMC Yukon XL
- article2003 Pontiac Grand Am Passlock Problem, Won't Start And Security Light Is Blinking: 25 Complaints
- ForumSecurity light on Pontiac Grand Am — Car Talk Community (2004 Grand Am, Passlock ignition switch failure)
- ForumPontiac Grand Am Security Passlock Problems — Edmunds Car Forums (23+ pages)
- articleNo Start Due to Failed Passlock Sensor: Pontiac Grand Am Electrical System — RepairPal
- NHTSANHTSA complaints, 2002 Pontiac Grand Am — multiple ODI records for Passlock/security-light no-start (10898347, 10622496, 10503032, 10726457)
- articleGM Passlock Security Light Issues - RepairPal
- ForumTruck won't start - PassLock Security issues - GM-Trucks.com
- articleGM Theft Code B2960 - Key Code Incorrect but Valid - Dewitz Diagnostic
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.