B3033 on Chevrolet
Security System Indicates Tamper
B3033 on Chevrolet vehicles indicates security system indicates tamper. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 1500. 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. Typical repair costs on Chevrolet range from $10 to $350, depending on the specific model and root cause.
Common Causes of B3033
- •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
B3033 on Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- Passlock Anti-Theft Crank-No-Start ('Service Theft System' / Flashing Security Light)1999-2007
The Passlock II theft-deterrent system reads a Hall-effect sensor and magnet in the ignition lock cylinder. As the sensor or lock cylinder wears, the BCM sees an out-of-range voltage, flags a theft fault, flashes the SECURITY light, and disables fuel injection so the engine cranks but won't start. Owners get stranded with a 'Service Theft System' or security light and a no-start that often clears after a wait. Extremely common and heavily searched on these trucks.
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View B3033 across all makes →Frequently Asked Questions
What does B3033 mean on Chevrolet?▼
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. On Chevrolet specifically, this code is documented across 1 model.
What causes B3033 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B3033 on a Chevrolet?▼
Repair costs on Chevrolet range from $10 to $350, depending on the specific model and root cause.
Which Chevrolet models have B3033 documented?▼
Au7o has documented B3033 on 1 Chevrolet model: Silverado 1500.