B1000 on Chevrolet
ECU/Control Module Internal Malfunction (manufacturer-specific)
B1000 on Chevrolet vehicles indicates ecu/control module internal malfunction (manufacturer-specific). Au7o has documented this code across 1 Chevrolet model — most commonly on Impala. B1000 is a manufacturer-specific body (B) code that generally indicates a control module has detected an internal failure during a self-test. The exact module varies by maker: on Toyota/Lexus it typically points to a fault in the airbag (SRS) control computer, while on GM and some others it is a more general ECU malfunction flag set by the body control or airbag module. When tied to the airbag system it is safety-critical because it can disable airbag deployment. The specific module and meaning should be confirmed with the vehicle's service data.
Common Causes of B1000
- •Internal fault in the airbag (SRS) control module
- •Faulty body control module (BCM) or other networked module
- •Internal memory/processor self-test failure
- •Power supply or ground problem to the module
- •Water intrusion or corrosion damage to the module
- •Module software corruption
- •Previously deployed or damaged airbag system component
B1000 on Chevrolet by Model
Chevrolet Impala(1 issue)
- Ignition Switch Failure and Recall (NHTSA 14V-394)2003-2006
The 2003-2006 Impala was included in the massive GM ignition switch recall affecting millions of vehicles. The ignition switch has a weak detent spring that allows the key to slip from the "Run" position to the "Accessory" or "Off" position while driving. When this happens, the engine shuts off, the power steering and brake boost are lost, and the airbags are disabled — all without warning. The issue is exacerbated by heavy key chains that add weight and leverage on the ignition cylinder. This defect was linked to numerous fatalities.
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View B1000 across all makes →Frequently Asked Questions
What does B1000 mean on Chevrolet?▼
B1000 stands for "ECU/Control Module Internal Malfunction (manufacturer-specific)." B1000 is a manufacturer-specific body (B) code that generally indicates a control module has detected an internal failure during a self-test. The exact module varies by maker: on Toyota/Lexus it typically points to a fault in the airbag (SRS) control computer, while on GM and some others it is a more general ECU malfunction flag set by the body control or airbag module. When tied to the airbag system it is safety-critical because it can disable airbag deployment. The specific module and meaning should be confirmed with the vehicle's service data. On Chevrolet specifically, this code is documented across 1 model.
What causes B1000 on Chevrolet vehicles?▼
Common causes on Chevrolet: Internal fault in the airbag (SRS) control module, Faulty body control module (BCM) or other networked module, Internal memory/processor self-test failure, Power supply or ground problem to the module, Water intrusion or corrosion damage to the module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1000 on a Chevrolet?▼
Repair costs vary widely depending on the root cause and specific Chevrolet model.
Which Chevrolet models have B1000 documented?▼
Au7o has documented B1000 on 1 Chevrolet model: Impala.