B1000: ECU/Control Module Internal Malfunction (manufacturer-specific)
2 vehicles · 2 makes
Most Reported On
B1000 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2015-2022 Ford Transit, and 2003-2006 Chevrolet Impala.
Common Causes
Diagnostic Tools
B1000 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does B1000 mean?
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.
What are the most common causes of B1000?
The most common causes of B1000 are: 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. The specific cause varies by vehicle.
How much does it cost to fix B1000?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by B1000?
Au7o has documented B1000 across 2 vehicle models from 2 manufacturers: Chevrolet, Ford.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.