U357B on 2023-2024 Cadillac Lyriq — Manufacturer-specific network code (definition unverified)
1 vehicles · 1 makes
Most Reported On
U357B is an OBD-II diagnostic trouble code meaning “Manufacturer-specific network code (definition unverified).” This code appears in real manufacturer service material - it shows up in a General Motors technical service bulletin hosted by NHTSA alongside other U-series codes - but a verified definition could not be established from a reliable source. U-range codes generally indicate a network or module communication fault rather than a mechanical failure. Because the exact meaning is manufacturer-specific, it must be read with a scan tool that supports the vehicle's make, or looked up in the manufacturer's own service information. This code is most commonly reported on 2023-2024 Cadillac Lyriq.
Common Causes
Diagnostic Tools
U357B 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 U357B mean?
U357B stands for "Manufacturer-specific network code (definition unverified)." This code appears in real manufacturer service material - it shows up in a General Motors technical service bulletin hosted by NHTSA alongside other U-series codes - but a verified definition could not be established from a reliable source. U-range codes generally indicate a network or module communication fault rather than a mechanical failure. Because the exact meaning is manufacturer-specific, it must be read with a scan tool that supports the vehicle's make, or looked up in the manufacturer's own service information.
What are the most common causes of U357B?
The most common causes of U357B are: Definition not verified - causes cannot be responsibly listed, Requires manufacturer-specific service information or a dealer-level scan tool. The specific cause varies by vehicle.
How much does it cost to fix U357B?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by U357B?
Au7o has documented U357B across 1 vehicle models from 1 manufacturers: Cadillac.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.