U0423: owner reports and bulletins

Network / communication. We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got U0423 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

6 complaints filed with NHTSA mention U0423, 6 of them since 2015, across 6 different models. The component owners most often filed it under: electrical system.

Manufacturer service bulletins that name U0423

11 technical service bulletins and manufacturer communications filed with NHTSA mention U0423, from 6 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • ALFA ROMEO TONALE (2023, 2024), bulletin 10243158: Body Control Module (BCM) Sets Diagnostic Trouble Code (DTC) U0423-87 Invalid Data Received from TBM (Telematic Box Module) - Missing Message Erroneously
  • DODGE HORNET (2023, 2024), bulletin 10243158: Body Control Module (BCM) Sets Diagnostic Trouble Code (DTC) U0423-87 Invalid Data Received from TBM (Telematic Box Module) - Missing Message Erroneously
  • MAZDA UNKNOWN, bulletin 10076900: MULTI-MODEL (EQUIPPED WITH MAZDA CONNECT). SOME VEHICLES (WITH MAZDA CONNECT) MAY EXHIBIT A CONDITION WHERE DTC U0323 (PCM)/U0423(ABS)/U3000(IC) CANNOT BE DELETED WHEN THE TPMS WARNING LIGHT FLASHES AND/OR THE TCS/DSC IN…
  • MAZDA MAZDA3 (2014, 2015, 2016, 2017), bulletin 10152371: Some vehicles (with MAZDA CONNECT) may exhibit a condition where DTC U0323(PCM) / U0423(ABS) /U3000(IC) CANNOT be deleted when the TPMS warning light flashes and/or the TCS/DSC indicator lights are illuminated. This can …
  • MAZDA CX-3 (2016, 2017, 2018, 2019), bulletin 10153300: Some vehicles (with MAZDA CONNECT) may exhibit a condition where DTC U0323(PCM) / U0423(ABS) /U3000(IC) CANNOT be deleted when the TPMS warning light flashes and/or the TCS/DSC indicator lights are illuminated. This can …
  • TOYOTA YARIS (2018), bulletin 10132467: TSB: Some 2017 model year iA vehicles may exhibit Diagnostic Trouble Codes (DTCs) U0323 (PCM Software Incompatibility with Instrument Panel Control Module), U0423 (ABS Invalid Data Received from Instrument Panel Cluster …

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.