U1346: 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 U1346 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

No consumer complaints filed with NHTSA mention U1346. That usually means it's rare, or owners don't quote the code when they file.

Manufacturer service bulletins that name U1346

8 technical service bulletins and manufacturer communications filed with NHTSA mention U1346, from 3 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CADILLAC ESCALADE ESV (2023, 2024), bulletin 11007999: This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with Active DTC P0102 and Possibly U060F and U1346 at the Mass Air Flow Sensor.
  • GMC YUKON (2023, 2024), bulletin 11007999: This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with Active DTC P0102 and Possibly U060F and U1346 at the Mass Air Flow Sensor.
  • CHEVROLET SUBURBAN 1500 (2023, 2024), bulletin 11007999: This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with Active DTC P0102 and Possibly U060F and U1346 at the Mass Air Flow Sensor.
  • CHEVROLET SUBURBAN (2024, 2023), bulletin 11008941: This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with Active DTC P0102 and Possibly U060F and U1346 at the Mass Air Flow Sensor.
  • CADILLAC ESCALADE (2023, 2024), bulletin 11008941: This technical bulletin provides a procedure to correct the condition of Malfunction Indicator Lamp Illuminated with Active DTC P0102 and Possibly U060F and U1346 at the Mass Air Flow Sensor.
  • CHEVROLET CORVETTE (2020, 2021, 2022), bulletin 10209398: This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the Service Engine Soon (SES) lamp illuminated on the driver i…

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.