U0073 — Control module communication bus A off

Code U0073 is a standard OBD-II diagnostic trouble code: Control module communication bus A off.

In our record, U0073 is reported most often on Chevrolet, Toyota and GMC vehicles , against electrical and steering failure patterns , across 2007–2024 model years.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite U0073 across 22 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report U0073 22 patterns

2024 Chevrolet Traverse

electrical — CAN Bus Communication Failure (U0073)

2023 GMC Sierra

powertrain — Transmission rear wheel lock-up / limp mode

2020 Chevrolet Malibu

electrical — Loss of Engine Power and Complete Shutdown

2018 Chevrolet Malibu

electrical — Check Engine Light / Engine Power Reduced

2018 Toyota Camry

engine — Electric Water Pump Failure

2017 Chevrolet Trax

steering — Power Steering System Electrical Failure / Module Malfunction

2016 Chevrolet Colorado

steering — Intermittent power steering loss with voltage drop

2015 Buick Encore

electrical — Intermittent System Shutdown/Loss of Power

2015 Ford Focus

electrical — Stalling and power loss while driving

2014 Chevrolet Silverado

electrical — Complete electrical shutdown and loss of power while driving

2013 Subaru XV CrossTrek

electrical — CAN bus communication fault

2012 Chevrolet Equinox

powertrain — Transmission Hard Shifts, Lurching, & Loss of Power

2012 Toyota Prius

electrical — Inverter/IPM failure

2011 Chevrolet Equinox

electrical — Engine stalling and loss of power while driving

2011 Chevrolet Equinox

steering — Engine stall with simultaneous loss of steering control

2011 Chevrolet Tahoe

electrical — Intermittent power loss and electrical dropout

2011 Chevrolet Silverado

cruise control — Unintended acceleration / stuck accelerator pedal

2008 Chevrolet Cobalt

electrical — Unintended Engine Shutdown While Driving

2008 Chevrolet Tahoe

electrical — Electrical system power loss and intermittent control failures

2007 Pontiac Torrent

steering — Electronic Power Steering Failure / Loss of Assist

2007 Toyota Camry

cruise control — ABS/VSC actuator failure (primarily hybrid models)

2007 Toyota Camry

electrical — Instrument Cluster Malfunction—Dashboard Gauges

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →