U0073 on Cadillac
Control Module Communication Bus Off
U0073 on Cadillac vehicles indicates control module communication bus off. Au7o has documented this code across 1 Cadillac model — most commonly on Escalade ESV. U0073 means the vehicle's communication bus has shut down, or 'gone off,' meaning a control module detected so many errors on the network that it stopped transmitting to protect the bus. On a CAN network, repeated faulty signals cause a module to take itself offline, which can cascade into multiple warning lights and disabled features. This is a network/wiring code rather than a single failed sensor, and it usually points to a wiring short, a defective module flooding the bus, or a power/ground issue affecting communication. It often requires checking the whole bus circuit, not just one part. Typical repair costs on Cadillac range from $150 to $3,500, depending on the specific model and root cause.
Common Causes of U0073
- •Short to power or ground on the CAN bus wiring
- •CAN high/low wires shorted together
- •A failing module continuously corrupting bus traffic
- •Corroded, loose, or damaged bus connectors
- •Loss of power or ground to a network module
- •Faulty gateway/central communication module
- •Improper or missing bus terminating resistor
U0073 on Cadillac by Model
Cadillac Escalade ESV(1 issue)
- OLED Curved Display Blackout, Flicker, and Infotainment Module Failures2021-2025
The 38-inch curved OLED display system in the 2021+ Escalade ESV has generated repeated owner complaints for black screens, flickering, frozen infotainment, loss of backup camera image, and intermittent gauge display issues. Reports point to software instability, communication faults between display/control modules, and occasional hardware replacement of the radio or display assembly. Because key vehicle functions are integrated into the screen, failures can affect usability and safety features.
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View U0073 across all makes →Frequently Asked Questions
What does U0073 mean on Cadillac?▼
U0073 stands for "Control Module Communication Bus Off." U0073 means the vehicle's communication bus has shut down, or 'gone off,' meaning a control module detected so many errors on the network that it stopped transmitting to protect the bus. On a CAN network, repeated faulty signals cause a module to take itself offline, which can cascade into multiple warning lights and disabled features. This is a network/wiring code rather than a single failed sensor, and it usually points to a wiring short, a defective module flooding the bus, or a power/ground issue affecting communication. It often requires checking the whole bus circuit, not just one part. On Cadillac specifically, this code is documented across 1 model.
What causes U0073 on Cadillac vehicles?▼
Common causes on Cadillac: Short to power or ground on the CAN bus wiring, CAN high/low wires shorted together, A failing module continuously corrupting bus traffic, Corroded, loose, or damaged bus connectors, Loss of power or ground to a network module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix U0073 on a Cadillac?▼
Repair costs on Cadillac range from $150 to $3,500, depending on the specific model and root cause.
Which Cadillac models have U0073 documented?▼
Au7o has documented U0073 on 1 Cadillac model: Escalade ESV.