U0076: Control Module Communication Bus D Off

U0076 means a control module has gone 'bus off' on communication bus D: its CAN controller counted so many transmit errors that, as the CAN protocol requires, it stopped sending. SAE numbers these codes by bus letter (U0073 bus A, U0074 bus B, U0075 bus C and so on up to U007F); the assignment of letters to networks is the manufacturer's. Until the controller recovers, the module cannot exchange data, so its own functions and those that depend on its messages drop out.

Medium severity. Can I keep driving?It depends on which control module has dropped out. If it affects the engine, brakes, or steering, do not continue your trip: call for roadside assistance.

Symptoms

Several warning lights at once
Lost-communication codes stored in other modules
Functions of modules on this bus inoperative
Scan tool cannot reach some modules

Most likely causes

Shorted or open bus wiring
Faulty bus termination
Defective transceiver in the reporting module

What to check, in order

Start with the simplest. You can tick off each step.

Check the battery and terminals, and read the codes from all control modules with a multi-system scanner
Identify which control module is not responding and check its fuses, power supply, and grounds
Disconnect add-on accessories, such as alarms or trackers, and read the codes again
Inspect the network connectors for moisture or bent pins
Measure the network's resistance and signal using the manufacturer's wiring diagram

Good to know

Repair difficulty: hard
It can trigger limp mode.

What each character of U0076 means

U: Communication network
0: Generic code: same on every make
0: Subsystem depends on the code range
76: Specific fault in that system

Frequently asked questions

Can I keep driving with code U0076?

It depends on which control module has dropped out. If it affects the engine, brakes, or steering, do not continue your trip: call for roadside assistance.

What causes code U0076?

The most common causes are: shorted or open bus wiring; faulty bus termination; defective transceiver in the reporting module.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.