U0076Network Communication

Control Module Communication Bus C Off

U0076 means a control module detected too many errors on communication bus C and shut off its transmitter (bus-off). It usually points to a wiring short, a failing module, or termination problems.

🚗 Not recommended. A bus-off condition on bus C means affected modules have stopped communicating.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Bus C wiring short or open$50-$500

45%

A short or open on bus C generates enough errors to force bus-off.

#2Failed module on bus C$300-$1200

30%

One faulty module can flood the bus with errors.

#3Termination or connector fault$50-$300

15%

Bad termination or connectors disrupt the bus.

🩺 Common Symptoms

Modules on bus C offline
Warning lights
No communication with some modules
Erratic behavior
Other U-codes stored

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$150-$1000

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose U0076

1Identify which modules are on bus C

2Measure bus resistance and check for shorts or opens

3Disconnect bus C modules one at a time to isolate a faulty unit

4Repair the fault and clear the bus-off condition

❓ Frequently Asked Questions

Can I drive with U0076?

Not safely. Modules on bus C have stopped communicating. Diagnose it first.

What causes U0076?

Usually a wiring short or open on bus C, or a single failing module flooding that network.

What is bus C?

It is one of several separate CAN networks in the vehicle, connecting its own group of modules.

🔗 Related Codes

U0073U0074U0001U0100