U007B 2014 Chevrolet Silverado Code - Control Module Communication High Speed Extension CAN Bus Off

The U007B code indicates a problem with the high-speed CAN (Controller Area Network) bus communication, specifically the "Bus Off" state, which means the system has detected a failure in communication between control modules.

Common symptoms include warning lights on the dashboard, such as the check engine light, erratic vehicle behavior, communication errors during diagnostics, or loss of functionality in certain systems like traction control or ABS.

The most common causes include damaged or corroded wiring in the CAN bus system, faulty control modules, poor electrical connections, or a failing CAN bus transceiver.

Yes, a weak or failing battery can lead to voltage drops, which may disrupt communication within the CAN bus system and trigger the U007B code.

Diagnosis typically involves using a scan tool to check for related codes, inspecting the CAN bus wiring and connectors for damage or corrosion, and testing the voltage and ground connections of the affected control modules.

While the vehicle may still drive, it is not recommended as the code indicates a communication issue that could lead to impaired functionality of critical systems like ABS or stability control.

Repairs may include repairing or replacing damaged CAN bus wiring, cleaning corroded connectors, replacing a faulty control module, or addressing any power or grounding issues.

No, the U007B code often points to wiring or connection issues rather than a defective control module. Thorough diagnosis is essential before replacing any components.

In some cases, a software update for the control modules may resolve communication issues if the problem is related to outdated programming.

Repair costs vary depending on the cause but typically range from $100 for minor wiring repairs to $500 or more if a control module replacement is needed.