B156C 2016 Toyota RAV4 Code - Extension Module Disconnected

Code B156C indicates that the extension module in the vehicle is disconnected.

Common symptoms include the malfunction indicator light (MIL) illuminating on the dashboard and potential issues with certain vehicle systems.

The extension module can become disconnected due to loose wiring connections, a faulty module, or issues with the vehicle's electrical system.

Diagnosing this code typically involves checking the wiring connections to the extension module, testing the module itself, and inspecting the vehicle's electrical system for any faults.

It is generally not recommended to drive the vehicle with this code present, as it may indicate potential issues with critical vehicle systems.

Repairing this code involves reconnecting the extension module, replacing any faulty wiring or components, and clearing the code with a diagnostic tool.

While the code itself may not always indicate a severe problem, it is important to address it promptly to prevent any potential issues with the vehicle's systems.

Resetting the code without addressing the underlying problem may temporarily turn off the MIL, but the issue is likely to recur if not properly repaired.

The cost of fixing this code can vary depending on the specific cause of the issue, but it may involve labor costs for diagnosis and repair, as well as potential part replacements.

While some enthusiasts may have the skills to diagnose and repair this code themselves, it is recommended to consult a professional mechanic for accurate diagnosis and safe repair.