B156C 2013 Toyota RAV4 Code - Extension Module Disconnected

The code B156C indicates that the Extension Module is Disconnected in the vehicle.

Common symptoms include the malfunction indicator light (MIL) being illuminated on the dashboard and potential issues with vehicle communication systems.

The code B156C can be triggered by a loose or disconnected connection in the extension module, a faulty extension module itself, or wiring issues.

Diagnosing this code typically involves checking the connections to the extension module, inspecting the wiring for any damage, and using a diagnostic scanner to retrieve specific information.

It is generally not recommended to drive the vehicle with a persistent OBDII code as it may indicate underlying issues that could affect the vehicle's performance and safety.

To repair this code, you may need to address any loose connections, replace a faulty extension module, or repair damaged wiring. It is advisable to consult a professional mechanic for a proper diagnosis and repair.

Resetting the code without addressing the underlying issue is considered a temporary solution. It is important to diagnose and repair the root cause to prevent the code from reoccurring.

While some basic checks like inspecting connections and wiring can be done by a DIY enthusiast, diagnosing and repairing the code may require advanced tools and expertise, so consulting a professional is recommended.

While the code itself may not directly impact fuel efficiency, unresolved issues related to the code could potentially affect the vehicle's overall performance, including fuel efficiency.

The cost of repairing this code can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is best to get a professional assessment to determine the specific repair cost.