B2798 2015 Toyota RAV4 Code - Communication Malfunction No. 2 Immobilizer System

The common symptoms include difficulty starting the vehicle, the engine not turning over, and the immobilizer light staying illuminated on the dashboard.

This code indicates a communication error between the immobilizer system and the engine control module (ECM), leading to a potential immobilizer system malfunction.

Possible causes include a faulty immobilizer system, damaged wiring or connectors between the immobilizer system and ECM, or a malfunction in the ECM itself.

Diagnosis involves using a professional OBDII scanner to retrieve the specific error code, checking the immobilizer system components for physical damage, and inspecting the wiring and connectors for any issues.

It is not recommended to drive the vehicle with this code active, as it may lead to potential starting or engine operation issues due to the communication malfunction between the immobilizer system and ECM.

While you can clear the code with an OBDII scanner, it is essential to diagnose and repair the underlying issue causing the code to prevent it from reoccurring.

The cost of repairs can vary depending on the exact cause of the code, but it may involve replacing the immobilizer system components, repairing damaged wiring, or addressing ECM issues, potentially ranging from a few hundred to over a thousand dollars.

While diagnosing and repairing this code may be challenging for DIY enthusiasts due to the complexity of the immobilizer system, experienced individuals with the right tools and knowledge may be able to address the issue themselves.

While the code itself may not directly impact emissions, the underlying issues causing the code can affect the vehicle's performance, potentially leading to a failed emissions test if left unresolved.

The repair time can vary based on the exact cause of the code and the availability of parts, but it may take anywhere from a few hours to a full day for a professional technician to diagnose and fix the issue.