B2799 2016 Toyota RAV4 Code - Engine Immobiliser System Malfunction
Quick Answer
The Engine Control Module (ECM) stores this Diagnostic Trouble Code (DTC) when the communication line between the ECM and Transponder Key ECU Assembly is malfunctioning, or the communication ID of the ECM and Transponder Key ECU Assembly does not match. Common causes include Without Smart Key, Faulty Transponder Key ECU Assembly, Transponder Key ECU Assembly harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B2799 2016 Toyota RAV4 indicates Engine Immobiliser System Malfunction.
- Common causes
- Common causes include Without Smart Key, Faulty Transponder Key ECU Assembly, Transponder Key ECU Assembly harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B2799 2016 Toyota RAV4 Description
For vehicles with Smart Key, this DTC will be set when there are communication malfunctions between the ECM and certification ECU (Smart Key ECU Assembly), or when the communication ID codes do not match, the ECM stores this DTC.
Before troubleshooting this DTC, ensure that no DTC is detected in the transponder key ECU. If there is a key code-related DTC detected in the Transponder Key ECU Assembly or Certification ECU (Smart Key ECU Assembly), repair it first.
What are the Possible Causes of the DTC B2799 2016 Toyota RAV4?
-
Without Smart Key
- Faulty Transponder Key ECU Assembly
- Transponder Key ECU Assembly harness is open or shorted
- Transponder Key ECU Assembly circuit poor electrical connection
- Faulty Engine Control Module (ECM)
With Smart Key - Faulty Certification ECU (Smart Key ECU Assembly)
- Certification ECU harness is open or shorted
- Certification ECU circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC B2799 2016 Toyota RAV4?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B2799 2016 Toyota RAV4 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B2799 2016 Toyota RAV4 code?
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Frequently Asked Questions about B2799 2016 Toyota RAV4 Code
What does the OBDII code B2799 mean on a 2016 Toyota RAV4?
It indicates a malfunction in the engine immobilizer system, which prevents unauthorized starting of the vehicle.
What are common symptoms of code B2799 in a 2016 Toyota RAV4?
Symptoms include difficulty starting the engine, the immobilizer warning light staying on, or the vehicle not starting at all.
What causes the B2799 code on a 2016 Toyota RAV4?
Common causes include a faulty key transponder, issues with the immobilizer control unit, wiring problems, or a problem with the ECU.
Can a weak car battery trigger the B2799 code?
Yes, a weak or failing battery can disrupt communication between the immobilizer system components and trigger this code.
How do you diagnose the B2799 code in a 2016 Toyota RAV4?
Technicians use an OBDII scanner to confirm the code and inspect the key transponder, wiring, immobilizer control unit, and ECU for faults.
How can you fix the B2799 code on a 2016 Toyota RAV4?
Repairs may include reprogramming the key, replacing defective components like the transponder or control unit, or fixing damaged wiring.
Can you clear the B2799 code without fixing the issue?
Clearing the code without addressing the underlying issue will only temporarily remove it, and the problem will likely return.
Is replacing the key always necessary for the B2799 code?
No, replacing the key is only necessary if the key’s transponder is damaged or no longer communicates with the immobilizer system.
Can a locksmith help with the B2799 code on a 2016 Toyota RAV4?
Yes, a qualified locksmith can reprogram or replace a damaged key, but other repairs may require a mechanic.
Is it safe to drive with the B2799 code in a 2016 Toyota RAV4?
No, the vehicle may fail to start unexpectedly, so it’s best to address the issue promptly to avoid inconvenience.
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