what does the B2799 code mean on my Toyota RAV4

Toyota RAV4 Fourth Generation (2013-2018)

Error Codes

1-3 hours

Time

medium

Difficulty

high

Severity

Error Code: B2799

3 min read

466 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn to diagnose and fix B2799 engine immobilizer issues in Toyota RAV4. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Error Code

B2799

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock or short circuits.

Symptoms

•Engine won't start
•Security light flashing on the dashboard
•Key fob not recognized by the vehicle
•Intermittent starting issues
•Error message on the dashboard

Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to confirm the B2799 code.
2
Check the battery condition in the key fob and replace if necessary.
3
Inspect the key fob for physical damage or wear.
4
Verify the immobilizer system's wiring and connectors for damage or corrosion.
5
Test the ignition switch for proper function.
6
Check for any additional codes that may provide insight into the immobilizer issue.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Flathead screwdriver
•Multimeter
•Socket set

Parts Required

•Key fob battery (e.g., CR2032)
•Ignition switch (if replacement is necessary)

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Diagnostic Steps

1
Scan the vehicle's computer using an OBD-II scanner to confirm the B2799 code.
2
Check the battery condition in the key fob and replace if necessary.
3
Inspect the key fob for physical damage or wear.
4
Verify the immobilizer system's wiring and connectors for damage or corrosion.
5
Test the ignition switch for proper function.
6
Check for any additional codes that may provide insight into the immobilizer issue.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is in a well-ventilated area.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Key Fob Inspection and Replacement

Remove the key fob casing using a small flathead screwdriver.
Inspect the battery for corrosion or leakage.
Replace the battery with a new one (typically a CR2032).
Reassemble the key fob casing and ensure it clicks securely.

3. Wiring Inspection

Locate the immobilizer control unit under the dashboard.
Visually inspect all wiring and connectors for fraying, damage, or corrosion.
Use a multimeter to check for continuity in the wires leading to the immobilizer unit.
Repair or replace damaged wiring as necessary.

4. Ignition Switch Test

Remove the steering column cover using a socket set.
Disconnect the wiring harness from the ignition switch.
Use a multimeter to test for proper voltage and continuity.
Replace the ignition switch if it fails to meet specifications.

5. Reconnect Battery and Test

Reconnect the negative battery terminal.
Attempt to start the vehicle with the key fob.
Observe the dashboard for the security light.