B2798 Lexus Code - Communication Malfunction No. 2 Immobilizer System
Quick Answer
The B2798 diagnostic trouble code for Lexus vehicles indicates a communication malfunction within the No. Common causes include Faulty key transponder, Malfunctioning immobilizer ECU, Wiring issues or loose connections. 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
- B2798 Lexus indicates Communication Malfunction No. 2 Immobilizer System.
- Common causes
- Common causes include Faulty key transponder, Malfunctioning immobilizer ECU, Wiring issues or loose connections.
- 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.
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Code B2798 Lexus Description
The B2798 diagnostic trouble code for Lexus vehicles indicates a communication malfunction within the No. 2 immobilizer system. The immobilizer system is a security feature that prevents unauthorized access to the vehicle by requiring a specific key or key fob to start the engine. When this code is triggered, it means that there is a communication issue between the immobilizer system components, such as the key transponder, immobilizer ECU, or engine control module (ECM).
Common Causes of B2798 Lexus
- Faulty key transponder
- Malfunctioning immobilizer ECU
- Wiring issues or loose connections
- ECM software glitches
- Water damage to immobilizer components
Symptoms of B2798 Lexus
- Engine not starting or starting intermittently
- Engine stalling while driving
- Inability to turn the ignition key
- Security light flashing on the dashboard
How to Fix B2798 Lexus
- Begin by checking and replacing the key transponder if it is faulty.
- Inspect the immobilizer ECU for any damage or malfunctions, replacing it if necessary.
- Check all wiring connections related to the immobilizer system for any loose or damaged wires, repairing or replacing them as needed.
- Scan the ECM for any software glitches and update or reprogram the software if required.
- Test the immobilizer system after repairs to ensure proper communication and functionality.
Cost to Fix B2798 Lexus
The cost of repairing a communication malfunction in the No. 2 immobilizer system (B2798 code) for a Lexus vehicle can vary depending on the extent of the issue and the specific components that need to be replaced. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, it is important to note that diagnosis time and labor rates at auto repair shops can vary significantly based on location, vehicle make and model, and engine type. It is advisable to consult with a trusted mechanic or dealership to get a more accurate estimate for this repair.
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Frequently Asked Questions about B2798 Lexus Code
1. What are the common symptoms of OBDII code B2798 in a Lexus related to Communication Malfunction No. 2 Immobilizer System?
- Common symptoms include difficulty starting the vehicle, the engine not turning over, and the immobilizer light staying illuminated.
2. What are the possible causes of OBDII code B2798 in a Lexus?
- Possible causes include a faulty immobilizer system, issues with the key or key transponder, wiring problems, or a malfunction in the communication network.
3. How can I diagnose the OBDII code B2798 in a Lexus?
- Diagnosis involves checking the key transponder, inspecting the wiring for damage, and using a diagnostic scanner to read the trouble codes stored in the vehicle's computer.
4. Is it safe to continue driving my Lexus with OBDII code B2798 present?
- It is not recommended to drive the vehicle with this code active, as it may lead to starting issues or potential immobilization of the vehicle.
5. Can I repair OBDII code B2798 in my Lexus myself?
- While some simple checks like inspecting the key and wiring can be done at home, resolving the issue may require specialized knowledge and tools, so it's advisable to consult a professional mechanic.
6. How much does it typically cost to repair OBDII code B2798 in a Lexus?
- Repair costs can vary depending on the underlying cause of the issue, but expect to pay anywhere from $100 to $500 for parts and labor.
7. Will resetting the OBDII code B2798 clear the issue in my Lexus?
- Resetting the code may temporarily clear the warning light, but it is essential to address the root cause of the problem to prevent it from recurring.
8. Can a weak car battery trigger OBDII code B2798 in a Lexus?
- Yes, a weak car battery can sometimes cause communication malfunctions within the immobilizer system, leading to the triggering of this OBDII code.
9. How long does it take to repair OBDII code B2798 in a Lexus?
- The repair time can vary based on the specific issue, but most repairs related to Communication Malfunction No. 2 Immobilizer System can be completed within a few hours to a day.
10. Is OBDII code B2798 a common issue in Lexus vehicles?
- While not extremely common, issues related to Communication Malfunction No. 2 Immobilizer System can occur in Lexus vehicles, especially in older models or those with high mileage.
Discuss the causes and fixes for B2798 Lexus OBDII Code
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I have a 2001 ls 430 the battery is good but it appears to need a jump every so often so I replaced the battery with a new one today it started fine then later in the day it appeared to need a jump again I check to see if it was the alternator it was good. Could it be the key
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I doubt the key will cause the problem, something else must be draining the battery. Do you have any aftermarket accessories (e.g. amplifier, audio unit)?
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My key is some what bent, would this cause the B2798 code to go off... What would be the next step to getting this resolved? thanks
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If only the metal part is bent, then it shouldn't set the B2798 code. What model and yer is your vehicle? Do you have any other symptoms?
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