B2798 Lexus Code - Communication Malfunction No. 2 Immobilizer System
Quick Answer
The Diagnostic Trouble Code (DTC) B2798 is stored when a key is inserted into the ignition key cylinder, but a communication error occurs between the key and Transponder Key ECU Assembly. Common causes include Faulty Key, Faulty Transponder Key Coil, Faulty Transponder Key ECU Assembly. 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, Faulty Transponder Key Coil, Faulty Transponder Key ECU Assembly.
- 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 B2798 Lexus Description
What are the Possible Causes of the DTC B2798 Lexus?
- Faulty Key
- Faulty Transponder Key Coil
- Faulty Transponder Key ECU Assembly
How to Fix the DTC B2798 Lexus?
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 B2798 Lexus 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.
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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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