B305C Code - Immobilizer Transponder Of Wrong Type Programmed
Quick Answer
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coil surrounding the ignition lock cylinder. Common causes include Faulty Key/Transmitter, Faulty Body Control Module (BCM). 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
- B305C indicates Immobilizer Transponder Of Wrong Type Programmed.
- Common causes
- Common causes include Faulty Key/Transmitter, Faulty Body Control Module (BCM).
- 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 B305C Description
What are the Possible Causes of the DTC B305C?
- Faulty Key/Transmitter
- Faulty Body Control Module (BCM)
How to Fix the DTC B305C?
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 B305C 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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Information for Specific Makes
- B305C Buick — Immobilizer Transponder Of Wrong Type Programmed
- B305C Cadillac — Immobilizer Transponder Of Wrong Type Programmed
- B305C Chevrolet — Immobilizer Transponder Of Wrong Type Programmed
- B305C GMC — Immobilizer Transponder Of Wrong Type Programmed
Frequently Asked Questions about B305C Code
1. What does the OBDII code B305C mean?
The code B305C indicates that the immobilizer transponder of the vehicle is of the wrong type or not programmed correctly, preventing proper communication with the vehicle's security system.
2. What are common symptoms of the B305C code?
Symptoms include the engine failing to start, the immobilizer warning light illuminating, or issues with key recognition.
3. What causes the B305C code to appear?
This code is commonly caused by using an incorrect or unprogrammed transponder key, a damaged key, or a fault in the immobilizer system.
4. Can a dead key fob battery trigger the B305C code?
No, a dead key fob battery typically affects remote functions but does not usually cause the B305C code. The issue is more likely related to the transponder itself.
5. How can I fix the B305C code?
To fix the B305C code, ensure the transponder key is the correct type, and have it reprogrammed or replaced by a qualified technician if necessary.
6. Can a faulty immobilizer module cause the B305C code?
Yes, a malfunctioning immobilizer module may cause communication issues, resulting in the B305C code.
7. Do I need a professional to clear the B305C code?
Yes, resolving this code often requires specialized tools and expertise to diagnose and reprogram the immobilizer system.
8. Can replacing the ignition key cylinder fix the B305C code?
Replacing the ignition key cylinder may fix the issue if it includes the transponder, but the new transponder will still need to be programmed to the vehicle.
9. How much does it cost to repair the B305C code?
Repair costs can vary but typically range from $100 to $300, depending on whether a new key or module programming is required.
10. Can the B305C code prevent my car from starting?
Yes, this code can disable the engine start function since the immobilizer system does not recognize the transponder key.
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