B305C Cadillac 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 Cadillac 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 Cadillac Description
What are the Possible Causes of the DTC B305C Cadillac?
- Faulty Key/Transmitter
- Faulty Body Control Module (BCM)
How to Fix the DTC B305C Cadillac?
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 Cadillac 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 B305C Cadillac Code
1. What does OBDII code B305C mean on a Cadillac?
Code B305C indicates that the immobilizer transponder of the wrong type has been programmed, which prevents the vehicle from recognizing the key or starting.
2. What are the common symptoms of code B305C in a Cadillac?
Symptoms include the vehicle not starting, the security light staying illuminated, or trouble unlocking certain vehicle functions.
3. What causes code B305C to appear?
The code is typically caused by programming an incompatible or incorrect transponder key, a defective key, or issues with the immobilizer system.
4. How can code B305C be diagnosed?
Diagnosing involves using an OBDII scanner to confirm the code, checking the programmed key type, and inspecting the immobilizer and transponder system.
5. Can a dead key fob battery cause code B305C?
No, a dead key fob battery will not directly trigger this code, but it can prevent communication between the key and immobilizer system.
6. How do you fix code B305C on a Cadillac?
The solution typically involves reprogramming the correct transponder key, replacing a defective key, or repairing the immobilizer system.
7. Do you need a dealership to fix code B305C?
While some locksmiths can program keys, resolving immobilizer issues often requires specialized tools available at dealerships.
8. Can code B305C be caused by an aftermarket transponder key?
Yes, aftermarket keys that are not compatible with the vehicle’s immobilizer system can trigger this code.
9. Is code B305C a serious issue?
Yes, it prevents the vehicle from starting, making it impossible to drive until the issue is resolved.
10. How much does it cost to fix code B305C on a Cadillac?
Repair costs can vary but typically range from $100 to $300 for key reprogramming or replacement, with higher costs for immobilizer system repairs.
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