B3935 2016 GMC Sierra Code - Transponder Authentication
Quick Answer
The B3935 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to transponder authentication. Common causes include Faulty transponder in the key fob, Weak or dead battery in the key fob, Issues with the immobilizer system. 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
- B3935 2016 GMC Sierra indicates Transponder Authentication.
- Common causes
- Common causes include Faulty transponder in the key fob, Weak or dead battery in the key fob, Issues with the immobilizer system.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code B3935 2016 GMC Sierra Description
The B3935 diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to transponder authentication. In modern vehicles, transponders are small electronic devices embedded in key fobs that communicate with the vehicle's immobilizer system to allow the engine to start. When the transponder authentication fails, it means that the vehicle's immobilizer system is unable to recognize the key fob, leading to starting issues or even preventing the engine from starting altogether.
Common Causes of B3935 2016 GMC Sierra
- Faulty transponder in the key fob.
- Weak or dead battery in the key fob.
- Issues with the immobilizer system.
- Wiring or connection problems between the transponder and the immobilizer system.
- Faulty ignition switch.
Symptoms of B3935 2016 GMC Sierra
- Engine cranks but does not start.
- Engine starts and then immediately stalls.
- Key fob not recognized by the vehicle.
- Security light flashing on the dashboard.
- Inability to start the vehicle.
How to Fix B3935 2016 GMC Sierra
- Replace the battery in the key fob: Start by replacing the battery in the key fob to ensure it is transmitting the signal properly.
- Try a spare key fob: If available, try using a spare key fob to see if the issue is with the key itself.
- Check immobilizer system: Have the immobilizer system checked by a professional to diagnose any issues with the system.
- Inspect wiring and connections: Check for any loose or damaged wiring or connections between the transponder and the immobilizer system.
- Replace transponder or ignition switch: If all else fails, consider replacing the transponder in the key fob or the ignition switch if they are found to be faulty.
Cost to Fix B3935 2016 GMC Sierra
The cost of repairing a transponder authentication issue can vary depending on the specific cause of the problem. In general, replacing the battery in the key fob is a relatively inexpensive fix, while replacing the transponder or ignition switch can be more costly. On average, the repair cost for this issue can range from $50 to $300, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.
Need more information about the B3935 2016 GMC Sierra code?
Need more information on how to fix the B3935 2016 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3935 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B3935 2016 GMC Sierra Code
1. What does OBDII code B3935 on a 2016 GMC Sierra indicate?
The B3935 code specifically relates to Transponder Authentication issues in the vehicle's system.
2. What are common symptoms of OBDII code B3935 in a 2016 GMC Sierra?
Common symptoms include issues with starting the vehicle, intermittent stalling, or the vehicle failing to recognize the key fob.
3. What are potential causes of OBDII code B3935 in a 2016 GMC Sierra?
The code may be triggered by a faulty ignition key, a defective transponder, a damaged key fob, or issues with the vehicle's immobilizer system.
4. How can I diagnose OBDII code B3935 in my 2016 GMC Sierra?
Diagnosing the code typically involves using a diagnostic scan tool to retrieve the specific error code and checking the key fob's battery and functionality.
5. Can I repair OBDII code B3935 in my 2016 GMC Sierra myself?
If the issue is related to a faulty key fob battery, you may be able to replace it yourself. However, more complex issues with the transponder or immobilizer system may require professional diagnosis and repair.
6. Will driving with OBDII code B3935 on my 2016 GMC Sierra cause further damage?
Continued driving with this code may lead to persistent starting problems or potential immobilization of the vehicle, so it's best to address the issue promptly.
7. How much does it typically cost to repair OBDII code B3935 in a 2016 GMC Sierra?
The cost of repair can vary depending on the root cause of the issue. Simple fixes like replacing a key fob battery may be relatively inexpensive, while more complex repairs involving the transponder or immobilizer system could be costlier.
8. Can resetting the OBDII system clear the B3935 code in my 2016 GMC Sierra?
Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.
9. How can I prevent OBDII code B3935 from occurring in my 2016 GMC Sierra?
Regularly checking the functionality of your key fob, replacing batteries when needed, and ensuring proper maintenance of the vehicle's immobilizer system can help prevent this code from appearing.
Discuss the causes and fixes for B3935 2016 GMC Sierra OBDII Code
Code B3935 2016 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.