AutoCodes – GMC – B3055 GMC

B3055 GMC Code - No Transponder Modulation or No Transponder

Quick Answer

When a keyless entry transmitter is inserted into the transmitter pocket/slot and the ignition mode switch is pressed, the transponder embedded in the transmitter is energized by the immobilizer antenna exciter coil. Common causes include Faulty Key, Faulty Immobilizer Control Module. 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: B3055 GMC indicates No Transponder Modulation or No Transponder.
Common causes: Common causes include Faulty Key, Faulty Immobilizer Control Module.
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 Popularity 6,864

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 08, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B3055 GMC Description

When a keyless entry transmitter is inserted into the transmitter pocket/slot and the ignition mode switch is pressed, the transponder embedded in the transmitter is energized by the immobilizer antenna exciter coil. The transponder transmits a signal to the immobilizer control module. The immobilizer control module translates this signal to a serial data message which is sent to the Body Control Module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the Engine Control Module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM. The Diagnostic Trouble Code (DTC) will be set when the BCM is unable to measure the ignition key/transmitter transponder value.

OBDII Code B3055 GMC - No Transponder Modulation or No Transponder - AutoCodes.com — B3055 GMC Code - No Transponder Modulation or No Transponder

What does this mean?

What are the Possible Causes of the DTC B3055 GMC?

Faulty Key
Faulty Immobilizer Control Module

How to Fix the DTC B3055 GMC?

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 does this mean?

Code Tech Notes

There is a Factory Service Bulletin for some vehicles with no crank and with the B3055 code: If the vehicle will not crank, remove the key and make sure it is fully extended. Reinsert the ignition key in the extended straight-out position and turn to crank the engine. Note: This condition can set DTC B3055 (No Transponder or Modulation) in history. Clear the B3055 from history and recheck keys that are learned to verify keys are operating correctly.

Buick, Chevrolet, GM Vehicles Factory Service Bulletin OBDII Code B3055

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B3055 GMC 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.

Need more information about the B3055 GMC code?

Need more information on how to fix the B3055 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B3055 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

B3055 2014 GMC Sierra — No Transponder Modulation or No Transponder
B3055 2015 GMC Sierra — No Transponder Modulation or No Transponder
B3055 2016 GMC Sierra — No Transponder Modulation or No Transponder
B3055 2017 GMC Sierra — No Transponder Modulation or No Transponder
B3055 2018 GMC Sierra — No Transponder Modulation or No Transponder

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B3055 GMC Code

1. What are the common symptoms of OBDII code B3055 GMC?

- Common symptoms include issues with starting the vehicle, a disabled fuel injector, and the security light staying on.

2. What does the OBDII code B3055 GMC indicate?

- The code indicates that there is no transponder modulation or no transponder detected by the vehicle's anti-theft system.

3. What are the possible causes of the B3055 GMC code?

- Possible causes include a faulty ignition key, a defective transponder in the key, a damaged key cylinder, or an issue with the vehicle's anti-theft system.

4. How can I diagnose the B3055 GMC code?

- Diagnosis involves checking the ignition key, verifying the transponder signal, inspecting the key cylinder, and testing the anti-theft system for faults.

5. Can I repair the B3055 GMC code myself?

- Repairing this code may require specialized tools and knowledge, so it is recommended to consult a professional automotive technician for proper diagnosis and repair.

6. Is it safe to continue driving with the B3055 GMC code?

- It is not recommended to drive the vehicle with this code present, as it may lead to starting issues and potential security risks due to the anti-theft system not functioning properly.

7. How much does it typically cost to repair the B3055 GMC code?

- The cost of repair can vary depending on the underlying issue causing the code. It's best to get a diagnostic assessment from a qualified mechanic to determine the exact cost.

8. Can a key reprogramming fix the B3055 GMC code?

- Key reprogramming may resolve the issue if the problem lies with the transponder signal or key programming. However, it's important to first diagnose the exact cause before attempting reprogramming.

9. Will disconnecting the battery reset the B3055 GMC code?

- Disconnecting the battery may temporarily clear the code, but it is not a permanent solution. The underlying issue causing the code needs to be addressed to prevent it from reoccurring.

10. How long does it take to repair the B3055 GMC code?

- The repair time can vary depending on the cause of the code and the complexity of the repair needed. It's best to consult with a mechanic for a more accurate estimate of the repair timeframe.