B3055 on 2012-2017 Buick Verano: No Start Causes and Fixes

What's Unique About the 2012-2017 Buick VERANO

The Buick Verano from this era, built on the GM Delta II platform, often uses a flip-style key. A very common and platform-specific issue, documented in GM Technical Service Bulletin PIT5030E, is that if the key is not fully extended and locked straight, it can fail to communicate with the ignition, triggering a B3055 code and a no-start condition. Additionally, GM has noted in TSB PIC5650M that radio frequency interference from other fobs, aftermarket electronics like LED lights, and even decorative trim rings on the keychain is a frequent cause for this code on these vehicles.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Engine will not crank or start.
• Security indicator light is on or flashing on the dashboard.
• Message on the Driver Information Center (DIC) such as 'Service Theft Deterrent System' or 'Theft Attempted'.
• Intermittent no-start condition that may resolve itself temporarily.
• Remote start fails to work.

Most Likely Causes

1. Improper Flip Key Position 🔴 High Probability The design of the flip key can lead to user error. If the key blade is not fully extended and locked, its transponder chip may be too far from the ignition's reader coil. This is documented in TSB PIT5030E.
   How to confirm: Remove the key, ensure it is fully clicked open into the straight position, and re-insert it. If the car starts, this was the cause.
   Typical fix: User education. Always make sure the key is fully extended before trying to start the car.
   Est. part cost: $0
2. Radio Frequency Interference (RFI) 🔴 High Probability As noted in TSB PIC5650M, the vehicle's Passkey III+ system (operating at 125 kHz) is sensitive to other RFID-emitting devices. This includes other car keys, gas station speed passes, work ID badges, and even aftermarket electronics.
   How to confirm: Remove all other keys, fobs, and electronic devices from the keychain. Also unplug any aftermarket chargers or accessories (especially USB chargers and LED lights) from the vehicle. Try to start the car with only the Verano key present.
   Typical fix: Keep the vehicle key on a separate ring. Avoid using low-quality aftermarket chargers or LED bulbs, which are known to cause RFI.
   Est. part cost: $0
3. Defective or Damaged Ignition Key 🟡 Medium Probability The transponder chip in the key head can be damaged from drops or wear and tear. A physically broken key blade can also cause misalignment and a no-start with code B3055.
   How to confirm: Try starting the vehicle with a spare key. If the spare key works reliably, the original key is faulty. A technician on Reddit confirmed a case where a customer's broken key was the direct cause.
   Typical fix: Replace the faulty key. A new key must be cut and programmed to the vehicle by a dealer or automotive locksmith. 🎬 Watch: How to program a new spare flip key yourself.
   Est. part cost: $70-$150
4. Weak or Failing Vehicle Battery 🟡 Medium Probability
   How to confirm: Test the vehicle's 12V battery with a multimeter or battery tester. A reading below 12.4 volts with the engine off suggests a weak battery. Low voltage can cause erratic behavior in control modules, including the BCM and theft deterrent system.
   Typical fix: Recharge or replace the vehicle's 12V battery.
   Est. part cost: $150-$250

Rare But Worth Checking

• Faulty Theft Deterrent Exciter Module: This is the antenna ring around the ignition cylinder that powers and reads the key's transponder. If it fails, no key will be read. This is less common than key or interference issues.
• Aftermarket Metallic Trim Ring: A metallic or aluminum decorative ring placed around the ignition cylinder can physically block or shield the radio signal between the key and the exciter module, causing a B3055. This was documented in a repair case on a platform-mate Chevy Cruze.
• Wiring Harness Issue: A loose connection or broken wire between the exciter module and the Body Control Module (BCM) can cause an intermittent signal loss.
• Faulty Body Control Module (BCM): This is the least likely cause. The BCM is the computer that runs the security system. It should only be suspected after all other possibilities, including keys, wiring, and the exciter module, have been ruled out.

Diagnosis Steps

1. Verify the symptom: Confirm the no-crank/no-start condition and check if the security light is illuminated.
2. Check Key Position: If you have a flip key, remove it, ensure it's fully extended and locked, then try again.
3. Isolate the Key: Remove all other keys, fobs, and RFID cards from the keychain. Unplug any aftermarket USB chargers or accessories. Attempt to start the vehicle with the Verano key alone.
4. Inspect Ignition Area: Check for any aftermarket metallic or 'bedazzled' trim rings around the ignition cylinder and remove them.
5. Try the Spare Key: Attempt to start the vehicle with a known-good spare key. If it starts, the primary key is the problem.
6. Check Vehicle Battery: Test the main 12V battery. Voltage should be above 12.4V. Low voltage can cause security system faults. Charge or replace if necessary.
7. Scan for Codes: Use an OBD-II scanner capable of reading B-codes (Body codes) to confirm B3055 is present 🎬 Watch a professional diagnostic scan for code B3055. and check for other related codes.
8. Attempt 30-Minute Key Relearn Procedure: If you have a new key or suspect a programming glitch, you can try the manual relearn. Insert the key and turn to ON. The security light will illuminate. Wait for approximately 10 minutes until the light turns off. Turn the ignition OFF for 5 seconds. Repeat this cycle two more times (for a total of 3 cycles and 30 minutes). 🎬 See a walkthrough of the 30-minute security relearn procedure. After the third cycle, the key should be learned. Note: This procedure will erase all other previously programmed keys.
9. Inspect Wiring: If the problem persists, inspect the wiring and connector at the ignition switch/exciter module for any visible damage or looseness.
10. Professional Diagnosis: If the above steps fail, the vehicle needs to be diagnosed by a professional who can test the exciter module and BCM circuits and program new components if needed.

Parts You'll Likely Need

• Ignition Key (Flip Key) (OEM #13579215 (ACDelco, check fitment)) — The transponder chip in the key is the most common point of failure in this system, either through physical damage, internal failure, or a programming fault.
  Trusted brands: ACDelco
  OEM price range: $70-$150
  Aftermarket price range: $40-$90
• Theft Deterrent Exciter Module (OEM #13523275 (GM), 22738087 (GM)) — This module (antenna) reads the key. If it fails, it cannot communicate with the key's transponder. It's a less common but possible failure point.
  Trusted brands: ACDelco, GM Genuine Parts
  OEM price range: $50-$100
  Aftermarket price range: $30-$70

Related Codes That Often Appear With This One

• B3060 — This code, 'Unprogrammed Transponder Identification Code Received', often appears with B3055. It means a signal was detected but wasn't recognized, which can happen during a key programming failure or general system fault.
• B3935 — This code points to a 'Transponder Authentication Failed' error, meaning a signal was received but was incorrect. It can be set along with B3055 during a security system fault.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank/no start with B3055, suggesting RFI from other devices on the keychain, aftermarket electronics (LEDs, chargers), and even decorative trim as a likely cause.
• PIT5030E: Points to the flip key not being fully extended as a cause for an intermittent no-crank and B3055 on 2012-2014 models and their platform mates.

Platform-Specific Known Issues

• An intermittent no-crank condition on the 2012-2014 Verano is specifically addressed by TSB PIT5030E, which identifies the cause as the flip key not being fully extended.
• TSB PIC5650M covers the 2012-2017 Verano for an intermittent no-start with B3055, pointing to Radio Frequency Interference (RFI) from other devices on the key ring, aftermarket LED lighting, and phone chargers as a primary cause to investigate.

Hidden / Shadow Codes Worth Checking

• B3055 00: The '00' is a GM-specific symptom byte indicating 'No Transponder Modulation'. This is the most common failure type for this code and confirms the BCM received no signal at all from the key. (see via A professional scan tool like GM GDS2 or an advanced aftermarket scanner capable of reading GM-specific body codes and symptom bytes.)
• Scan Tool Live Data: 'Environment Identification': This is not a code, but a live data parameter (PID) viewable in the BCM or immobilizer module data list. When the fault is active, this PID will display 'No Key Detected' or a similar message, confirming the BCM is not seeing the transponder. (see via A professional scan tool like GM GDS2 or Topdon/Autel with access to the BCM data stream.)

Scan Tool Commands That Help

• GM GDS2 (or Techline Connect): Immobilizer Learn / Add or Replace Key Fobs — This function is required after replacing a key or the BCM. It guides the technician through the 10-minute security relearn procedure to program new keys to the vehicle. It is typically found under the 'Body Control Module' or 'Remote Control Door Lock Receiver' menus.
• Autel (e.g., IM608, AutoProPAD) / Topdon: Vehicle Security Learn / Key Programming — Used to perform the same 10-minute key programming procedure as the factory tool. This is necessary when a new key is introduced to the system to resolve a B3055 caused by a faulty key.

Wiring & Ground Locations

• Body Control Module (BCM) — Located on the front passenger side of the center console. On some models, access is gained by removing the storage compartment to the left of the steering wheel.. The BCM is the central computer for the theft deterrent system. It receives the signal from the exciter module and makes the decision to enable or disable starting. All related wiring terminates here.
• Ground Point G103 (Typical) — On similar GM platforms, G103 is located on the cowl in the engine compartment, often above the brake booster.. This ground point is commonly used for the BCM, Instrument Panel Cluster (IPC), and Data Link Connector (DLC). A poor connection at this ground can cause erratic BCM behavior and communication errors, potentially leading to a false B3055 code.

Real Owner Repair Stories

• Hands On Auto Training YouTube Channel (2015 Chevrolet Malibu (platform mate)) — No crank, no start with security light on. Scan tool confirmed current code B3055 and live data showed 'no key detected'.
  ❌ Tried (didn't work) Clearing codes (code immediately returned as current).
  ✅ What actually fixed it The technician replaced the faulty key by swapping the physical key blade into a new key fob with a new transponder chip. They then used an Autel AutoProPAD to perform the 10-minute 'vehicle security learn' procedure, which successfully programmed the new key and resolved the no-start condition.
• ADD AUTOMOBILE SERVICES YouTube Channel (2013 Chevrolet Equinox (similar GM system)) — Intermittent no-start. Security light would sometimes stay on. Code B3055 was present, indicating 'no transponder modulation'. The original key chip was failing intermittently.
  ❌ Tried (didn't work) Simply trying to start the car repeatedly was unreliable.
  ✅ What actually fixed it Instead of a full key replacement, the technician used a VVDI Key Tool to clone the data from the intermittently failing original chip onto a new 'super chip'. This new chip was then placed inside the original key fob housing. This created a redundant signal, ensuring that even if the original chip failed to respond, the new cloned chip would, allowing the vehicle to start reliably.

When the Usual Fixes Don't Work

• While a defective key is a common cause, the failure may be intermittent rather than total. In one documented case on a similar GM vehicle, the key's transponder chip was failing sporadically. The standard advice of 'try the spare key' might not have revealed the issue if the primary key worked some of the time. The ultimate fix was to clone the intermittent key's data onto a new, robust chip and install it in the same key fob, providing a reliable signal without replacing the entire key assembly.

OEM Part Supersession History

• 13502301, 13504286 → 13523275 — Standard part revision and consolidation by the manufacturer.
  Heads up: This is the Theft Deterrent Exciter Module (antenna ring). All versions require programming/relearn procedure after installation.