B3055 on 2015-2022 GMC Yukon: Causes and Fixes for No Start & Security Light

What's Unique About the 2015-2022 Gmc YUKON

On this generation of GMC Yukon and its platform mates (Tahoe, Suburban, Escalade), the B3055 code is frequently linked to intermittent issues rather than hard failures. GM has issued several versions of Technical Service Bulletin PIC5650, with the latest being PIC5650K, highlighting causes like radio frequency (RFID) interference from other cards on a keychain, aftermarket phone chargers, or even non-standard LED interior lights. This means that before replacing expensive parts, it's crucial to rule out these simple, platform-specific environmental and usage factors that can "jam" the key's signal.

Diagnostic Flowchart

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

Generation note: This year range covers the end of the fourth generation (2015-2020, K2XX platform) and the beginning of the fifth generation (2021-2022, T1XX platform). While the fundamental meaning of B3055 is the same, the specific components (key fobs, push-start systems vs. keyed ignition) may differ. The diagnostic approach, however, remains consistent across both generations, focusing on key, antenna, and interference.

Symptoms You May Notice

• Engine will not crank or turn over
• Engine starts briefly and then immediately stalls.
• Security indicator light is illuminated or flashing on the instrument cluster.
• "Service Theft Deterrent System" message on the driver information center.

Most Likely Causes

1. Damaged or Defective Key Transponder 🔴 High Probability The RFID chip embedded in the plastic head of the key can be damaged from being dropped, from age, or internal failure. This is the most common failure point.
   How to confirm: The simplest test is to try starting the vehicle with a second, known-good key. If the vehicle starts and runs with the spare key, the first key is faulty. A technician can also use a scan tool to see if the BCM detects a key present when it is in the ignition.
   Typical fix: Replace the faulty key. A new key must be purchased, cut, and then programmed to the vehicle using a specialized scan tool or by performing a 30-minute relearn procedure. 🎬 See this walkthrough on how to program a new GMC key.
   Est. part cost: $70-$200
2. Radio Frequency (RFID) Interference 🟡 Medium Probability As noted in GM TSB PIC5650M and its successors, other RFID-enabled cards (office access cards, gas station payment cards), other car keys, and even aftermarket electronics like phone chargers or LED lights can block or interfere with the 125 kHz signal from the ignition key.
   How to confirm: Remove all other keys, cards, and aftermarket chargers from the vehicle. Try to start the vehicle with the key isolated. If it starts consistently, interference was the cause.
   Typical fix: Keep RFID-enabled cards and devices on a separate keychain from the vehicle's ignition key. Remove low-quality aftermarket chargers and LED bulbs.
   Est. part cost: $0
3. Faulty Immobilizer Exciter/Antenna Ring 🟡 Medium Probability This component is a coil of fine wire that can break or develop a poor connection over time, preventing it from energizing the key's transponder.
   How to confirm: A technician can test the resistance of the exciter ring and check for a signal with an oscilloscope. If all keys fail to start the vehicle and there is no interference, the exciter ring is a primary suspect. A scan tool may show 'Not Present' for the transponder key status even with a known good key.
   Typical fix: Replace the immobilizer exciter ring, which is located around the ignition lock cylinder. 🎬 Watch: How to test and replace the immobilizer antenna ring.
   Est. part cost: $50-$150
4. Incorrect Key Usage (Switchblade Keys) ⚪ Low Probability GM TSB PIT5030E notes that if the flip-out key is not fully extended and locked, its transponder may be too far from the antenna to be read correctly, causing an intermittent B3055.
   How to confirm: Ensure the key is fully flipped out and locked in the straight position before inserting it into the ignition. If the no-start issue disappears, this was the cause.
   Typical fix: Educate the driver on the correct usage of the key. No parts are required.
   Est. part cost: $0

Rare But Worth Checking

• Faulty Body Control Module (BCM): This is the least likely cause and should only be considered after all other possibilities (key, interference, antenna, wiring) have been thoroughly ruled out. Replacing a BCM is expensive ($500-$1000+) and requires programming to the vehicle's VIN.
• Wiring Harness Damage: Damage to the wiring between the exciter ring and the BCM can cause this code. This is uncommon but possible, especially if other electrical work has been performed under the dash. A diagnostic check would involve testing for continuity and shorts in the signal circuit.
• Low Battery Voltage: While not a direct cause of B3055, very low system voltage can cause various electronic modules, including the BCM, to behave erratically and set false codes. Always ensure the battery is fully charged and connections are clean before extensive diagnostics.

Diagnosis Steps

1. Scan the Body Control Module (BCM) for DTCs. Confirm B3055 is present and active.
2. Question the driver about any RFID cards on their keychain, aftermarket chargers, or if they have had issues with the switchblade key not being fully extended.
3. Remove all other items from the key ring and disconnect any aftermarket accessories. Attempt to start the vehicle.
4. Attempt to start the vehicle with a second, known-good key. If it starts, the primary key is faulty.
5. If all keys fail, inspect the wiring and connector at the ignition switch/immobilizer antenna for any visible damage or looseness.
6. Using a capable scan tool, monitor the immobilizer data in the BCM (e.g., 'Transponder Key Status'). Check if it changes from 'Not Present' to 'Present' when a key is inserted.
7. If no key is ever detected, test the resistance and signal from the immobilizer exciter/antenna ring. This may require an ohmmeter or oscilloscope.
8. If the antenna and wiring test good, and multiple known-good keys do not work, the final step is to diagnose the Body Control Module (BCM) itself.

Parts You'll Likely Need

• Transponder Ignition Key (OEM #13504200 (Superceded by multiple numbers)) — The transponder chip in the original key is the most common point of failure for this code.
  Trusted brands: ACDelco, Strattec
  OEM price range: $100-$200
  Aftermarket price range: $40-$90
• Immobilizer Antenna Ring (OEM #13584827 or 22738087 (Varies by year/model)) — This part reads the key. If it fails, no key will be recognized. It's the second most likely hardware failure after the key itself.
  Trusted brands: ACDelco (GM Genuine)
  OEM price range: $60-$150
  Aftermarket price range: $40-$80

Related Codes That Often Appear With This One

• B3060 — This code often relates to a problem with the transponder key signal circuit, directly related to the B3055 fault.
• B3935 — This code indicates a transponder key authentication failure, which is a logical companion code to B3055 when the key cannot be read.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M (and successors like PIC5650K): Addresses intermittent no crank, no start, or start/stall with security light on, specifically mentioning DTC B3055 and the possibility of RFID interference from a wide range of sources including toll passes, other keys, and aftermarket electronics.
• PIE0232: An earlier bulletin for 2013 models that also documents the no-crank/no-start condition with code B3055, requesting dealer feedback for engineering analysis on low-mileage vehicles.
• PIT5030E: Documents an intermittent no-crank caused by the flip-out key not being fully extended, which can set a B3055.

Platform-Specific Known Issues

• A known issue, documented in TSB PIC5650M and its later revisions, involves intermittent no-start conditions due to this code, with a strong recommendation to check for external radio frequency interference from devices on the owner's keychain before replacing parts.
• Owners on forums report success with the simple '30-minute relearn' procedure after replacing a key, though a scan tool is the official method. This involves cycling the key to 'ON' for three consecutive 10-minute intervals.

Mechanic-Grade Diagnostic Values

• Immobilizer Exciter Coil Resistance — expected: A low resistance value, likely between 0.4 and 2.0 ohms. No official spec is published.. Failure: An open circuit (infinite resistance or 'OL') indicates a broken coil winding. A reading of 0 ohms would indicate a short.
• Theft Deterrent Module Ground Circuit Resistance — expected: Less than 10 ohms between the ground circuit terminal at the module connector and a known good chassis ground.. Failure: Resistance higher than 10 ohms indicates a poor ground connection (corrosion, loose bolt) that needs to be located and cleaned.
• Theft Deterrent Module Signal Circuit Voltage — expected: Less than 1.0 V with the ignition ON.. Failure: Voltage significantly higher than 1.0 V suggests a short to voltage in the wiring harness.
• Theft Deterrent Module Signal Circuit to Ground — expected: Infinite resistance ('OL') with the ignition OFF.. Failure: Any reading less than infinite indicates a short to ground in the wiring harness.

Hidden / Shadow Codes Worth Checking

• B3055 00: The '00' is a 2-digit symptom byte. For this specific DTC, GM defines this as 'No Sub Type Information', meaning the base code's description ('No Transponder Modulation') is the complete fault description without further detail provided by the symptom byte. (see via A professional scan tool like GM GDS2 that can read manufacturer-specific codes and their symptom bytes.)

Scan Tool Commands That Help

• GM GDS2: Immobilizer Learn (or Add/Replace Keys) — This function is required after replacing a key or the Body Control Module (BCM). It guides the technician through the 10-minute (or 3x10 minute) security relearn process to program the new component to the vehicle. It's found under BCM or Immobilizer > Configuration/Reset Functions.
• GM GDS2 / Professional Scan Tool: Live Data Monitoring (Immobilizer Data) — When diagnosing a no-start, monitor the 'Transponder Key Status' or 'Environment Identification' PID. It should change from 'Not Present' or 'No Key Detected' to 'Present' or 'Valid Key' when a known-good key is inserted. If it never changes, it points to a faulty antenna or wiring.
• GM GDS2: BCM Bidirectional Controls — To verify the BCM itself is functional, a technician can use bidirectional controls to command other BCM-controlled outputs (like power locks, interior lights, etc.). If these functions work, it increases confidence that the BCM is powered, grounded, and operating, pointing the diagnosis back toward the key or antenna circuit.

Wiring & Ground Locations

• BCM Location — Behind the lower dashboard panel, to the left of the steering column on the driver's side.. The BCM is the control module for the immobilizer system. All related wiring for the key antenna and security system terminates here. Access is required for any circuit testing.
• G103 — On the cowl in the left rear of the engine compartment, often located above the brake booster.. This is a primary ground point that serves the Body Control Module (BCM), Data Link Connector (DLC), and Instrument Panel Cluster (IPC). A loose or corroded G103 can cause erratic BCM behavior and set false security codes.
• A-Pillar Ground — Inside the cab, near the base of the driver-side A-pillar, beside the front left speaker. Requires removing the pillar trim and dash trim to access.. This is another critical interior ground point for the BCM. Forum users report that cleaning this ground can resolve strange electrical issues, including those related to the BCM and security system.
• Frame Ground (Driver Side) — On the frame rail under the vehicle, near the driver's side door/A-pillar area.. This is a major chassis ground point. While not directly for the BCM, a poor connection here can create electrical noise and voltage drops throughout the vehicle, indirectly affecting sensitive modules like the BCM.

Real Owner Repair Stories

• YouTube channel 'Hands On Auto Training' (2015 Chevrolet Malibu (similar platform/system)) — No crank, no start with active code B3055.
  ❌ Tried (didn't work) Clearing codes (B3055 returned immediately).
  ✅ What actually fixed it The technician used a tool to confirm the ignition's exciter coil was producing a signal, which ruled out the antenna. The scan tool data showed 'no key detected.' This isolated the fault to the key itself. Replacing the transponder key and performing a 10-minute security relearn with a scan tool (Auto Propad) resolved the issue.
• YouTube channel 'ADD AUTOMOBILE SERVICES' (2013 Chevrolet Equinox (similar platform/system)) — Intermittent no start, security light stays on, code B3055 (No Transponder Modulation).
  ❌ Tried (didn't work) The original key would sometimes work and sometimes not, indicating an intermittent failure.
  ✅ What actually fixed it The technician diagnosed a failing transponder chip inside the original key. Instead of a full replacement, he used a VVDI key tool to clone the data from the intermittently-failing chip onto a new, blank 'super chip'. He then placed this newly cloned chip inside the original key fob alongside the old one. This provided a reliable, redundant signal that the car could read every time, fixing the intermittent no-start.

OEM Part Supersession History

• 13504200 → 13504205, 13585811, 23335583 (and others) — Standard part evolution and supplier changes.
  Heads up: This is a 4-button flip key for standard keyed ignitions (FCC ID: OHT01060512). It is NOT compatible with push-to-start ignition systems. Always verify the correct part number by VIN.

Model Year Variations Within This Range

• 2015-2020 (Keyed Ignition): These models primarily use a traditional metal key (often a flip-key) with a transponder chip. B3055 is triggered when the exciter coil/antenna ring around the ignition cylinder fails to read this chip.
• 2021-2022 (Push-to-Start Common): These models more commonly feature push-to-start systems. B3055 still means 'key not detected,' but the mechanism is different. The BCM looks for a signal from the key fob via multiple low-frequency antennas inside the cabin. The code can set if these antennas fail, if there's heavy RFI, or if the fob is not detected in the backup slot (usually in the center console) when attempting a start with a dead fob battery.