B3055 on 2007-2014 Chevrolet Suburban: No Start Causes and Fixes

What's Unique About the 2007-2014 Chevrolet SUBURBAN

The GMT900 platform, which includes the 2007-2014 Suburban, uses a well-documented Pass-Key III+ (PK3+) immobilizer system. A common issue noted in GM technical service bulletins is that other Radio Frequency Identification (RFID) devices on the keychain can interfere with the key's 125 kHz signal, leading to an intermittent B3055 code. TSB PIC5650M specifically calls out aftermarket LED lights, USB chargers, and toll passes as potential sources of RFI. Another known problem, particularly with flip-style keys as detailed in TSB PIT5030E, is that if the key isn't fully extended and locked, it can sit at an angle in the ignition and fail to communicate, triggering a no-start condition and logging a B3055 in history.

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.
• Engine starts briefly and then shuts off.
• Security light is illuminated or flashing on the dashboard.
• "Service Theft Deterrent System" message on the driver information center.
• "Theft Attempted" message on the driver information center.

Most Likely Causes

1. Faulty or Damaged Ignition Key 🔴 High Probability The transponder chip in the key head is sensitive and can be damaged from being dropped, getting wet, or from the plastic housing breaking. A physically broken key was the direct cause of a B3055 code and a no-start condition in one documented case.
   How to confirm: Try starting the vehicle with a known-good spare key. If the spare key works and the original does not, the original key is faulty. A scan tool can also be used to view the 'TDM Transponder Key' parameter; if it reads 'Not Present' with one key but 'Present' with another, the first key is bad.
   Typical fix: Replace the faulty key and perform the 30-minute key relearn procedure to program the new key to the vehicle.
   Est. part cost: $50-$150
2. Radio Frequency (RF) Interference 🟡 Medium Probability As noted in TSB PIC5650M, other RFID devices like toll passes, building access cards, or even other car keys on the same keychain can interfere with the 125 kHz signal from the ignition key. The bulletin also warns against aftermarket LED lighting and certain phone chargers.
   How to confirm: Remove all other keys and electronic devices from the keychain. Try starting the vehicle with only the single Suburban key. If the problem is intermittent, try to correlate it with the use of a specific electronic device in the car.
   Typical fix: Keep other RFID-enabled cards and fobs separate from the ignition key when starting the vehicle. Remove problematic aftermarket electronics.
   Est. part cost: $0
3. Worn or Faulty Ignition Lock Cylinder/Switch 🟡 Medium Probability The exciter coil (transponder antenna) that energizes the key's chip is integrated into the ignition lock cylinder housing. Over time, the wiring to this coil can break or the coil itself can fail, preventing it from reading any key.
   How to confirm: If multiple known-good keys fail to start the vehicle, and there is no RF interference, the problem is likely in the ignition cylinder assembly or its wiring. A technician can test the circuit for continuity between the TDM and the lock cylinder.
   Typical fix: Replacement of the ignition lock cylinder housing (which contains the sensor) and performing the 30-minute key relearn procedure. The mechanical lock cylinder itself can often be retained or re-pinned.
   Est. part cost: $100-$250
4. Low Vehicle Battery Voltage ⚪ Low Probability Insufficient voltage can cause various electronic modules, including the Theft Deterrent Module, to malfunction and set false codes. A stable voltage above 12V is required for the system to operate and for key relearn procedures to succeed.
   How to confirm: Test the vehicle's battery with a multimeter. A healthy battery should read approximately 12.6 volts with the engine off. A technician in a forum noted a B3055 was accompanied by a battery reading only 10.5V.
   Typical fix: Charge or replace the vehicle battery. A battery charger should be connected during any key relearn procedure to ensure stable voltage.
   Est. part cost: $150-$300

Rare But Worth Checking

• Faulty Theft Deterrent Module (TDM) or Body Control Module (BCM): This is uncommon, but if all keys and the ignition cylinder have been ruled out, the module itself may have failed. In some cases, a temporary fix has been achieved by disconnecting the battery and the module to reset it, but this often points to an impending module failure. Replacement requires programming with a GM-specific scan tool.
• Wiring Harness or Connector Issues: A poor connection or broken wire between the ignition lock cylinder's exciter coil and the TDM can cause an intermittent or total loss of signal, triggering a B3055. This can be misdiagnosed as a faulty lock cylinder or TDM. A visual inspection of the harness and checking for continuity is required.

Diagnosis Steps

1. Check for a security light on the dash. If it's on or flashing, the issue is with the anti-theft system.
2. Remove all other keys, fobs, and RFID cards from the keychain and try starting the vehicle again.
3. Try starting the vehicle with a known-good spare key. If it starts, the primary key is faulty.
4. If using a flip key, ensure it is fully extended and locked straight before inserting it into the ignition.
5. Inspect the ignition key for any visible damage to the head or a broken blade.
6. Check the vehicle's main battery for proper voltage (12.6V+). Ensure terminals are clean and tight. Low voltage can cause this code.
7. Attempt the 30-Minute Key Relearn Procedure: Turn the key to 'ON' (do not start). The security light will be on. Wait approximately 10-11 minutes for the light to turn off. Turn the key 'OFF' for 10-30 seconds. Repeat this cycle two more times for a total of three cycles and 30+ minutes. After the third cycle, turn the key off, then try to start the engine.
8. If the above steps fail, the issue is likely the ignition lock cylinder's exciter coil, the wiring, or the Theft Deterrent Module itself, 🎬 Watch: How to replace the theft control module which requires professional diagnosis with a scan tool.

Parts You'll Likely Need

• Ignition Key with Transponder (PK3+) (OEM #ACDelco B111, Strattec 709271 (uncoded lock kit)) — The transponder chip inside the key is the most common point of failure for this code. Keys can be damaged or simply wear out.
  Trusted brands: ACDelco, Strattec
  OEM price range: $70-$120
  Aftermarket price range: $40-$80
• Ignition Lock Cylinder Housing with Passkey Sensor (OEM #ACDelco 25832354, GM 88965342, Dorman 924-796) — Contains the exciter coil that reads the key. If the coil or its wiring fails, no key will be detected. This part often fails rather than the mechanical lock cylinder itself.
  Trusted brands: ACDelco, Standard Motor Products, Dorman
  OEM price range: $150-$250
  Aftermarket price range: $80-$150

Related Codes That Often Appear With This One

• B3060 — This code, 'Unlearned Key Detected,' often appears with B3055 when the system sees a key signal but doesn't recognize it as valid, which can happen during a failed programming attempt or with a faulty key.
• B3935 — This code relates to 'Transponder Authentication Error' and can be set alongside B3055 during a communication failure between the key and the module.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank/no start with security light on and DTCs B3055, B3060, etc. It specifically warns against RFI from aftermarket devices like LED lights, phone chargers, and other RFID cards on the keychain.
• PIT5030E: Notes that an intermittent no-crank with DTC B3055 can occur if a flip-style key is not fully extended when inserted into the ignition, causing a poor reading angle.

Platform-Specific Known Issues

• An intermittent no-crank or start-stall condition can be caused by radio frequency interference from other devices on the keychain, as documented in TSB PIC5650M. This includes aftermarket LED lights and USB chargers plugged into the vehicle.
• For vehicles with a flip-style key, not having the key fully extended and locked straight can cause a poor connection in the ignition, leading to a B3055 code in history, as per TSB PIT5030E.

Mechanic-Grade Diagnostic Values

• Ignition Lock Cylinder Exciter Coil Resistance — expected: 5-15 Ohms. Failure: A reading of infinite resistance (open circuit) or very high resistance indicates a failed coil.
• BCM Ground Circuit Resistance — expected: Less than 10 ohms. Failure: Resistance greater than 10 ohms indicates a poor ground connection at G218 or a problem in the wiring harness.
• TDM/BCM Signal Circuit Voltage — expected: Less than 1 V with ignition ON, connector disconnected. Failure: Voltage significantly higher than 1V suggests a short to voltage in the harness.

Hidden / Shadow Codes Worth Checking

• B3055 00: The '00' is a symptom byte that typically means the base DTC text provides the full description, indicating a general 'No Transponder' or 'No Modulation' fault. This is the most common variant seen on professional scan tools. (see via GM GDS2 or Tech2 scan tools will display the main DTC followed by the two-digit symptom byte.)

Scan Tool Commands That Help

• GDS2 / Tech2: Immobilizer Learn — This function is required after replacing the BCM or ignition keys. It includes sub-menus for 'Module Setup' (for a new BCM) and 'Add/Replace Keys'.
• GDS2: Body Control Module > Data Display — Use this to monitor live data parameters like 'TDM Transponder Key State' (e.g., Present, Not Present, Invalid) to confirm if the module is seeing the key at all.
• GDS2: Clear All DTCs — After a repair, use this command to clear the B3055 code. If it returns immediately without a key cycle, it indicates a hard fault is still present.

Wiring & Ground Locations

• G218 — Behind the driver's side kick panel, near the A-pillar, mounted to the body.. This is the primary ground connection for the Body Control Module (BCM). A loose or corroded G218 ground can cause erratic BCM behavior, including false theft deterrent codes like B3055.
• Ignition Switch Connector — At the base of the ignition lock cylinder housing, inside the steering column shrouds.. The wires running from the exciter coil to the BCM can chafe or break due to the movement of a tilt steering column, causing an intermittent open circuit and a B3055 code. Inspecting this connector and the adjacent harness is a critical step if the key and lock cylinder housing are known to be good.
• Engine Wiring Harness (Driver's Side) — Near the ECM/TCM bracket, upper control arm, and shock tower in the driver's side wheel well area.. While less common for a B-code, severe engine harness chafing in this known problem area can cause shorts that affect various modules. If multiple unrelated electrical codes are present with B3055, this harness should be inspected.

Real Owner Repair Stories

• Tahoe Yukon Forum user (2007-2014 GMT900 platform vehicle) — Intermittent no-start, security light on, B3055 stored.
  ❌ Tried (didn't work) Trying a spare key, Performing the 30-minute key relearn procedure multiple times
  ✅ What actually fixed it The final fix was replacing the ignition lock cylinder housing (the part containing the exciter coil, P/N 25832354), not the mechanical key cylinder. The coil itself had failed.
• Automotive technician forum post (2008 Chevrolet Express (similar Passkey III+ system)) — No start, "Service Theft Deterrent System" message, B3055 code. Scan tool showed 'Transponder Key Not Present'.
  ❌ Tried (didn't work) 30-minute relearn procedure
  ✅ What actually fixed it The technician found a broken wire in the harness between the ignition switch and the BCM. Repairing the wire resolved the issue without replacing any components.
• YouTube Repair Channel (2015 Chevrolet Malibu (similar system logic)) — No crank, no start, security light on, DTC B3055.
  ❌ Tried (didn't work) Clearing codes (B3055 returned immediately)
  ✅ What actually fixed it The original key's transponder had failed. Programming a brand new key to the vehicle using a professional scan tool immediately fixed the problem. This confirmed the rest of the system (exciter coil, wiring, BCM) was functioning correctly.

OEM Part Supersession History

• ACDelco 25832354 → GM 84451937 — Standard part number update and inventory consolidation by GM.
  Heads up: The new part number is a direct replacement. However, be aware that this part is for the housing with the sensor coil only; it does not include the mechanical lock cylinder that matches your physical key.

Model Year Variations Within This Range

• 2007-2014: While the Pass-Key III+ system and the B3055 diagnostic procedure remained consistent, the specific part number for the Body Control Module (BCM) changed multiple times throughout this generation. When replacing a BCM, it is critical to use a part number that is compatible with the specific model year and options of the vehicle. A BCM from a 2008 may not work in a 2013 model.