B3055 on 2008-2012 GMC Yukon Hybrid: No Start, Security Light Causes & Fixes

What's Unique About the 2008-2012 Gmc YUKON HYBRID

The GMT900 platform, which includes this generation of Yukon, uses the Passkey III+ (PK3+) immobilizer system. This system is notoriously sensitive to intermittent faults, particularly from Radio Frequency Interference (RFI). GM has issued multiple Technical Service Bulletins, including PIC5650M, that specifically address intermittent no-start conditions with code B3055 on these trucks, often pointing to RFI from aftermarket devices like phone chargers, USB power banks, or even toll passes before suspecting major component failure. [NHTSA]

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 (no-crank).
• Engine starts and immediately stalls.
• Security light is illuminated or flashing on the instrument cluster.
• "Service Theft Deterrent System" message on the Driver Information Center (DIC).

Most Likely Causes

1. Radio Frequency Interference (RFI) 🔴 High Probability The Passkey III+ system is sensitive to external radio signals operating near its 125 kHz frequency. TSB PIC5650M specifically calls out RFI as a primary cause for intermittent no-starts with code B3055, citing aftermarket phone chargers, dash cams, and even other RFID cards on the keychain as common culprits. [NHTSA]
   How to confirm: Remove all aftermarket devices (phone chargers, dash cams, USB cables), other keys, and RFID cards from the keychain and the vehicle's interior. If the vehicle starts consistently after removing these items, RFI was the cause.
   Typical fix: Identify and remove the interfering device. Replace low-quality aftermarket electronics with higher-quality, properly shielded ones.
   Est. part cost: $0
2. Damaged or Defective Ignition Key 🟡 Medium Probability The transponder chip in the key head can be damaged from being dropped or from normal wear and tear, causing it to stop transmitting its code. The key blade itself is often stamped with 'PK3' to identify the system.
   How to confirm: Try starting the vehicle with a known-good spare key. If the spare key works consistently, the original key is faulty.
   Typical fix: Replace the defective key. A new key (e.g., Strattec 5924133 or equivalent PK3+ blank) must be cut to match and then all keys must be programmed to the vehicle using a scan tool or the 30-minute relearn procedure.
   Est. part cost: $70-$150
3. Faulty Ignition Lock Cylinder / Exciter Ring 🟡 Medium Probability The ignition lock cylinder housing contains the exciter coil (antenna) that powers the key's transponder. Fine wires in this coil can break from wear, especially from repeated use of the tilt steering column, leading to an inability to read any key.
   How to confirm: If multiple known-good keys fail to start the vehicle and RFI has been ruled out, the lock cylinder is the next likely suspect. A technician can test the circuit for continuity and resistance; similar GM coils often measure between 10-15 Ohms.
   Typical fix: Replace the ignition lock cylinder housing (e.g., ACDelco D1462G or OEM Part No. 25832354) and perform the security relearn procedure. The Dorman 924-796 is a common aftermarket assembly that includes the cylinder and new keys.
   Est. part cost: $70-$200
4. Switchblade Key Not Fully Extended ⚪ Low Probability On models with a folding or 'switchblade' key, if the key is not fully locked in the straight position, it may be misaligned with the exciter ring, preventing a proper read. This is documented in TSB PIT5030E, which notes this can set a history code for B3055.
   How to confirm: Ensure the key is fully extended and locked straight. Remove the key, lock it in the open position, and re-insert it into the ignition.
   Typical fix: Educate the driver on the proper use of the key. No parts are required.
   Est. part cost: $0

Rare But Worth Checking

• Faulty Body Control Module (BCM) or Theft Deterrent Module (TDM): These modules are the computers that manage the security system. While they can fail, they are far less common than key, RFI, or lock cylinder issues. This should be considered a last resort after all other causes are ruled out by a professional using a scan tool to check for internal module faults.
• Low Vehicle Battery Voltage: A very weak main vehicle battery (below 12.2V) can cause various electronic modules, including the BCM/TDM, to malfunction and set erroneous codes. Always ensure the battery is fully charged and connected to a battery charger before attempting diagnostic procedures like the 30-minute relearn.
• Poor BCM/TDM Ground Connection: A loose or corroded ground connection for the Body Control Module can cause intermittent communication failures and trigger a B3055 code. On similar platforms, ground G103 (located on the cowl) has been identified as a potential source of such issues.

Diagnosis Steps

1. Check for and document all active and history DTCs, including symptom bytes if your scan tool supports it (e.g., B3055 5A).
2. Question the driver about symptoms. Ask if any new electronics have been added to the vehicle recently (phone chargers, dash cams, etc.).
3. Remove ALL items from the keychain except the single ignition key. Unplug all aftermarket devices from power outlets. Attempt to start the vehicle.
4. If the vehicle still won't start, try a known-good spare key. If the spare key works, the primary key is faulty.
5. If using a switchblade-style key, ensure it is fully extended and locked straight before inserting it into the ignition, per TSB PIT5030E.
6. Attempt the 30-minute security relearn procedure. Connect a battery charger. Turn the key to 'ON,' wait for the security light to turn off (approx. 10-11 mins), turn the key 'OFF' for 30 seconds. Repeat this two more times for a total of three cycles. On the fourth attempt, the vehicle should start. Note: This will erase any keys not present during the procedure.
7. If the relearn fails and multiple keys do not work, inspect the wiring and connector at the ignition lock cylinder for damage or corrosion.
8. If wiring is intact, the most likely cause is a faulty ignition lock cylinder/exciter ring. Replacement is the next step. Forum users report that if the 30-minute relearn fails, the hardware is almost always the cause.
9. If all the above steps fail, the issue may be a faulty BCM or TDM, which requires professional diagnosis with advanced scan tools to monitor immobilizer data PIDs.

Parts You'll Likely Need

• Ignition Key (OEM #Strattec 5924133 (PK3+ Blank)) — The transponder chip inside the key is often the point of failure. This is the most common part to replace after ruling out interference.
  Trusted brands: ACDelco, Strattec
  OEM price range: $70-$120
  Aftermarket price range: $40-$80
• Ignition Lock Cylinder Housing (OEM #25832354) — This housing contains the exciter ring (antenna) that reads the key's transponder chip. The fine wires in the ring can break over time, causing it to fail to read any key.
  Trusted brands: ACDelco, Dorman
  OEM price range: $100-$180
  Aftermarket price range: $70-$130

Related Codes That Often Appear With This One

• B3060 — This code for 'Unprogrammed Transponder Key' often appears with B3055 as they both relate to a failure in the key identification process and are cited together in TSBs. [9, NHTSA]
• B3935 — Meaning 'Transponder Key Authentication Error,' this is another related security code that can be set when the key's signal is not properly validated by the module. [NHTSA]
• C0750, C0755, C0760, C0765, C0775 — These tire pressure monitor sensor codes were cited along with B3055 in TSB #PIC5650M, suggesting a potential link through shared module logic or wiring, or simultaneous failure due to a broader electrical issue like RFI or low voltage. [NHTSA]
• B3055 5A — This is a more specific version of the code indicating a 'Plausibility Failure'. It means a signal was received, but it was corrupt or illogical, often pointing directly to strong RFI as the cause.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank, no start, or start/stall with security light on, specifically mentioning DTC B3055 and pointing to RFI as a likely cause from aftermarket electronics.
• PIT5030E: Notes that for vehicles with a flip-style key, an intermittent no-start can occur if the key is not fully extended and locked, which can set a history code for B3055.

Platform-Specific Known Issues

• An intermittent no-crank or start-and-stall condition with the security light on is a known issue for this platform, as documented in TSB #PIC5650M. The bulletin strongly advises checking for Radio Frequency Interference (RFI) before replacing any components.
• TSB #PIT5030E specifically addresses the issue on vehicles with flip-style keys, noting that if the key is not fully locked in the open position, it can cause an intermittent B3055.

Hidden / Shadow Codes Worth Checking

• B3055 00: No Sub Type Information. This is a common variant indicating the BCM received no signal at all from the key's transponder chip. (see via GM GDS2 or other professional-grade scan tools that can read manufacturer-specific symptom bytes.)
• B3055 5A: Plausibility Failure. This means the BCM received a signal, but it was corrupt, illogical, or invalid. This often points to strong Radio Frequency Interference (RFI) or an intermittent failure of the chip inside the key. (see via GM GDS2 or other professional-grade scan tools.)

Scan Tool Commands That Help

• GDS2/Tech2: BCM/TDM Data Display > Immobilizer Data — Use this to monitor live data PIDs like 'Transponder Key State' or 'Environment Identification (Key Detected)'. When a valid key is turned, the state should change. If it remains 'Not Present' or 'No Key Detected' with multiple good keys, it points strongly to a failed exciter coil in the ignition lock cylinder.
• GDS2/SPS (Service Programming System): Immobilizer Learn / Add/Replace Keys — This function is required to program new keys to the vehicle after a key or BCM/TDM has been replaced. It is the dealer-level alternative to the 30-minute manual relearn procedure.

Wiring & Ground Locations

• Body Control Module (BCM) — Inside the passenger cabin, located to the lower left of the steering column, behind the driver's side lower dash panel. It is often integrated with or attached to the interior fuse block.. The BCM is the primary computer that manages the Passkey III+ anti-theft system. All signals from the ignition key's transponder are processed here. A poor connection or faulty ground at the BCM can cause a B3055 code.
• BCM Ground — On GMT900 trucks, a primary BCM ground path runs through the left instrument panel junction block. A key ground point to inspect is G218, located behind the driver's side kick panel.. A loose or corroded BCM ground can cause intermittent or total failure of the anti-theft system, leading to a B3055 code. GM issued a bulletin (07-08-47-004D) warning that removing a BCM ground while the battery is connected can damage the module.
• BCM Connectors — The BCM has multiple large, multi-colored connectors (often designated X1 through X7). The Class 2 Serial Data wire, which communicates security information, is typically a light green wire in Pin B1 of the C1 connector on similar platforms.. A pushed-out pin or corrosion in one of the main BCM connectors can interrupt the signal from the ignition cylinder's exciter coil or prevent the BCM from communicating with other modules, triggering the code.

Real Owner Repair Stories

• YouTube channel 'ADD AUTOMOBILE SERVICES' (2013 Chevrolet Equinox (similar GM immobilizer system)) — Intermittent no-start with security light on, code B3055 present.
  ❌ Tried (didn't work) Using the original key, which would sometimes work and sometimes fail.
  ✅ What actually fixed it A technician used a specialized tool (VVDI Key Tool) to clone the data from the intermittently failing original transponder chip onto a new 'super chip', which resolved the issue. This confirms the internal transponder chip was the point of failure.
• YouTube channel, vehicle not specified but shows common GM parts (GM vehicle with B3055) — No-start, security light on.
  ❌ Tried (didn't work) The post focused on direct diagnosis rather than listing failed parts.
  ✅ What actually fixed it The confirmed fix was replacing the ignition lock cylinder housing, which contains the transponder exciter coil. The vehicle started and the code was resolved after replacement.

OEM Part Supersession History

• 12458191, 12533953, 15822350, 19168637 → 25832354 — Part consolidation and revision over time for the ignition lock cylinder housing.
  Heads up: While these part numbers are listed as being replaced by 25832354, always verify fitment with the vehicle's VIN. This part requires programming/relearn procedures after installation.