B3055 on 2021-2025 Chevrolet Corvette: No Start & Security Light Causes

What's Unique About the 2021-2025 Chevrolet CORVETTE

The C8 Corvette utilizes GM's sophisticated Vehicle Intelligence Platform (Global A) electrical architecture, which includes a complex keyless start and passive entry system. This system's sensitivity can lead to intermittent communication issues between the key fob and the vehicle's modules. A GM Technical Service Bulletin (TSB) acknowledges that intermittent no-start conditions with security codes like B3055 can occur, sometimes due to Radio Frequency (RF) interference from other devices on the owner's keychain or aftermarket electronics inside the car. The system uses a 125 kHz frequency for key transponder communication, which can be susceptible to jamming from other RF devices.

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 stalls.
• Security indicator light is illuminated or flashing on the dashboard.
• "No Fob Detected" message on the driver information center.
• "Theft Attempted" message on the driver information center.
• Remote Keyless Entry (RKE) system is intermittently inoperative.
• Car gets stuck in accessory mode and will not fully power off.

Most Likely Causes

1. Radio Frequency (RF) Interference 🔴 High Probability As noted in multiple versions of GM service bulletin PIC5650, other RFID devices can 'jam' the signal. The immobilizer system operates at 125 kHz, and other devices operating in or near this frequency range can cause interference. Common culprits include other vehicle key fobs, building access cards, gas station payment fobs, toll passes, and even some aftermarket electronics like cell phone chargers or LED lights.
   How to confirm: Remove all other fobs, cards, and aftermarket electronic devices from the Corvette's key ring and from inside the vehicle. Try starting the vehicle again. If it starts consistently, RF interference was the likely cause. A technician can use an RFI meter to scan for interfering signals.
   Typical fix: Keep the Corvette key fob isolated from other RFID-emitting devices. Advise the customer to be aware of aftermarket electronics plugged into the car.
   Est. part cost: $0
2. Faulty Key Fob or Weak Fob Battery 🟡 Medium Probability → Shop Vehicle Battery
   How to confirm: First, replace the CR2450 battery in the key fob. 🎬 See this easy DIY key fob battery replacement guide If the problem persists, try using the vehicle's second key fob. If the second fob works reliably, the first fob is likely defective. A technician can use a scan tool to view the 'TDM Transponder Key' parameter, which should read 'Present' for a good key. If it reads 'Not Present' for only one key, that key is faulty.
   Typical fix: Replace the key fob battery or the entire key fob assembly if it's faulty. A new fob will require programming by a dealer or qualified locksmith using GM's Service Programming System (SPS).
   Est. part cost: $5-$15 for a battery, $250-$500 for a new fob.
3. Body Control Module (BCM) or Theft Deterrent Module (TDM) Issue 🟡 Medium Probability → Shop Anti-Theft Control Module The provided TSB #PIC5650M for the 2021-2025 Corvette specifically lists B3055 in the context of intermittent no-start conditions that may point to module issues. Some owners report intermittent no-start issues that resolve after a battery disconnect, pointing to a potential module glitch that requires a reset.
   How to confirm: This requires a professional scan tool (GDS2) to check for communication with the BCM/TDM and to monitor the key recognition data stream. If all available keys result in the 'TDM Transponder Key' parameter reading 'Not Present', the BCM/TDM itself is suspect. Diagnosis will follow the steps outlined in the relevant TSB.
   Typical fix: The fix can range from a software re-flash of the BCM to a complete replacement of the module. Replacement requires professional programming using GM's SPS2.
   Est. part cost: $500-$1200
4. Wiring or Connector Problem ⚪ Low Probability
   How to confirm: A visual inspection of the wiring and connectors at the BCM may reveal damage. A technician would use a multimeter to test for continuity, proper voltage, and resistance at the module's connectors, following a specific diagnostic procedure. For example, testing the low reference circuit end-to-end should show less than 2 Ω of resistance. A check of critical grounds, such as G201 at the base of the left 'A' pillar, is also necessary.
   Typical fix: Repairing the damaged section of the wiring harness or cleaning/replacing the faulty connector.
   Est. part cost: $20-$300 depending on the extent of the damage.

Diagnosis Steps

1. Check for an illuminated security light on the dashboard.
2. Try starting the car with your second key fob. If it works, the first fob is the problem.
3. Replace the battery (CR2450) in the non-working key fob.
4. Remove all other keys, cards, and electronic fobs from your keychain to eliminate RF interference. Also unplug any aftermarket chargers or devices inside the car.
5. If the vehicle still won't start, try placing the key fob in the designated transmitter pocket in the center console 🎬 Watch: How to start your C8 with a dead fob, which can sometimes allow the car to start even with a weak signal or interference.
6. If the vehicle is stuck in accessory mode, some owners have had success by disconnecting the main 12V battery for several minutes 🎬 Watch: How to unlock and charge a dead C8 battery to reset the modules.
7. Use an OBD-II scanner capable of reading BCM codes to confirm B3055 is present. A professional-level tool (like GM's GDS2) is needed to read detailed parameters.
8. With a capable scan tool, observe the 'TDM Transponder Key' parameter. It should read 'Present' when a valid key is used.
9. Check for any related Technical Service Bulletins (TSBs), such as the latest version of PIC5650 (e.g., PIC5650M).
10. If basic steps fail, professional diagnosis is required to test the BCM, wiring, and immobilizer antenna circuits. This includes checking for resistance on key circuits and verifying grounds like G201.

Parts You'll Likely Need

• Key Fob (OEM #13536982, 13545155, 13545167, 13554500) — The transponder inside the fob can fail, the battery can die, or the fob itself can be damaged, causing the B3055 code.
  Trusted brands: ACDelco, ILCO
  OEM price range: $250-$500
  Aftermarket price range: $50-$250
• Body Control Module (BCM) (OEM #13548775, 13546979) — The BCM is the central hub for the security system. Internal faults or software glitches can prevent it from recognizing a valid key.
  Trusted brands: ACDelco
  OEM price range: $500-$1200

Related Codes That Often Appear With This One

• B3060 — Also related to the key transponder system, often set with B3055.
• B3935 — Another transponder-related code indicating a security system authentication fault.
• C0750, C0755, C0760, C0765, C0775 — These are tire pressure monitor sensor codes, but are listed alongside B3055 in TSB #PIC5650M, suggesting a broader communication or BCM-related issue can trigger multiple, seemingly unrelated codes.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank, no start, or start stall concerns with the security light coming on. Lists DTCs B3055, B3060, B3935, and others. The primary diagnostic path is to investigate and eliminate sources of Radio Frequency Interference (RFI) from aftermarket devices or other items on the key ring.

Platform-Specific Known Issues

• A GM Technical Service Bulletin (TSB #PIC5650M) exists for 2021-2025 Corvettes that experience intermittent no-crank, no-start, or stalling with the security light on, specifically citing DTC B3055 among others. The bulletin primarily points towards diagnosing and eliminating sources of Radio Frequency Interference.
• Intermittent No-Start That Fixes Itself: Several owners on CorvetteForum have reported experiencing a no-start or no-crank condition that mysteriously resolves itself after waiting some time or after disconnecting and reconnecting the battery. This often happens without setting any persistent codes, making dealer diagnosis difficult.

Mechanic-Grade Diagnostic Values

• Immobilizer System Operating Frequency — expected: 125 kHz. Failure: This value is for reference when diagnosing Radio Frequency Interference (RFI). Other devices operating near 125 kHz can jam the signal.
• BCM Low Reference Circuit Resistance — expected: Less than 2 Ω. Failure: A reading of 2 Ω or greater indicates an open or high resistance in the circuit, which could be a broken wire or corroded connection.

Hidden / Shadow Codes Worth Checking

• B3055 00: The '00' is a symptom byte indicating 'No Sub Type Information'. This means the BCM has detected the general fault described by B3055 but is not providing a more specific reason (like a short to ground or open circuit). It's the most common and generic variant of the code. (see via A professional scan tool like GM's GDS2 that can read manufacturer-specific codes and their symptom bytes.)

Scan Tool Commands That Help

• GDS2 (GM Global Diagnostic System 2): Immobilizer System Component Programming — This function is required after replacing the Body Control Module (BCM). It uses the online Service Programming System (SPS) to configure the new module, write the VIN, and learn the security credentials of the vehicle.
• GDS2 (GM Global Diagnostic System 2): Data Display > BCM > Transponder Key Status — This live data parameter is used to quickly verify if the BCM is successfully reading a key. The value should change to 'Present' when a known-good key is placed in the transmitter pocket. If it remains 'Not Present' for all keys, it points towards a BCM, antenna, or wiring issue rather than a faulty key.
• GDS2 (GM Global Diagnostic System 2): Add/Replace Key Fobs — This function is used to program new or additional key fobs to the vehicle's BCM. All existing and new fobs must be present, as the procedure often erases all previously learned keys.

Wiring & Ground Locations

• K9 Body Control Module (BCM) — Inside the vehicle, located in the center console area, directly underneath the main infotainment radio module.. This is the central computer for the immobilizer system. All signals from the key fob and immobilizer antenna are processed here. Checking its connectors for security and corrosion is a key diagnostic step.
• G201 (Ground Point) — At the base of the left 'A' pillar, behind the interior trim panel.. The BCM and other interior modules rely on clean, secure ground points. A loose or corroded G201 can cause a variety of intermittent electrical issues, including communication faults that could trigger a B3055 code.
• Immobilizer Schematics — Digital; available via subscription.. Complete, official wiring diagrams for the C8 Corvette are necessary for advanced circuit testing (e.g., checking the immobilizer antenna circuits). These are available through a paid subscription to the ACDelco Technical Delivery System (TDS) website.