B3055 on 2022-2026 Chevrolet EXPRESS: No-Start Causes and Fixes

What's Unique About the 2022-2026 Chevrolet EXPRESS

The Chevrolet Express has used a variation of the Pass-Key III+ immobilizer system for many years. For the 2022-2026 models, this system is well-established. A key issue, highlighted in multiple revisions of GM Technical Service Bulletin #PIC5650 (up to PIC5650M), is an intermittent no-crank or start-stall condition linked to this code. The bulletin strongly advises technicians to investigate and eliminate sources of Radio Frequency Interference (RFI) from aftermarket accessories *before* replacing any parts, as this is a common cause of the communication failure.

Diagnostic Flowchart

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

Symptoms You May Notice

• Intermittent no-crank, no-start condition
• Engine starts but immediately stalls
• Security light is illuminated or flashing on the dashboard
• "Service Theft Deterrent System" message may appear on the driver information center.

Most Likely Causes

1. Defective or Damaged Ignition Key 🔴 High Probability The transponder chip embedded in the key head can be damaged from drops or wear over time, or its internal electronics can simply fail. This is a very common failure point for GM's Pass-Key system.
   How to confirm: The easiest way to confirm is to try starting the vehicle with a spare key. If the spare key works consistently, the original key is faulty. For flip-style keys, ensure the key is fully extended and locked straight, as a partially folded key can cause this code according to GM TSB PIT5030E.
   Typical fix: Replace the faulty key. A new key must be purchased from a dealer or locksmith and professionally programmed to the vehicle.
   Est. part cost: $75-$250
2. Faulty Ignition Lock Cylinder / Exciter Coil 🟡 Medium Probability The exciter coil (antenna) that reads the key's transponder is part of the ignition lock cylinder housing. This component can fail electrically, or the wiring connecting it can become loose or damaged from the rotational stress of turning the key, preventing it from energizing and reading the key.
   How to confirm: If multiple known-good keys fail to start the vehicle, the problem is likely in the reading mechanism. A technician can use a scan tool to check for a signal from the key reader and inspect the wiring at the steering column. Monitoring the 'TDM Transponder Key' data PID should show 'Not Present' if the reader is bad.
   Typical fix: Replace the ignition lock cylinder housing (which contains the coil) and perform a security relearn procedure.
   Est. part cost: $60-$350
3. Radio Frequency Interference (RFI) ⚪ Low Probability As noted in GM TSB PIC5650M, other electronic devices can 'jam' the 125 kHz signal between the key and the vehicle. The Express, being a commercial vehicle, is often equipped with aftermarket electronics that are prime sources of RFI. Examples include: aftermarket LED lighting, USB phone chargers, power inverters, toll passes, and even other vehicle keys on the same keychain.
   How to confirm: Remove all other keys, fobs, and electronic devices from the keychain and unplug any aftermarket chargers or accessories inside the van. Attempt to start the vehicle with the ignition key alone. If it starts, one of the removed items was causing interference.
   Typical fix: Keep sources of RFI away from the ignition key when starting the vehicle.
   Est. part cost: $0
4. Faulty Body Control Module (BCM) ⚪ Low Probability The BCM is the control center for the theft deterrent system. While robust, it can fail due to internal faults, voltage spikes, or water intrusion. A failing BCM on these vans often causes other strange, intermittent electrical issues simultaneously, such as erratic power locks, flickering lights, or malfunctioning wipers.
   How to confirm: This is typically a diagnosis of exclusion. If the key, ignition cylinder, and wiring have all been confirmed to be good and RFI has been ruled out, the BCM is the next logical suspect. A technician will need to perform advanced diagnostics on the BCM itself.
   Typical fix: Replace the Body Control Module and program it to the vehicle using specialized dealer equipment.
   Est. part cost: $400-$800

Rare But Worth Checking

• Damaged Wiring or Poor Connection: A broken or corroded wire in the harness between the ignition lock cylinder and the BCM can cause an intermittent B3055. This is often difficult to find and may mimic a faulty component. A user on Chevrolet Forum with an '09 Express reported this code after the steering column was torn apart, damaging the wiring.

Diagnosis Steps

1. Check for and document any other DTCs in all modules.
2. Try to start the vehicle with a known-good spare key. If it starts, the primary key is faulty.
3. Remove all other keys, fobs, and electronic devices from the keychain and unplug any aftermarket accessories (phone chargers, LED lights, etc.) from the vehicle to rule out Radio Frequency Interference (RFI).
4. If using a flip-style key, ensure it is fully extended and locked in the straight position before inserting it.
5. Inspect the ignition key for any visible damage.
6. If a spare key is not available or does not work, a security relearn procedure (often called the '30-minute relearn') can be attempted. This involves turning the key to 'ON' for 10-11 minutes until the security light goes out, then 'OFF' for 5-10 seconds, repeated three times in total. The engine should start after the third cycle.
7. Using a professional scan tool (like GM GDS2), monitor the data PIDs for the Theft Deterrent Module (TDM) / Body Control Module (BCM). Specifically, watch the 'TDM Transponder Key' parameter to see if it changes to 'Present' when a key is inserted.
8. Inspect the wiring and connectors at the ignition lock cylinder and the BCM for any signs of damage, corrosion, or loose pins, especially where the harness passes the tilt-steering mechanism.
9. If the key is good, RFI is ruled out, and wiring is intact, the fault is likely with the ignition lock cylinder/exciter coil or, lastly, the BCM itself.

Parts You'll Likely Need

• Transponder Ignition Key (OEM #Example: ACDelco B119-P (Verify fitment)) — This is the most common failure point. The transponder chip inside the key head fails, preventing it from communicating with the vehicle's security system.
  Trusted brands: ACDelco, Strattec
  OEM price range: $100-$200
  Aftermarket price range: $50-$120
• Ignition Lock Cylinder Housing (OEM #Examples: ACDelco D1411G, Dorman 924-713 (Verify fitment)) — This component contains the exciter coil (antenna) that reads the key. If this coil fails, no key will be recognized. It is the second most likely part to fail.
  Trusted brands: ACDelco, Dorman
  OEM price range: $150-$350
  Aftermarket price range: $60-$150

Related Codes That Often Appear With This One

• B3060 — This code for 'Unspecified Key' or 'Unprogrammed Transponder' is often set with B3055 as they both relate to the BCM's inability to identify the key transponder. It is also mentioned in TSB #PIC5650M.
• B3935 — Indicates a 'Transponder Authentication Error'. This means the key was detected but its security code was incorrect. It frequently appears with B3055 and is also cited in TSB #PIC5650M.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses an intermittent no crank/no start or start/stall with security light on, citing B3055 and emphasizing RFI checks.

Platform-Specific Known Issues

• TSB #PIC5650M directly addresses an intermittent no crank, no start, or start/stall concern with the security light on, specifically citing B3055. It places a strong emphasis on ruling out Radio Frequency Interference from aftermarket accessories before replacing parts.
• A related TSB for other GM vehicles (PIT5030E) notes that flip-style keys not fully extended can cause a B3055. If your Express has a flip key, this is a simple but important check.

Mechanic-Grade Diagnostic Values

• Voltage on Signal Circuit at BCM Connector — expected: < 1.0 V. Failure: Voltage greater than 1.0 V indicates a short to voltage in the wiring harness between the BCM and the ignition lock cylinder housing.
• Resistance of TDM/BCM ground circuit to chassis ground — expected: Less than 10 ohms. Failure: A value greater than 10 ohms indicates an open or high resistance in the ground circuit.
• Scan Tool Live Data: TDM Transponder Key Parameter — expected: Present. Failure: Parameter reads 'Not Present' when a key is in the ignition and turned to ON, indicating the TDM is not seeing the key.

Scan Tool Commands That Help

• GM GDS2 or equivalent: Read Fault Codes after holding new key near ignition — If the original key sets only B3055, holding a new (unprogrammed) key near the ignition while cycling it may cause a new code like B3935 ('Transponder Authentication Error') to appear. This helps confirm the vehicle's reader is working but doesn't recognize the original key, strongly suggesting the original key is bad.
• GM GDS2: Module Diagnostics -> Body Control Module -> Control Functions — This allows a technician to perform bidirectional controls to test various BCM-controlled subsystems. While not a direct test for B3055, it can help determine if the BCM is responsive and functioning for other tasks, which can be useful when suspecting a complete BCM failure.

Wiring & Ground Locations

• Body Control Module (BCM) — Located behind the knee bolster on the right (passenger) side of the dashboard.. The BCM is the central module for the Pass-Key III+ system. All wiring from the ignition lock cylinder's transponder reader terminates here.
• BCM Connector X1 — This is one of the seven plugs on the BCM. It is a 27-way, light green connector (OEM #15482789).. Connector X1 contains several critical circuits for the anti-theft system. Specifically, Pin 2 (Pink) is Ignition Voltage, Pin 4 (White) is part of the transponder circuit, and Pin 14 (Pink) is another Ignition Voltage feed.
• BCM Connector X4 — Another of the seven plugs on the BCM.. Pin 9 on connector X4 is a Black with White stripe wire that serves as a ground for the BCM. A poor connection at this pin can cause various BCM-related faults, including security system errors.
• Grounds G103, G104, G105, G106 — These are primary underhood ground points. G103 is at the rear of the left-hand engine head. G104, G105, and G106 are also under the hood, often near the original battery location.. A TSB regarding electrical issues on Express/Savana vans with relocated batteries highlights the critical importance of these grounds. Improper grounding can cause a host of issues, including DTCs from various modules. Ensuring these are clean and tight is a crucial step in diagnosing any electrical fault.

Real Owner Repair Stories

• YouTube channel 'NoNonsenseKnowHow' (2018 Chevy Express) — Check engine light on, code for 'no ignition voltage to the Chassis Control Module (CCM)'. While not a B3055, the diagnostic process is highly relevant.
  ❌ Tried (didn't work) Checking the fuse for the CCM, which was found to be good., Testing for power at the CCM connector, which showed 0 volts on the ignition-on signal wire.
  ✅ What actually fixed it The technician located the wiring harness near the underhood fuse block and found a broken pink wire inside the loom. After pulling on the wire, it came apart completely. Repairing this single broken wire restored power to the module and fixed the issue. This highlights how a single point of failure in the wiring, not a component, can be the root cause.