B3060 on 2007-2009 GMC Envoy: Security Fault, No-Start Causes and Fixes

What's Unique About the 2007-2009 Gmc ENVOY

The 2007-2009 GMC Envoy is part of the GMT360 platform, which also includes the Chevrolet TrailBlazer, Buick Rainier, Isuzu Ascender, and Saab 9-7X. These vehicles all share the same GM Passkey III+ (PK3+) anti-theft system that relies on a transponder chip in the key communicating with a reader coil around the ignition cylinder. This system is notoriously sensitive, and intermittent no-start issues are common enough that GM has issued a long-running Technical Service Bulletin (TSB #PIC5650M) that covers this exact vehicle and code, pointing to security system faults and Radio Frequency Interference (RFI).

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
• Engine starts and immediately stalls
• Security light is illuminated or flashing on the dashboard
• Intermittent no-start condition that may seem to resolve itself temporarily
• Key is difficult to turn or gets stuck in the ignition cylinder

Most Likely Causes

1. Faulty Ignition Lock Cylinder / Exciter Coil 🔴 High Probability The exciter coil that reads the key's transponder chip is integrated into the ignition lock cylinder housing. This component is a known weak point across the entire GMT360 platform and can fail from wear and tear of internal contacts, causing it to no longer read the key correctly.
   How to confirm: Gently wiggling the key while in the 'ON' position may cause the security light to flicker or allow the vehicle to start, indicating a poor connection within the lock cylinder assembly. A professional scan tool can also monitor the 'TDM Valid Key' data parameter to see if the module is receiving a signal. If the 30-minute relearn procedure provides only a temporary fix, the cylinder is almost certainly the cause.
   Typical fix: Replace the ignition lock cylinder housing. After replacement, a 30-minute security relearn procedure must be performed to sync the existing keys to the new component.
   Est. part cost: $80-$250
2. Security System Lost Synchronization 🟡 Medium Probability Voltage fluctuations, such as from a weak or recently replaced battery, can sometimes cause the Theft Deterrent Module to lose its memory of the programmed keys.
   How to confirm: The issue appears suddenly, often after a battery-related event. Performing the 30-minute key relearn procedure will resolve the issue if this is the only cause.
   Typical fix: Perform the 30-minute key relearn procedure. This involves cycling the key to the 'ON' position and waiting for the security light to turn off, repeated three times for a total of about 30 minutes.
   Est. part cost: $0
3. Radio Frequency Interference (RFI) 🟡 Medium Probability As noted in multiple versions of GM TSB #PIC5650, the low-power signal from the key's transponder can be disrupted by other keys, fobs, access cards, aftermarket LED lights, or even aftermarket electronics like phone chargers plugged into the vehicle.
   How to confirm: Remove all other keys, fobs, and electronic devices from the keychain and from inside the vehicle. If the vehicle starts normally with just the single Envoy key, RFI was the cause.
   Typical fix: Keep the ignition key isolated from other electronic devices when starting the vehicle.
   Est. part cost: $0
4. Damaged or Faulty Key ⚪ Low Probability The transponder chip embedded in the key head can be damaged from being dropped or from internal electronic failure over time.
   How to confirm: Try starting the vehicle with a known-good spare key. If the spare key works without issue, the original key is faulty.
   Typical fix: The faulty key must be replaced. A new key will need to be cut and then programmed to the vehicle using the security relearn procedure or by a locksmith/dealer.
   Est. part cost: $50-$150

Rare But Worth Checking

• Damaged Wiring: The wiring harness connecting the ignition lock cylinder to the BCM can become chafed or damaged within the steering column, leading to an intermittent connection. This is often found in the flexible boot between the liftgate and body on these SUVs, which can cause other seemingly unrelated electrical issues that may affect BCM stability.
• Faulty Body Control Module (BCM): While rare, the BCM itself can fail. This is typically the last item to suspect after all other causes have been ruled out. In one documented case, a vehicle with a persistent B3060 required a BCM replacement and reprogramming after a new lock cylinder did not fix the issue. This is a costly repair and requires professional programming.

Diagnosis Steps

1. Verify the security light is on or flashing when the no-start condition occurs.
2. Scan the Body Control Module (BCM) for codes to confirm B3060 and check for others like B3055 or B3935.
3. Remove all other keys, fobs, and RFID cards from the keychain to eliminate Radio Frequency Interference (RFI) as suggested by GM TSB PIC5650M.
4. Attempt to start the vehicle with a known-good spare key. If it works, the primary key is faulty.
5. Ensure the vehicle battery is fully charged (above 12.4V) and connections are clean. A weak battery can cause the relearn procedure to fail.
6. Attempt the 30-Minute Security Relearn Procedure: Turn the key to 'ON' (engine off) and wait ~10 minutes for the security light to go out. Turn the key 'OFF' for 10 seconds. Repeat this process two more times for a total of three cycles. On the final attempt, try to start the engine.
7. If the relearn fails or the fix is temporary, the ignition lock cylinder/exciter coil is the most likely failed component.
8. Inspect the wiring and connector at the ignition lock cylinder for visible damage. Also, check the wiring boot in the liftgate for broken wires, a common issue on GMT360s that can cause various electrical gremlins.
9. If a new lock cylinder does not solve the problem, professional diagnosis of the Body Control Module (BCM) is required.

Parts You'll Likely Need

• Ignition Lock Cylinder Housing (OEM #ACDelco D1493F (Supersedes 15822350, 25832354)) — This is the most common failure point for a B3060 code on this platform, as it contains the Passkey sensor/exciter coil that reads the key's transponder chip.
  Trusted brands: ACDelco, Dorman (p/n 924-719), Standard Motor Products (p/n US614L)
  OEM price range: $150-$250
  Aftermarket price range: $80-$150
• Transponder Ignition Key — If a spare key works and the original does not, the transponder chip in the original key has failed.
  Trusted brands: ACDelco
  OEM price range: $60-$100
  Aftermarket price range: $30-$50

Related Codes That Often Appear With This One

• B3055 — This code means 'No Transponder Modulation or No Transponder,' indicating the system received no signal at all. It often appears with B3060 as the root causes (bad key, faulty reader coil, RFI) are identical.
• B3935 — This code for 'Transponder Authentication Failed' also points to a failure in the security handshake process and is often logged alongside B3060 during the same fault event, as noted in TSB PIC5650.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank, no start, or start/stall concerns with the security light on and DTCs B3055, B3060, B3935, and others. It specifically calls out Radio Frequency Interference (RFI) from other devices on the key ring or in the vehicle as a primary diagnostic step.

Platform-Specific Known Issues

• GM Technical Service Bulletin #PIC5650M (and its subsequent revisions like G) directly addresses intermittent no-crank/no-start conditions with security codes including B3060 on 2007-2009 GMC Envoy models, pointing towards security system faults and potential RFI from aftermarket electronics or even other fobs on the keychain.
• Owners on forums like GMTNation.com frequently report this exact issue. A common real-world experience is that the 30-minute relearn works for a short time (days or weeks) before the problem returns, confirming the ignition lock cylinder is failing and needs replacement.
• The wiring harness passing through the rubber boot to the rear liftgate is a known weak point on all GMT360 SUVs. Broken wires here can cause a host of electrical problems, including issues with the Liftgate Control Module (LGM) that can potentially destabilize the data bus and contribute to intermittent security faults.

Mechanic-Grade Diagnostic Values

• Passkey III+ Signal — expected: The Passkey III+ system does not use a simple resistance value like older Passlock systems. It uses an RF transponder. Diagnosis relies on a scan tool monitoring BCM data, not a multimeter.. Failure: A scan tool showing 'Invalid Key' or no change in status when the key is turned indicates a failure in the key, the exciter coil (in the lock cylinder), or the wiring.
• Vehicle Battery Voltage — expected: 12.4V or higher with engine off. 13.7V to 14.7V with engine running.. Failure: Low voltage can cause the security relearn procedure to fail or cause the BCM to lose key memory.

Scan Tool Commands That Help

• GM Tech2 / GDS2: BCM Live Data > Security Data — This is the primary diagnostic step to determine what the Theft Deterrent Module (TDM) is seeing. Monitor parameters like 'TDM State', 'Key Status', or 'Immobilizer Status' to see if the system recognizes a key as valid, invalid, or sees no key at all. This differentiates a bad key from a bad reader coil.
• GM Tech2 / GDS2: Body Control Module > Special Functions > Program New Key(s) — This function is used after replacing a key or the BCM. It guides the technician through the security relearn procedure required to add new keys to the vehicle's memory. All existing keys will be erased during this process.

Wiring & Ground Locations

• BCM C2 Connector — The Body Control Module (BCM) is located under the rear passenger-side seat. The C2 connector is a 32-pin connector, often light gray.. This connector contains the wiring from the ignition lock cylinder's exciter coil. Specifically, Pin A5 (Purple wire) and Pin B6 (Yellow wire) are for the Passkey III+ signal. Checking for continuity and voltage on these wires between the BCM and the steering column is a key diagnostic step for a suspected wiring issue.
• G203 Ground — Located on the left side of the instrument panel support, typically behind the driver's side kick panel.. This is a major interior ground point for multiple modules, including the BCM. A loose or corroded G203 can cause intermittent and difficult-to-diagnose BCM issues, including security system faults.
• Ignition Switch Connector — Located on the steering column, connected to the ignition lock cylinder housing.. This is the first point of connection for the exciter coil wiring. Damage or corrosion here can prevent the signal from ever reaching the BCM. Inspecting this connector is crucial when replacing the lock cylinder.

Real Owner Repair Stories

• Forum user reports on GMTNation.com (2007-2009 GMC Envoy / Chevrolet Trailblazer) — Intermittent no-start with security light on. 30-minute relearn works for a few days or weeks, then the problem returns.
  ❌ Tried (didn't work) Repeated 30-minute relearn procedures, Replacing the battery
  ✅ What actually fixed it Replacement of the ignition lock cylinder housing (ACDelco P/N D1493F) followed by a final 30-minute relearn procedure.
• Forum user report on Trailvoy.com (2008 Chevrolet Trailblazer) — Persistent B3060, no-start condition, security light illuminated.
  ❌ Tried (didn't work) Replacing the ignition lock cylinder, 30-minute relearn procedure, Checking fuses
  ✅ What actually fixed it The problem was finally traced to a corroded main engine-to-chassis ground strap and a poor connection at the BCM ground point (G203). Cleaning both ground connection points to bare metal resolved the issue permanently.
• Professional mechanic diagnostic case (2007 GMC Envoy) — B3060 code, no-start, security light on. Problem was intermittent and seemed to occur more often on hot days.
  ❌ Tried (didn't work) Replacing ignition lock cylinder, Replacing ignition key, Verifying wiring continuity between lock cylinder and BCM
  ✅ What actually fixed it The Body Control Module (BCM) was failing internally due to thermal stress. When the interior of the vehicle got hot, a solder joint or component inside the BCM would fail, causing the security fault. Replacing and reprogramming the BCM was the final fix.

When the Usual Fixes Don't Work

• While the ignition lock cylinder is the most common cause, it is not the only one. There are multiple documented cases in owner forums where replacing the lock cylinder did not fix the B3060 code. In these instances, the root cause was often found to be a corroded ground connection (specifically the BCM ground G203 or the main engine ground strap) or, in rarer cases, a faulty ignition switch (the separate electrical component) or a failing BCM itself. Always check grounds before replacing an expensive BCM.

OEM Part Supersession History

• 15822350, 25832354 → ACDelco D1493F — Part consolidation and minor revisions by the manufacturer.
  Heads up: While functionally the same, forum users strongly recommend using the genuine ACDelco part or a high-quality aftermarket equivalent (Dorman, Standard Motor Products) as cheap, unbranded lock cylinders are known to have a high failure rate out of the box.