B3060 on 2018-2025 GMC Terrain: Security System Fault, Causes and Fixes

What's Unique About the 2018-2025 Gmc TERRAIN

On the 2018-2025 GMC Terrain, the anti-theft system is deeply integrated with the Body Control Module (BCM) and the instrument cluster. Unlike older systems, a simple mechanical key will not work; the electronic transponder chip in the key must be correctly programmed and authenticated by the BCM to allow the engine to start. This generation is also susceptible to radio frequency (RF) interference from other devices on the keychain, which can block the key's signal and trigger this code intermittently, a condition noted in GM service bulletins. The BCM on this platform manages a wide array of functions, and a failure can cause seemingly unrelated electrical issues alongside the no-start condition.

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 immediately shuts off.
• Security indicator light is illuminated or flashing on the instrument cluster.
• "No Fob Detected" message on the Driver Information Center (for vehicles with keyless start).
• "Service Theft Deterrent System" message on the DIC.

Most Likely Causes

1. Using an Unprogrammed or Incorrect Key 🔴 High Probability This occurs any time a new key is cut but not electronically programmed to the vehicle, or if a key from another vehicle is used. The BCM will detect the transponder's value but will not find it in its memory of learned keys.
   How to confirm: Try starting the vehicle with all available keys. If another key works, the problematic key is either faulty or not programmed. A scan tool can also confirm if the key's part number is recognized by the BCM.
   Typical fix: The unprogrammed key needs to be programmed to the vehicle using a specific key relearn procedure or by a dealer/locksmith with the proper tools.
   Est. part cost: $0-$150
2. Radio Frequency (RF) Interference 🟡 Medium Probability As noted in GM Technical Service Bulletin PIC5650M, devices like toll passes, other car key fobs, or access cards on the same keychain can interfere with the 125 kHz signal from the key's transponder. The customer may unknowingly remove the interfering device before bringing the vehicle for service, making the issue hard to duplicate.
   How to confirm: Remove all other fobs, cards, and electronic devices from the keychain so only the single GMC key is present. Attempt to start the vehicle. If it starts, interference was the cause.
   Typical fix: Keep other RFID-emitting devices separate from the vehicle's key when starting the engine. GM advises dealers to direct customers to the 'Radio Frequency Statement' section of their owner's manual.
   Est. part cost: $0
3. Faulty or Damaged Key Transponder 🟡 Medium Probability The electronic chip inside the key head can be damaged from being dropped, getting wet, or from age.
   How to confirm: If the vehicle fails to start with one key but starts and runs normally with a spare key, the first key's transponder is likely bad.
   Typical fix: The faulty key must be replaced and the new key programmed to the vehicle.
   Est. part cost: $75-$250
4. Failing Body Control Module (BCM) ⚪ Low Probability → Shop Body Control Module The BCM is the computer that manages the anti-theft system. It can fail due to internal circuit faults, voltage spikes, or water damage. A failing BCM can cause a host of erratic electrical issues, such as lights flickering, power locks acting on their own, or multiple unrelated warning lights appearing on the dash.
   How to confirm: This is a complex diagnosis. A professional scan tool is needed to check for communication errors (U-codes) with the BCM. Other seemingly unrelated electrical issues (erratic lights, windows, parasitic battery drain) are often a sign of BCM failure.
   Typical fix: The BCM must be replaced and programmed to the vehicle's VIN by a dealer or qualified shop.
   Est. part cost: $300-$700

Rare But Worth Checking

• Faulty Ignition Lock Cylinder/Antenna: → Shop Ignition Switch The exciter coil (antenna) that surrounds the ignition lock cylinder energizes the key's transponder. If this coil fails, it cannot read the key, even if the key is good. This is less common than key or interference issues.

Diagnosis Steps

1. Verify the battery is fully charged and connections are clean and tight. A battery charger is recommended during diagnosis to ensure stable voltage.
2. Check for any Technical Service Bulletins (TSBs) related to the anti-theft system for your specific VIN. TSB PIC5650M is highly relevant.
3. Isolate the key. Remove all other keys, fobs, and RFID cards from the keychain and try starting the vehicle with just the primary key to rule out RF interference.
4. Try starting the vehicle with a known-good spare key. If it starts, the issue is with the first key.
5. If no keys work, attempt the "30-Minute Key Relearn Procedure". This involves turning the key to 'ON' for 10 minutes (or until the security light goes out), turning it 'OFF' for 5-10 seconds, and repeating this cycle a total of three times. The vehicle learns the key on the next ignition cycle after the procedure.
6. Using a professional scan tool, check the status of the Body Control Module (BCM) and view the 'BCM Key Part Number' or 'TDM Valid Key' parameter to see if it recognizes the key.
7. Inspect the wiring and connectors at the BCM and around the ignition lock cylinder for any signs of damage or corrosion.
8. If all else fails, diagnosis by a qualified technician is recommended to test the BCM and other security system components. A failing BCM may not communicate with the scan tool at all.

Parts You'll Likely Need

• Ignition Key with Transponder (OEM #13584502 (5-Button), 13591388 (3-Button), 13508276) — This is the most common fix when the original key's internal transponder chip has failed or the key is lost. Part numbers vary based on button configuration (e.g., remote start, power liftgate).
  Trusted brands: ACDelco, Strattec
  OEM price range: $100-$210
  Aftermarket price range: $50-$120
• Body Control Module (BCM) (OEM #13522387, 13519672, 13524922) — In less common cases, the BCM itself is the point of failure, preventing it from recognizing a valid key. Replacement requires professional programming to the vehicle's VIN.
  Trusted brands: ACDelco (Bosch is an OEM supplier)
  OEM price range: $300-$500
  Aftermarket price range: $200-$400

Related Codes That Often Appear With This One

• B3055 — This code relates to a problem with the key transponder itself (No Transponder Modulation or No Transponder). It often appears with B3060 when the key is damaged, faulty, or there is heavy interference.
• B3935 — This code indicates a transponder authentication error, which is a similar security system fault and can be triggered by the same conditions as B3060.
• U1962 — On newer GM platforms, this code indicates a 'Serial Data Authentication Configuration' failure. This is a security handshake between modules. If it fails after programming a new module (like a BCM), it can prevent the key relearn procedure from completing, thus indirectly causing a B3060.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank, no start, or start/stall with security light on, potentially caused by DTC B3060, B3055, or B3935. It highlights radio frequency interference from other devices on the keychain as a primary cause to investigate and advises checking for RFID devices.
• PIE0232: An engineering information bulletin for early-build 2013 models (different platform, but same codes) requesting data on low-mileage vehicles with B3055/B3060 to determine the root cause, showing it was a known issue.

Platform-Specific Known Issues

• Intermittent no-start conditions caused by Radio Frequency Interference (RFI) from devices on the owner's keychain are a known issue addressed by GM TSB PIC5650M.
• The DIY 30-minute relearn procedure can be sensitive to battery voltage. Some owners report needing multiple attempts for it to succeed, and a battery charger is highly recommended.

Mechanic-Grade Diagnostic Values

• Immobilizer Antenna (Exciter Coil) Resistance — expected: A specific Ohm value is not published, but a continuity reading between the two pins of the coil's connector should be present. An open circuit (infinite resistance) indicates a failed coil.. Failure: No continuity or an open circuit reading on a multimeter.
• G218 Ground Point Resistance — expected: Under 0.1 Ohms. Failure: A reading higher than 0.1 Ohms between the ground lug and the negative battery terminal indicates a poor ground connection that needs to be cleaned.

Hidden / Shadow Codes Worth Checking

• B3060 00: The '00' is a GM symptom byte for 'No Sub Type Information'. It means the primary code B3060 contains the full description of the fault, and there are no more specific details available from that code alone. (see via Professional scan tools like the GM GDS2 will display the code with its symptom byte.)
• U1962: Lost Communication with Serial Data Gateway Module. On GM's newer Vehicle Intelligence Platform (VIP), this code indicates a failure of the security 'handshake' between modules. If this code is present after programming a module, it can prevent the vehicle from learning keys or remotes, leading to a B3060 fault. (see via A professional scan tool capable of reading codes from all vehicle modules, such as the GM GDS2 with Techline Connect software.)

Scan Tool Commands That Help

• GM GDS2 / High-End Professional Scanner: View 'TDM Valid Key' or 'BCM Key Part Number' Parameter — Use this live data parameter to instantly determine if the vehicle's theft deterrent module is successfully reading and identifying the transponder chip in the key being used. If the parameter shows 'No' or is blank with a key that should be programmed, it points to a bad key, interference, or a faulty antenna.
• GM GDS2 with Techline Connect: Immobilizer Learn — This service function is required to program new keys or to relearn existing keys after a component like the BCM has been replaced. It guides the technician through the necessary steps to add keys to the vehicle's memory.
• GM GDS2 with Techline Connect: Serial Data Authentication Configuration (SDAC) — This function must be performed after replacing or reprogramming a major module on newer GM platforms. It establishes the security handshake between all modules. If it fails, key learning will be disabled. This should be run if a U1962 code is present after a repair.
• Autel KM100 / similar advanced key programmer: All Keys Lost / Add Key — Used when all original keys are lost. For modern GM vehicles, this function often requires an active internet connection to retrieve the vehicle's specific PIN code from the manufacturer's servers before it can program a new key into the BCM.

Wiring & Ground Locations

• G218 — Located on the passenger side dashboard frame, near the A-pillar. It is often necessary to pull back the carpet or remove the kick panel to access it.. This is a critical ground point for the Body Control Module (BCM). Factory paint under the ground lug can create a poor connection, leading to unstable voltage at the BCM. This can cause a cascade of communication errors and intermittent no-start conditions, mimicking a failed BCM or key. Cleaning this ground to bare metal is a crucial diagnostic step for widespread electrical issues.
• BCM Fuses (Instrument Panel) — In the instrument panel fuse box, located inside the vehicle, often on the driver's or passenger's side of the dash.. For the 2018-2024 Terrain, fuses F05 and F08 are listed as powering the Body Control Module. A loss of power on these circuits would disable the theft deterrent system entirely.
• Passive Entry/Start Fuse (F34) — In the small fuse box located under the steering wheel.. Fuse F34 (5A) specifically powers the Passive Entry and Passive Start system. A failure of this fuse could cause issues with key fob detection, potentially leading to a no-start and related security codes.

Real Owner Repair Stories

• YouTube Channel 'Car Operation Center' (2018 Chevrolet Silverado (similar GM security system)) — All keys lost, no-start condition, DTC B3060 (Unprogrammed Transponder) present in the BCM.
  ❌ Tried (didn't work) Using a non-original (aftermarket) key did not work.
  ✅ What actually fixed it An Autel KM100 key programmer was used to perform an 'All Keys Lost' procedure. This required an active internet connection for the tool to retrieve the vehicle's security PIN code. A new, original GM key was then successfully programmed to the BCM, which resolved the code and allowed the vehicle to start. The technician noted it was important to keep other key fobs away from the programming area to prevent signal interference.

OEM Part Supersession History

• 13519672 → 13534190 — Standard part revision and consolidation by the manufacturer.
• 13522387 → Interchangeable with 13594646, 13534188 — These part numbers are listed as compatible interchanges for the same BCM used in 2018-2019 Terrain and Equinox models. This is useful for sourcing used parts.
  Heads up: While physically interchangeable, any replacement BCM (new or used) must be professionally programmed to the specific vehicle's VIN and options using software like GM's Techline Connect.