B3060 on 2007-2011 Cadillac STS: Meaning, Causes, and Fixes for No-Start Issues

What's Unique About the 2007-2011 Cadillac STS

For this generation of Cadillac and other GM vehicles built on the Sigma platform, the immobilizer system is notoriously sensitive to radio frequency interference (RFI). A comprehensive GM Technical Service Bulletin (TSB PIC5650, with multiple revisions like M) highlights that B3060 can be set intermittently not because of a faulty part, but due to other RFID devices on the owner's keychain. This can include building access cards, gas station speed passes, or even keys from other vehicles. This interference can block the signal from the actual car key, leading to a frustrating and hard-to-duplicate no-start condition. The TSB also warns that aftermarket electronics like cell phone chargers, USB power banks, and even some LED interior lights can generate enough RFI to trigger this fault.

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 and immediately stalls
• Security light is illuminated or flashing on the dashboard
• "Service Theft Deterrent System" message on the driver information center
• "No Remote Detected" or "No Fobs Detected" message on the DIC

Most Likely Causes

1. Radio Frequency (RFID) Interference 🔴 High Probability As documented in GM TSB #PIC5650M, the vehicle's immobilizer system is sensitive to interference from other RFID-enabled cards or fobs on the keychain, as well as aftermarket electronics plugged into the car. The immobilizer operates at 125 kHz, and other devices in the 120-135 kHz range can interfere.
   How to confirm: Remove all other keys, access cards, and fobs from the Cadillac key ring. Unplug any aftermarket chargers or devices. Try to start the vehicle with the key by itself. If the car starts reliably, interference was the cause.
   Typical fix: Keep the car key separate from other RFID devices. Use high-quality, OEM-certified chargers to avoid RFI.
   Est. part cost: $0
2. Defective Key Transponder 🟡 Medium Probability The electronic chip inside the key head can fail from being dropped or from age. The key fob battery for push-to-start models is a CR-2032 and may need replacement every couple of years.
   How to confirm: Try starting the vehicle with a spare key. If the spare key works reliably, the primary key is faulty. If the key fob battery is dead on a push-to-start model, you can often start the car by pushing the START button with the fob itself. 🎬 Watch: How to start your STS with a dead fob battery.
   Typical fix: Purchase a new key and have it professionally cut and programmed to the vehicle. This can be done by a dealer or an automotive locksmith. 🎬 See how to program a new key fob without special tools.
   Est. part cost: $180-$390
3. Faulty Ignition Lock Cylinder Reader (Exciter Coil) ⚪ Low Probability The coil that energizes and reads the key transponder can fail, preventing it from reading any key, even a known-good one. This component is part of the ignition lock cylinder assembly.
   How to confirm: If neither the primary nor the spare key works, and there is no RFID interference, the reader is a likely suspect. A technician can test the circuit with a multimeter or specialized diagnostic tool. This is a common point of failure after ruling out keys and interference.
   Typical fix: Replace the ignition lock cylinder assembly which contains the reader coil. The new cylinder will need to be programmed.
   Est. part cost: $77-$250
4. Failing Body Control Module (BCM) or Theft Deterrent Module (TDM) ⚪ Low Probability The module that stores the key data and makes the security decision can fail internally, though this is less common than key or reader issues.
   How to confirm: This is a diagnosis of exclusion after all other causes (key, interference, reader coil, wiring) have been ruled out. Requires a professional scan tool to check for communication errors with the module and to verify its programming.
   Typical fix: Replace the BCM or TDM and program it to the vehicle using specialized equipment like a Tech2 or a J2534 pass-through device with a GM SPS subscription.
   Est. part cost: $300-$700

Rare But Worth Checking

• Corroded Fuse Block Connections:
• Worn Ignition Switch:

Diagnosis Steps

1. Check the dashboard for an illuminated security light. This confirms an anti-theft issue.
2. Remove all other keys, fobs, and access cards from the key ring. Unplug ALL aftermarket devices (phone chargers, dash cams, etc.). Attempt to start the car with the Cadillac key alone.
3. If the car still doesn't start, try your spare key. If the spare key works, the first key is faulty.
4. For push-to-start models, if the fob battery is suspected to be dead, try starting the car by pushing the 'Start' button directly with the fob.
5. Attempt a '30-Minute Relearn' procedure: Turn the key to the 'ON' position (without starting) and leave it for 10-11 minutes until the security light goes out. Turn the key off for 5 seconds. Repeat this cycle two more times for a total of three 10-minute cycles. 🎬 Watch this walkthrough of the security system reset and bypass. After the third cycle, turn the key off and then attempt to start the engine.
6. If neither key works and the relearn fails, inspect the wiring and connector at the ignition lock cylinder for any visible damage or loose connections.
7. If no obvious issues are found, the vehicle should be taken to a qualified technician. They will use a scan tool to read the immobilizer system data, check the status of the keys ('TDM Valid Key' parameter), and test the function of the ignition reader coil and the Theft Deterrent Module (TDM) or Body Control Module (BCM).

Parts You'll Likely Need

• Ignition Key with Transponder (OEM #B111-PT) — The chip in the original key may have failed. A new key must be programmed to the vehicle's immobilizer.
  Trusted brands: ACDelco
  OEM price range: $180-$390
  Aftermarket price range: $75-$150
• Ignition Lock Cylinder with Immobilizer Reader (OEM #ACDelco D1492C or 15841209) — The reader coil that surrounds the ignition lock and reads the key chip can fail, preventing it from reading any key.
  Trusted brands: ACDelco, Dorman, Standard Motor Products
  OEM price range: $150-$250
  Aftermarket price range: $55-$150

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') and is often set alongside B3060 as part of the same immobilizer fault event.
• B3935 — This code indicates a transponder mismatch ('Transponder Identification Code Does Not Match'), which is functionally very similar to B3060 and is mentioned in the same TSB.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank, no start, or start/stall conditions with security light on, potentially caused by RFID interference. It lists B3060 as a possible diagnostic trouble code. [Bulletin #PIC5650M]
• PIC5650B/C/G/K: Revisions of the original TSB, expanding the model years and list of potential RFI sources to include things like aftermarket LED lights and USB chargers.

Platform-Specific Known Issues

• A Technical Service Bulletin (TSB #PIC5650M) was issued by GM for this and other models, noting that an intermittent no-start with code B3060 can be caused by interference from other RFID devices on the keychain, such as building access cards or other vehicle keys. [Bulletin #PIC5650M]
• The same TSB (PIC5650 series) was updated multiple times to include an expanding list of interference sources, such as aftermarket LED lighting, low-quality cell phone chargers, USB power banks, and even decorative 'Bedazzle' trim rings around the ignition cylinder.

Hidden / Shadow Codes Worth Checking

• B3060 00: The '00' is a symptom byte indicating 'No Sub Type Information'. This means the primary code description ('Unprogrammed Transponder Identification Code Received') is the complete failure description available from the module. (see via A professional scan tool like the GM Tech 2 or a modern equivalent that can read manufacturer-specific codes and their symptom bytes.)

Scan Tool Commands That Help

• GM Tech 2 / GDS2: Immobilizer Relearn / Vehicle Theft Deterrent Learn — Used after replacing a key, the BCM/TDM, or the ECM. This function initiates the 10-minute or 30-minute security relearn process required to synchronize the components.
• GM Tech 2 / GDS2: BCM Setup — This is a mandatory step after installing a new Body Control Module. It configures the BCM with the vehicle's specific options (RPO codes) and VIN, and learns the state of other modules like the airbag system.
• GM Tech 2 / GDS2: Data Display > TDM > Valid Key — During diagnosis, this parameter should be monitored while trying each key. It will display 'Yes' or 'No' to quickly confirm if the Theft Deterrent Module is recognizing the key's transponder as valid and learned.

Wiring & Ground Locations

• BCM (Body Control Module) — Located behind the glove compartment. Dash disassembly is required for access.. The BCM is a central module in the Passkey III system, responsible for validating the key transponder data. A poor connection or internal failure can directly cause a B3060.
• RCDLR (Remote Control Door Lock Receiver) — Located under the rear speaker shelf in the trunk area.. The RCDLR handles key fob signals for remote entry and push-to-start authorization. While B3060 is a transponder code, issues with the RCDLR can cause related no-start and security system faults, especially on push-to-start models.
• G200 — A major chassis ground point located behind the left (driver's side) kick panel.. Poor grounding at G200 can cause a host of intermittent electrical issues for interior modules, including the BCM/TDM, leading to communication errors and false security codes.
• Engine Block Ground — A main ground cable connecting the engine block to the vehicle's frame/chassis.. A corroded or loose engine block ground can cause a significant voltage drop during cranking. This can starve modules of the stable voltage they need, potentially causing the BCM/TDM to malfunction and set security codes, even though the primary fault is a bad ground connection.

Real Owner Repair Stories

• Cadillac XLR Forums user (2004 Cadillac XLR (similar GM platform and security system)) — No crank, no start after replacing the RCDLR (Remote Control Door Lock Receiver) and programming new fobs. Fob buttons worked for locks/trunk, but car would not start.
  ❌ Tried (didn't work) Standard key fob programming (glove box slot method).
  ✅ What actually fixed it The ECU had to learn the new RCDLR. This was accomplished by performing a 30-minute security relearn procedure (3 cycles of turning the car to accessory for 10 minutes until the security light goes off). This synchronized the new RCDLR with the ECU and enabled the car to start.
• Reddit user r/Cadillac (2007 STS) — After ECM reprogramming, the car would not start due to an anti-theft issue. The 30-minute relearn procedure completed, but the DIC was stuck on 'READY FOR FOB 1' and would not recognize the fob.
  ❌ Tried (didn't work) Locksmith attempt to program key., Standard 30-minute key relearn procedure.
  ✅ What actually fixed it The user provided an update stating they 'got a key fob to work' but were still left with an anti-theft system issue preventing the start. This story highlights that even when a fob is partially recognized, a deeper synchronization issue between modules (BCM, ECM, RCDLR) can persist, often requiring dealer-level tools.

OEM Part Supersession History

• Multiple older numbers → 15841209 (for Ignition Lock Cylinder Kit) — Part consolidation and minor revisions over time.
  Heads up: Part 15841209 is often sold as an 'uncoded' cylinder, meaning it must be assembled to match the existing key or re-keyed by a locksmith. It also requires a security relearn procedure after installation.