B3060 on 2020-2025 Cadillac CT4: 'No Remote Detected' and No-Start Causes

What's Unique About the 2020-2025 Cadillac CT4

The first-generation Cadillac CT4, built on the GM Alpha 2 platform, uses a sophisticated keyless entry and start system that is highly sensitive to radio frequency interference (RFI). While the B3060 code's meaning is consistent across GM, this platform's susceptibility to RFI from other fobs, access cards, aftermarket LED lights, or even USB phone chargers is a primary cause of intermittent no-start conditions. GM has acknowledged these security system issues in multiple versions of Technical Service Bulletin #PIC5650, which explicitly lists RFI as a major diagnostic consideration before replacing any parts.

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
• 'No Remote Detected' message on the driver information center (DIC)
• Security indicator light is illuminated or flashing on the dashboard
• Keyless entry functions (door unlock/lock) fail to work.

Most Likely Causes

1. Radio Frequency Interference (RFI) 🔴 High Probability Modern keyless systems are sensitive. GM TSB #PIC5650M explicitly warns that other key fobs, building access cards, aftermarket LED lighting, and USB chargers can 'jam' the 125 kHz, 315 MHz, or 433 MHz signals the car uses to communicate with the fob.
   How to confirm: Remove all other electronic items from the keychain and from the vehicle's cabin, especially aftermarket USB chargers and LED lights. Try starting the car with the isolated key fob. If it starts, RFI was the cause.
   Typical fix: Keep the key fob isolated from other devices. If the problem persists, use the transmitter pocket in the center console storage area to start the vehicle, as this uses a direct reader to bypass RFI.
   Est. part cost: $0
2. Weak or Dead Key Fob Battery 🔴 High Probability → Shop Vehicle Battery Key fob batteries have a finite life. A weak battery may not have enough power to send a strong, clear signal. The CT4 fob uses a CR2450 battery, which is different from the more common CR2032 used in some other GM fobs.
   How to confirm: Try the spare key fob. If the spare works, the primary fob's battery is the likely culprit. A 'low key fob battery' message may also appear on the dash. A user on a Carly forum confirmed this exact scenario on their 2020 CT4.
   Typical fix: Replace the CR2450 battery inside the key fob.
   Est. part cost: $2-$8
3. Key Fob Not in Range or Signal Blocked 🟡 Medium Probability → Shop Keyless Entry Transmitter The key may be at the edge of its detection range or in a location within the cabin where the signal is obstructed, such as a purse or pocket next to a smartphone.
   How to confirm: Move the key fob to different locations inside the car and attempt to start. Place the key fob in the dedicated transmitter pocket as described in the owner's manual.
   Typical fix: Ensure the key is in a clear location or use the transmitter pocket. This pocket uses a direct reader to bypass most signal issues.
   Est. part cost: $0
4. Faulty or Unprogrammed Key Fob ⚪ Low Probability → Shop Keyless Entry Transmitter Physical damage (dropping the key), water damage, or internal electronic failure can render a key fob inoperable. This also occurs if a new, unprogrammed key is used. Programming a new fob for these vehicles requires dealer-level tools.
   How to confirm: If the spare key works reliably and the primary key does not (even with a new battery and no RFI), the primary key is faulty.
   Typical fix: The faulty key fob must be replaced and programmed to the vehicle by a dealer or qualified automotive locksmith with access to GM's Service Programming System (SPS2).
   Est. part cost: $200-$500

Rare But Worth Checking

• Weak Vehicle 12V Battery: → Shop Vehicle Battery A failing car battery can cause low voltage to various control modules, including the Body Control Module, leading to unpredictable security system behavior and communication errors. These cars are known to be very sensitive to voltage.
• Faulty Body Control Module (BCM): → Shop Body Control Module In rare instances, the BCM itself, which manages the security system, can fail. Symptoms often include multiple, unrelated electrical issues (lights, windows, wipers acting erratically) and communication codes (U-codes). This is an expensive last resort and should only be considered after all other possibilities are exhausted.
• Wiring Harness Issue: A user on the 'Cadillac V-Series Forums' with a new CT4-V Blackwing experienced a cascade of electrical warnings, including a no-start, that was ultimately traced to a short in the main engine wiring harness. This highlights that while rare, a wiring fault can mimic module or key failures.

Diagnosis Steps

1. Check for a 'No Remote Detected' or 'Replace Key Fob Battery' message on the dash.
2. Try to start the vehicle using the spare key fob. If it works, the issue is with the primary key fob.
3. If the spare key also fails, remove all other keys, fobs, and access cards from the keychain. Unplug any aftermarket phone chargers or devices, especially LED lights, as instructed by GM TSB PIC5650M. Try starting again.
4. If the car still won't start, locate the transmitter pocket. The owner's manual and some programming guides show it inside the center console storage bin. Place the fob in the pocket and attempt to start the vehicle. This bypasses most signal issues.
5. If the vehicle starts from the pocket, replace the key fob's CR2450 battery.
6. If none of the above steps work, the vehicle has a persistent fault. Scan the BCM for codes B3060, B3055, and B3935 using a professional scan tool.
7. If a key is determined to be faulty, it will need to be replaced and programmed by a professional using GM's SPS2 software.
8. If all keys fail to work even in the transmitter pocket, the issue may be with the vehicle's BCM, related antennas, or wiring, requiring professional diagnosis.

Parts You'll Likely Need

• Key Fob Battery (OEM #CR2450) — This is the most common and inexpensive component to fail, causing a weak signal that the car cannot recognize. Note: The CT4 uses a CR2450, not a CR2032.
  Trusted brands: Duracell, Energizer, Panasonic
  OEM price range: $8-$15
  Aftermarket price range: $2-$8
• Keyless Entry Remote Fob (5-Button) (OEM #13548127 (Supersedes: 13536990, 13538860, 13541988)) — If the internal electronics of the key fob fail, it must be replaced and programmed to the vehicle.
  Trusted brands: ACDelco, GM Genuine Parts
  OEM price range: $200-$450
  Aftermarket price range: $70-$180

Related Codes That Often Appear With This One

• B3055 — This code means 'No Transponder Modulation or No Transponder,' indicating the security module received no signal from the key at all. It often appears with B3060 when the key fob battery is completely dead or the fob is malfunctioning.
• B3935 — This code means 'Transponder Authentication Failed.' It can be set alongside B3060 if the system receives a signal but cannot verify it as authentic, often due to heavy RFI or a faulty key.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses intermittent no crank, no start, or start/stall concerns with the security light on, potentially involving DTCs B3055, B3060, B3935, and others. This TSB strongly advises checking for RFI from aftermarket accessories like LED lights and phone chargers before replacing any components.

Platform-Specific Known Issues

• Per TSB #PIC5650M, this code is associated with intermittent no-crank, no-start, or start/stall conditions where the security light comes on. This indicates it is a known issue for which GM has provided extensive diagnostic guidance to technicians, heavily emphasizing the need to rule out Radio Frequency Interference (RFI) from aftermarket devices before replacing parts.
• A user on the Cadillac V-Series Forums reported a brand new 2023 CT4-V Blackwing suffering from multiple electrical failures and a no-start condition just miles after leaving the dealership. The root cause was eventually found by a Field Service Engineer to be a short in the main engine wiring harness, demonstrating that wiring issues can cause symptoms that mimic a key or module failure.

Mechanic-Grade Diagnostic Values

• Immobilizer Data Parameter (Live Data) — expected: Using a GM GDS2 scan tool, the 'TDM Valid Key' parameter should read 'Yes' when a correct key is present and the ignition is ON.. Failure: A status of 'No' indicates a key programming or authentication failure.

Hidden / Shadow Codes Worth Checking

• B3060 00: The '00' is a standard GM symptom byte for 'No Sub Type Information'. It means the base code B3060 contains the full description of the fault ('Unprogrammed Transponder Identification Code Received'), and there are no more specific details available from the code itself. (see via Professional scan tools like the GM GDS2 or Tech2 will display the code with its symptom byte.)

Scan Tool Commands That Help

• GM GDS2: Module Diagnostics > K9 Body Control Module > Data Display > Immobilizer Data — Use this function to view live data parameters like 'TDM Valid Key' to see if the vehicle is recognizing the key being used as valid, learned, or invalid.
• GM GDS2: Module Diagnostics > K9 Body Control Module > Configuration/Reset Functions > Immobilizer Learn — This function is required to program new keys to the vehicle after a key or BCM replacement. It guides the technician through the process of adding or replacing key fobs in the vehicle's memory.

Wiring & Ground Locations

• Keyless Entry Antennas — The CT4 uses multiple antennas: in the front console (PN 13545326), doors, and potentially rear bumper/trunk area (PN 13592452, 13546098). A wiring diagram is required for exact locations.. A damaged antenna or its wiring can prevent the BCM from detecting the key fob, leading to a no-start condition. A fault in one antenna can cause 'No Remote Detected' messages even if the car eventually starts.
• BCM (Body Control Module) — On similar GM vehicles, the BCM is typically located behind the lower side of the dashboard or kick panel, often on the driver's or passenger's side. A service manual for the CT4 is needed to confirm the exact location.. The BCM is the central module for the anti-theft system. All key authentication signals are processed here. A poor ground connection (e.g., G201 in the left kick panel on other GM cars) or a faulty power feed to the BCM can cause this code.

Real Owner Repair Stories

• Carly Forum User (2019 Cadillac CT5 (similar platform)) — Key fob stopped working for remote lock/unlock, had to use physical key to start. Radio reception was unaffected.
  ❌ Tried (didn't work) Initial thought was a faulty antenna.
  ✅ What actually fixed it The issue was a damaged cable connection to the key fob antenna module, not the antenna itself. The repair involved fixing the wiring harness and connection points.

OEM Part Supersession History

• 13536990, 13538860, 13541988 → 13548127 — Standard part evolution and updates by the manufacturer.
  Heads up: The newer part number 13548127 is the correct service replacement for the earlier numbers on the 2020-2025 CT4.
• 13592451 → 13546098 — Standard part evolution for the keyless entry antenna.

Model Year Variations Within This Range

• 2021+: For the 2021 model year, the CT4 and CT5 received significant technology updates, including standard wireless Apple CarPlay/Android Auto and a new optional 12-inch digital instrument cluster. Enhanced Super Cruise also became available. While not directly related to the B3060 code, these changes represent software and hardware differences from the 2020 model.