B3055 on 2020-2025 Cadillac CT4: 'No Remote Detected' Causes and Fixes

What's Unique About the 2020-2025 Cadillac CT4

The Cadillac CT4, built on the GM Alpha 2 platform, uses a modern keyless ignition system where this fault is entirely related to the wireless communication with the key fob. This platform is particularly sensitive to Radio Frequency Interference (RFI), a fact highlighted in multiple versions of GM Technical Service Bulletin #PIC5650. Owners often find that low-quality aftermarket devices, especially phone chargers plugged into the 12V socket, can generate enough RF noise to block the key fob's 125 kHz or 433 MHz signals and trigger a B3055 code. This leads to a frustrating no-start situation that isn't caused by a broken part, but by signal jamming.

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 then immediately stalls
• Security indicator light is on or flashing
• Message on the driver information center (DIC) such as 'No Remote Detected 🎬 Watch this video to see how to start your Cadillac with a dead fob.'
• Keyless entry functions (lock/unlock) may work intermittently or not at all

Most Likely Causes

1. Weak or Dead Key Fob Battery 🔴 High Probability → Shop Vehicle Battery Key fob batteries have a finite life of 2-4 years. As the CR2450 battery weakens, its signal strength diminishes, making it harder for the car's multiple antennas to detect it.
   How to confirm: Try the spare key fob. If the car starts, the issue is with the primary fob. A 'Key Fob Battery Low' message may also appear on the dash. You can also try starting the car by placing the weak fob in the dedicated transmitter pocket, which is located inside the center console storage area 🎬 See exactly where to find the hidden transmitter pocket. after removing the top tray.
   Typical fix: Replace the battery inside the key fob. The 2020-2025 CT4 key fob uses a CR2450 battery. 🎬 Watch: Step-by-step guide to replacing your CT4 key fob battery.
   Est. part cost: $5-$15
2. Radio Frequency Interference (RFI) 🔴 High Probability As noted in GM TSB #PIC5650M, the vehicle's keyless entry receivers are sensitive to interference from aftermarket electronics, particularly cheap, unshielded devices plugged into the 12V power outlets (cigarette lighter). These can include phone chargers, dash cams, USB hubs, and even aftermarket LED interior lights.
   How to confirm: Unplug all aftermarket devices from the vehicle's power outlets. Move other key fobs, garage door openers, and building access cards away from the vehicle's interior and try to start the car again. If the car starts, one of the removed devices was the source of the RFI.
   Typical fix: Identify and remove the source of the interference. Use high-quality, well-shielded electronic accessories that are certified to not emit excessive RF noise to prevent future occurrences.
   Est. part cost: $0
3. Defective or Damaged Key Fob 🟡 Medium Probability → Shop Keyless Entry Transmitter The internal transponder chip or circuitry can be damaged if the key fob is dropped, exposed to moisture, or simply fails over time.
   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 fob is faulty. A professional locksmith or dealer can also test the fob's signal output.
   Typical fix: The key fob must be replaced and programmed to the vehicle by a dealership or a qualified automotive locksmith with access to GM's programming software.
   Est. part cost: $150-$400

Rare But Worth Checking

• Faulty Body Control Module (BCM) or Remote Control Door Lock Receiver (RCDLR): → Shop Keyless Entry Receiver This is an uncommon but possible cause, especially if the vehicle experiences other strange electrical issues. TSB #PIC5650M acknowledges that module issues can cause this code, but recommends ruling out all other possibilities first. TSB #16-NA-061 also notes that a disconnected coax cable to the RCDLR or its antenna can cause this issue along with poor RKE range and TPM sensor faults.
• Loose RCDLR Antenna Connection: According to GM TSB #16-NA-061, the antenna system for the RCDLR has several connection points (at the receiver, at the amplifier module, at the rear glass antenna) that can become loose or disconnected. This would weaken the signal from the fob, causing a 'No Fob Detected' message and DTC B3055, often accompanied by poor remote range and 'Service Tire Monitor System' warnings.

Diagnosis Steps

1. Note the security light on the dash and any messages on the DIC, such as 'No Remote Detected'.
2. Try your spare key fob. If the car starts, the problem is isolated to your primary key fob.
3. If the spare key also doesn't work, remove ALL aftermarket electronics (phone chargers, dash cams, USB power banks, etc.) from the car's power outlets to eliminate Radio Frequency Interference (RFI).
4. Attempt to start the vehicle by placing the key fob in the transmitter pocket. To access it, open the center console, remove the top tray, and place the fob in the dedicated slot. This is a backup method designed to work with a weak fob battery.
5. Replace the battery in the key fob (CR2450). This is the most common fix.
6. If the issue persists with a new battery and no RFI sources, the key fob itself may be damaged or have an internal failure.
7. If neither key works and RFI has been ruled out, the vehicle requires professional diagnosis. A technician will use a scan tool to check for faults in the Body Control Module (BCM) and Remote Control Door Lock Receiver (RCDLR) and inspect the RCDLR antenna connections as per TSB #16-NA-061.

Parts You'll Likely Need

• Key Fob Battery (OEM #CR2450) — This is the most frequent cause of the B3055 code. The battery's power is required to transmit the security signal to the vehicle.
  Trusted brands: Energizer, Duracell, Panasonic
  OEM price range: $5-$15
  Aftermarket price range: $2-$10
• Keyless Entry Remote Fob (OEM #13548127 (supersedes 13536990, 13538860, 13541988)) — If the key fob's internal transponder has failed, the entire unit must be replaced and programmed to the vehicle.
  Trusted brands: ACDelco (OEM)
  OEM price range: $150-$300
  Aftermarket price range: $70-$150

Related Codes That Often Appear With This One

• B3060 — This code is also related to the security system and key data, and is listed alongside B3055 in TSB #PIC5650M as part of the same fault condition.
• B3935 — This code indicates a transponder authentication failure and is also frequently seen with B3055, pointing to a problem in the key verification process.
• C0750, C0755, C0760, C0765 — These are DTCs for the Tire Pressure Monitor (TPM) system. Since the RCDLR module often handles both keyless entry and TPM signals, a fault in the RCDLR or its antenna can cause both B3055 and these TPM codes to set simultaneously, as noted in TSBs PIC5650M and 16-NA-061.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Addresses an intermittent no crank, no start, or start/stall concern with the security light on, listing B3055 as a potential DTC and highlighting Radio Frequency Interference from aftermarket devices as a primary cause.
• 16-NA-061: Details how a disconnected or poor connection in the RCDLR antenna system can cause a 'No Fob Detected' message (and B3055) along with TPM system warnings.

Platform-Specific Known Issues

• Per TSB #PIC5650M, the 2020-2025 Cadillac CT4 platform can experience an intermittent no-crank or start-stall condition with the security light on, with B3055 being a key diagnostic code. The bulletin strongly suggests investigating RFI as a primary cause before replacing parts.
• A Reddit user with a 2021 CT4 reported an electrical issue where the car would not recognize any key fob, which was repaired under warranty. This aligns with the symptoms of code B3055.