B3055 on 2018-2025 GMC Terrain: Key Not Detected, Causes and Fixes

What's Unique About the 2018-2025 Gmc TERRAIN

For the 2018-2025 GMC Terrain, which uses a keyless push-to-start system, this code is frequently linked to intermittent issues that are hard to duplicate. General Motors has issued multiple Technical Service Bulletins (TSBs) pointing to radio frequency interference (RFI) from common aftermarket devices like phone chargers, dash cams, and even non-OEM LED lights as a primary culprit. These devices can 'jam' the low-frequency signal the car uses to detect the key fob, leading to the B3055 code and a frustrating no-start situation. The issue is so prevalent that GM service literature 🎬 Watch: A helpful guide to fixing 'No Fob Detected' errors explicitly advises technicians to ask customers about any non-original devices plugged into the vehicle before attempting any parts replacement.

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
• "Service Theft Deterrent System" message on the driver information center (DIC).
• Security indicator light (an icon of a car with a lock) is illuminated or flashing on the dashboard.
• "No Fob Detected" or "Key Not Present" message on the DIC.
• Remote key fob functions (lock/unlock) may work, but the vehicle still won't start.

Most Likely Causes

1. Radio Frequency Interference (RFI) 🔴 High Probability Modern vehicle systems, including keyless entry, operate on specific radio frequencies that are susceptible to interference from the increasing number of aftermarket electronic devices plugged into vehicles. GM has specifically highlighted this in TSBs like PIC5650.
   How to confirm: Unplug all aftermarket devices (phone chargers, dash cams, USB power banks, etc.) from the 12V and USB ports. Remove other vehicle keys, access cards, or toll passes from the key ring. If the vehicle starts, RFI was the cause. An RFI meter can also be used to locate stray signals.
   Typical fix: Identify and remove the interfering device. Use higher-quality, properly shielded electronics.
   Est. part cost: $0
2. Weak or Dead Key Fob Battery 🔴 High Probability → Shop Vehicle Battery Key fob batteries have a finite life and are a common failure point for any keyless system. A weak battery may not provide enough power for the transponder to communicate effectively.
   How to confirm: Try starting the vehicle with the spare key fob. Alternatively, place the problematic key fob in the designated backup slot (check owner's manual, but it's often inside the center console storage bin 🎬 Watch: How to start your Terrain with a dead fob or a cupholder) which allows the car to read the fob even with a dead battery. If the car starts this way, the battery is the likely culprit.
   Typical fix: Replace the CR2032 battery inside the key fob. 🎬 See this quick walkthrough for replacing your key fob battery
   Est. part cost: $1-$5
3. Faulty Key Fob 🟡 Medium Probability → Shop Keyless Entry Transmitter Key fobs can be damaged by being dropped or exposed to moisture, causing the internal transponder chip to fail.
   How to confirm: If the vehicle starts with the spare key but not the primary key (even after a battery change and checking for RFI), the primary key fob is likely faulty. A locksmith or dealer can also test the fob's signal output.
   Typical fix: Replace and program a new key fob. This must be done by a dealer or an automotive locksmith with the proper equipment like GM's SPS2 software.
   Est. part cost: $75-$250
4. Faulty Keyless Entry Control Module or Antenna ⚪ Low Probability → Shop Keyless Entry Module While less common, the module that receives the key's signal or one of its antennas can fail. This is sometimes referred to as the Theft Deterrent Module (TDM) or Keyless Entry Control Module.
   How to confirm: This requires professional diagnosis with a scan tool that can monitor the BCM and keyless entry system data streams to see if the module is powered and communicating. A technician would check for power, ground, and signal at the module's connector.
   Typical fix: Replace the faulty module or antenna and perform the necessary programming/setup procedure.
   Est. part cost: $150-$400

Rare But Worth Checking

• Failing Body Control Module (BCM): → Shop Body Control Module The BCM is the central computer for this system. While not a common failure, if all other components (keys, antennas, wiring) test good, the BCM itself may be the issue. This is an expensive last resort and can cause many other seemingly unrelated electrical issues.
• Low Vehicle Battery: → Shop Vehicle Battery A weak main vehicle battery can cause low voltage to various control modules, leading to unpredictable behavior and communication errors, including setting a B3055.
• Incorrect Key Usage (Flip Keys): On models with a flip-style key, if the key is not fully extended and locked into position when inserted into the ignition, it can be angled incorrectly, preventing the exciter coil from reading the transponder. TSB PIT5030E addresses this specific user-induced issue.

Diagnosis Steps

1. Check the dashboard for a "Service Theft Deterrent System" message or a security light.
2. Remove ALL aftermarket electronic devices from the vehicle's power and USB ports. This is the most critical first step according to GM TSBs.
3. Remove any other keys, fobs, or RFID cards (like building access cards) from the same keyring as the vehicle's key fob.
4. Try starting the vehicle with your spare key fob.
5. If the spare key doesn't work, try placing the original key fob in the vehicle's transmitter pocket/backup slot (refer to your owner's manual for the location, often in the center console or a cupholder) and attempt to start the engine.
6. If the vehicle starts using the backup slot, replace the CR2032 battery in the key fob.
7. If the issue persists, have the vehicle scanned with a professional tool capable of reading Body Control Module (BCM) codes to confirm B3055 is active and not just in history.
8. Using the scan tool, check the immobilizer data to see if a key is detected ('Transponder Key' parameter should read 'Present').
9. If no key is ever detected and RFI has been ruled out, suspect a faulty key fob or a problem with the keyless entry control module/antennas.
10. If a new key cannot be programmed, further diagnosis of the Keyless Entry Control Module, BCM, and related wiring is required by a professional.

Parts You'll Likely Need

• Key Fob Battery (OEM #CR2032) — This is the most common and cheapest fix. The fob requires power to transmit its security code.
  Trusted brands: Energizer, Duracell, Panasonic
  OEM price range: $1-$5
  Aftermarket price range: $1-$5
• Keyless Entry Transmitter (Key Fob) (OEM #13591388 (3-Button, without remote start), 13584502 (5-Button, with hands-free), 13522898 / 13547800 (4-Button, 2022-2024)) — If the fob's internal electronics fail, it must be replaced. The new fob requires programming to the vehicle. Part numbers vary by year and options (remote start, power liftgate).
  Trusted brands: ACDelco (OEM)
  OEM price range: $150-$250
  Aftermarket price range: $75-$150

Related Codes That Often Appear With This One

• B3060 — This code is also related to the transponder key system and often appears with B3055, as noted in GM TSB PIC5650M.
• B3935 — Relates to the Transponder Authentication Status. It's part of the same security handshake process and can be set alongside B3055 during a failure.
• P3055 — Note the 'P' instead of 'B'. On some GM vehicles with start-stop systems, a P3055 code can set, relating to the DC/DC Converter. This can cause widespread electrical issues and may appear alongside the security code B3055, though it is a separate issue related to the power supply transformer.

Technical Service Bulletins (TSBs) & Recalls

• PIC5650M: Mentions intermittent no crank/no start/stall with security light on, listing B3055 as a possible code for this vehicle range.
• PIC5650B/G/K: Details how aftermarket devices and other RFID cards cause Radio Frequency Interference (RFI) that can lead to a no-start and codes like B3055, and advises checking for these before replacing parts.
• PIT5030E: Specific to flip-key models, explains how an improperly angled key can fail to communicate with the vehicle and set a B3055.

Platform-Specific Known Issues

• GM Technical Service Bulletin PIC5650M directly addresses an intermittent no-crank, no-start, or start/stall condition with the security light on for 2018-2025 GMC Terrains, specifically listing B3055 as a potential DTC.
• Multiple versions of TSB PIC5650 (e.g., PIC5650K, PIC5650G, PIC5650B) strongly emphasize that Radio Frequency Interference from aftermarket devices is a primary cause for these symptoms and should be the first diagnostic check.
• TSB PIT5030E notes that on vehicles with a physical flip key, not having the key fully extended can cause a B3055 code due to poor signal transmission, although this applies to earlier models in the generation.

Hidden / Shadow Codes Worth Checking

• B3055 00: The '00' is a symptom or failure type byte. For this specific code, GM documentation indicates 'No Sub Type Information,' meaning the base DTC text string provides the complete description of the failure. (see via A professional scan tool like the GM GDS2 or a high-end aftermarket scanner will display the code with its two-digit symptom byte.)

Scan Tool Commands That Help

• GM GDS2 / Tech2: Immobilizer Learn / Key Programming — This function is required when adding a new key fob, replacing the Body Control Module (BCM), or replacing the Keyless Entry Control Module. If all keys are lost, this procedure must be performed by a dealer or locksmith with security access.
• Professional Scan Tool: Immobilizer Data Display — Before attempting any programming, a technician should view the live data stream for the immobilizer system. Parameters like 'Transponder Key Status' should change from 'Not Present' to 'Present' when a valid key is brought near the reader, which helps confirm if the key or the vehicle's reader is the source of the problem.

Wiring & Ground Locations

• Body Control Module (BCM) — On second-generation Terrains, the BCM is typically located behind the driver's side lower dashboard panel, to the left of the steering column.. The BCM is the central computer that manages the immobilizer system. A loose connection or corrosion at its connectors can cause a B3055 code and other electrical issues.
• Keyless Entry Control Module — Service information suggests this module may be located below the center console.. This module, along with its antennas, is directly responsible for receiving the signal from the key fob. A failure here is a direct cause of B3055 if the key and BCM are good.
• F17 Fuse (Data Link Connector) — Located in the small fuse box under the steering wheel, near the OBD-II port. It is a 10 Amp red fuse.. If a technician's scan tool will not power on, this fuse is the first place to check. Without a functional OBD-II port, diagnosing any electronic code, including B3055, is impossible.
• Keyless Entry Antennas — These are small modules (e.g., P/N 13580790) placed in various locations around the vehicle, such as in door handles, the center console, and the rear bumper area, to detect the key fob's proximity.. A single failed antenna can cause a 'No Fob Detected' message when trying to use a specific door or start the vehicle. A scan tool can often show signal strength from each antenna to pinpoint a failure.

Real Owner Repair Stories

• ADD AUTOMOBILE SERVICES YouTube Channel (2013 Chevrolet Equinox (similar GM platform)) — Intermittent no-start with security light on. Scan tool showed code B3055 'No transponder modulation'. The car would sometimes start and sometimes not.
  ❌ Tried (didn't work) Cycling the key multiple times.
  ✅ What actually fixed it The technician determined the original transponder chip in the key was intermittently failing. Using a VVDI key tool, he read the data from the original chip and cloned it onto a new, more powerful 'super chip'. He then placed this new chip inside the original key fob. This provided a consistent signal, permanently resolving the intermittent no-start issue.

OEM Part Supersession History

• 13522898 → 13547800 — Standard part revision or manufacturer change.
  Heads up: Part 13522898 was specified for 2022-2024 models; the new part 13547800 replaces it for those years.

Model Year Variations Within This Range

• 2018-2021: These model years primarily use the 5-button key fob with part number 13584502 (FCC ID: HYQ1AA).
• 2022-2024: These model years use a different key fob, originally part number 13522898, which has been superseded by 13547800. While they may appear similar, the internal electronics are different, and they are not interchangeable with the earlier fobs.