P0513 on 2018-2024 Buick Enclave: Incorrect Immobilizer Key Causes and Fixes

What's Unique About the 2018-2024 Buick ENCLAVE

The 2018-2024 Enclave uses a passive keyless entry and start system. Unlike older systems with a physical ignition cylinder, this relies entirely on radio frequency communication between the key fob and various antennas in the vehicle. GM has issued a Technical Service Bulletin (TSB #23-NA-165) specifically for this generation and its platform mates, noting that issues like a low vehicle battery, jump-starting, or battery replacement can corrupt the BCM's memory, leading to a loss of key fob functions and a P0513 code. This makes the Enclave and other vehicles on the GM C1XX platform highly sensitive to voltage fluctuations, which can trigger this fault even if the key fob is perfectly fine.

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.
• Keyless entry functions (lock/unlock) do not work.
• Remote start fails.
• A 'No Remote Detected' message appears on the driver information center.
• The vehicle security light on the dashboard may be flashing or illuminated.
• Horn chirps twice when walking away from the vehicle, as if the key was left inside.

Most Likely Causes

1. Weak or Dead Key Fob Battery 🔴 High Probability → Shop Vehicle Battery Key fobs constantly emit a low-power signal for passive entry, and battery life is typically 1-3 years. This is the most frequent and simplest failure point.
   How to confirm: Try using your second key fob. If it works, the first fob's battery is the likely culprit. You can also try starting the vehicle by placing the problematic fob in the transmitter pocket located inside the center console armrest, which allows the car to read the fob even with a dead battery. The pocket is at the very bottom of the armrest compartment, possibly under a liner, and has an indentation shaped like the key. 🎬 Watch: Locate the hidden transmitter pocket to start your Enclave.
   Typical fix: Replace the CR2032 coin battery inside the key fob.
   Est. part cost: $2-$10
2. BCM Memory Corruption After Low Voltage Event 🔴 High Probability As noted in TSB 23-NA-165, the 'GEN3R' BCM on these vehicles can experience memory corruption after a jump-start, battery replacement, or significant voltage drop, causing it to lose its programming for the keys. This is a well-documented weak point for this specific GM platform.
   How to confirm: This is extremely likely if the problem occurred immediately after a battery-related event. A GM-specific scan tool is needed to check for specific BCM fault conditions (like B389A with three or more B392x codes) outlined in the TSB.
   Typical fix: A dealer or qualified shop must follow the procedure in TSB 23-NA-165, which involves a special BCM reprogramming ('Special Data Reset A' or 'Programming A') and an immobilizer relearn procedure. Do not replace the BCM unless this procedure fails. The cost for reprogramming is typically 1-1.5 labor hours.
   Est. part cost: $0 (if only reprogramming is needed)
3. Faulty Key Fob 🟡 Medium Probability → Shop Keyless Entry Transmitter Internal components of the key fob can fail from being dropped, exposure to moisture, or general wear and tear, damaging the transponder chip.
   How to confirm: If a new battery doesn't solve the issue and the spare key works, the original key fob is likely defective. A locksmith or dealer can test the fob's signal output.
   Typical fix: The key fob must be replaced and programmed to the vehicle using specialized equipment. The OEM part number is often 13521090.
   Est. part cost: $150-$400

Rare But Worth Checking

• Faulty Keyless Entry Antenna: → Shop Antenna The vehicle has several antennas to detect the key fob. If one fails, it can cause intermittent 'No Remote Detected' issues, though this is less common than key fob or BCM problems. Diagnosis involves checking for specific antenna fault codes.
• Radio Frequency (RF) Interference: Strong radio signals from other devices can sometimes interfere with the communication between the key fob and the vehicle. Try starting the vehicle in a different location to rule this out. This is a rare but possible cause.
• Internal BCM Hardware Fault: Separate from memory corruption, an internal BCM hardware failure can cause a 'No Fob Detected' message where the fob works for locking/unlocking but not for starting, even in the backup pocket. TSB 21-NA-244 describes this scenario, which requires BCM replacement.

Diagnosis Steps

1. Try the spare key fob. If it works, the problem is isolated to the primary key fob.
2. If the spare key also fails, replace the battery (CR2032) in one of the key fobs.
3. If a new battery does not resolve the issue, try starting the vehicle by placing the key fob in the transmitter pocket. This pocket is located at the bottom of the center console armrest compartment, often under a removable liner. If the vehicle starts, it confirms a weak signal from the fob 🎬 Watch: How to start your car when the remote isn't detected. (either due to a bad battery or a failing fob).
4. Check for any messages on the dashboard, such as 'No Remote Detected'.
5. Recall if the problem started immediately after a jump-start, battery replacement, or low-voltage event. If so, suspect BCM memory corruption as described in TSB 23-NA-165.
6. Scan the BCM and PCM for codes with a professional-grade scan tool. Confirm P0513 is present, and look for related codes like B389A or multiple B392x codes.
7. If TSB 23-NA-165 applies, a GM dealer or qualified independent shop must follow the specific BCM reprogramming and immobilizer relearn procedure outlined by GM.
8. If reprogramming fails or does not apply, have a locksmith or dealer test the signal strength of the key fob(s) to determine if one is faulty.
9. If the fobs are good and reprogramming did not work, further diagnosis of the BCM hardware, wiring, and keyless entry antennas may be required.

Parts You'll Likely Need

• Key Fob Battery (OEM #CR2032) — This is the most common failure point and the easiest and cheapest to fix.
  Trusted brands: Energizer, Duracell, Panasonic
  OEM price range: $5-$10
  Aftermarket price range: $2-$5
• Keyless Entry Remote Fob (5-Button) (OEM #13521090 (FCC ID: HYQ4EA)) — If the internal transponder fails, the entire fob 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

• B389A (Immobilizer Key Information Incorrect)
• B3924, B3925, B3926, B3927 (Environment Identification Codes)
• U-codes (Communication Errors)

Technical Service Bulletins (TSBs) & Recalls

• 23-NA-165: Vehicle Will Not Lock and Unlock (Loss of Active Functions) Crank or Start (Loss of Passive Functions) with DTC P0513 Set.
• 23-NA-163: No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative.
• 21-NA-277: Vehicle Will Not Crank or Will Start and Immediately Stall, DTC P0513 Present.
• 21-NA-244: No Crank / No Start with a 'No Fob Detected' Message on DIC.

Platform-Specific Known Issues

• TSB #23-NA-165 documents a condition where the vehicle will not lock, unlock, crank, or start due to BCM memory corruption, often triggered by a low voltage event like a battery change or jump-start. The fix is a specific BCM reprogramming and immobilizer relearn procedure, not module replacement. This TSB applies to the Enclave and its platform mates with 'GEN3R' BCMs.
• TSB #21-NA-244 describes a less common but related issue where an internal BCM fault causes a 'No Fob Detected' message even when the fob buttons work. This specific scenario requires BCM replacement.

Hidden / Shadow Codes Worth Checking

• B3924, B3925, B3926, B3927: These are 'Environment Identification' codes. The presence of three or more of these codes simultaneously in the BCM is a primary indicator of the memory corruption issue described in TSB 23-NA-165 and related bulletins. (see via A professional scan tool capable of reading manufacturer-specific BCM codes, such as the GM GDS2.)
• B389A: This code for 'Immobilizer Environment Identifier Not Programmed' often sets with P0513 and the B392x codes, further confirming the BCM memory corruption. TSBs note that if this code is not initially present, disconnecting the 12V battery for 30 seconds may cause it to set, confirming the condition. (see via GM GDS2 or an equivalent advanced scan tool.)

Scan Tool Commands That Help

• GM SPS (Service Programming System): K9 Body Control Module “Programming A Per Bulletin 23-NA-163 and 23-NA-165 Only” — This is the primary function, also called 'Special Data Reset A', used to correct the BCM memory corruption as per TSB 23-NA-165. It must be performed before any immobilizer relearn is attempted.
• GM SPS (Service Programming System): Immobilizer procedure “Body Control Module IMMO Learn with Existing Transponder or Remote Key” — This function is used immediately after performing 'Programming A' or 'Special Data Reset A' to relearn the vehicle's existing key fobs to the newly reset BCM.
• GM SPS (Service Programming System): K9 Body Control Module “Special Data Reset B” — This is an escalation procedure. It should only be used if a standard immobilizer learn was attempted *before* running 'Special Data Reset A' and the vehicle still does not start.

Wiring & Ground Locations

• K9 Body Control Module (BCM) — Located under the driver's side of the dashboard, generally to the left of the steering column.. The BCM is the central computer for the immobilizer system. All key validation signals are processed here. A poor connection, water intrusion, or a bad ground to the BCM can cause P0513 and a wide range of other electrical issues.
• Keyless Entry Antennas — Multiple antennas are located throughout the vehicle, including in the doors, center console, and rear bumper area, to detect the key fob for passive entry and starting.. A failure of a specific antenna can lead to a 'No Remote Detected' message and prevent the vehicle from starting, although this is less common than BCM or key fob issues.

Real Owner Repair Stories

• Carly Community Forum (2017 Buick Enclave (same platform, one year prior to range)) — Battery heavily discharging, error messages, flickering lights, difficulty starting, and DTC P0513 stored.
  ❌ Tried (didn't work) Initial speculation focused on the key fob or immobilizer system directly.
  ✅ What actually fixed it A diagnostic at a workshop determined the root cause was a defective battery sensor causing a parasitic drain. This persistent low voltage state was triggering the P0513 immobilizer code. Replacing the battery sensor resolved all issues. The repair cost was 315€.
• acadiaforum.net user reports (2019-2023 GMC Acadia (platform mate)) — Vehicle is completely unresponsive to all key fobs immediately after replacing the 12V battery; no crank, no start.
  ❌ Tried (didn't work) Replacing key fob batteries., Using the spare key fob.
  ✅ What actually fixed it The vehicle required a tow to the dealership. The dealer performed a BCM software update or re-flash as per the GM TSB, which immediately resolved the problem. This confirms the BCM memory corruption issue is the most common cause after a battery event.

OEM Part Supersession History

• 13594646 → 13524922, 13534188 — Part revision or manufacturer change for the Body Control Module (BCM).
  Heads up: BCMs are vehicle-specific and require programming (including VIN writing) with GM's SPS software to function. Always verify the correct part number for your specific VIN.
• 13594587 → 13534186 — Part revision for the Body Control Module (BCM).
  Heads up: This BCM fits multiple GM vehicles from this era. Programming is mandatory.

Model Year Variations Within This Range

• 2022-2024: The Buick Enclave received a mid-cycle refresh for the 2022 model year. This included revised front and rear styling, new LED headlights and taillights, a restyled center console with an electronic push-button shifter, a new steering wheel, and standard wireless Apple CarPlay/Android Auto. While the core immobilizer logic is the same, changes to the center console and BCM software could present minor differences in diagnostics or disassembly compared to 2018-2021 models.