B2409 on 2018-2020 Nissan Pathfinder: Automatic Back Door Module Failure Causes and Fixes

What's Unique About the 2018-2020 Nissan PATHFINDER

This is a well-documented problem on the fourth-generation (R52) Pathfinder. Nissan acknowledged a high failure rate for this specific part by issuing TSB NTB20-050, which directs technicians to replace the module as the primary fix for vehicles built before October 11, 2019. Unlike many electrical issues that start with checking wires and switches, the diagnosis for B2409 on these vehicles is unusually direct. The control module is located in the rear cargo area on the driver's side, where some owners speculate it may be susceptible to failure from moisture or temperature changes. The issue is also documented for the Nissan Rogue 🎬 Watch: How to troubleshoot similar liftgate issues on a Nissan Rogue and the platform-mate Infiniti QX60.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice

• Power liftgate (automatic back door) does not open or close.
• Power liftgate is inoperative from the dashboard switch.
• Power liftgate does not respond to the Intelligent Key fob button.
• Power liftgate does not work using the request switch on the liftgate itself.
• Kick-to-open motion sensor does not activate the liftgate.
• Liftgate operates intermittently, stops mid-travel, or reverses on its own.
🎬 Watch: A quick overview of the Pathfinder power liftgate features
• A series of beeps may be heard when attempting to operate the liftgate, which then fails to open or close.

Most Likely Causes

1. Failed Automatic Back Door Control Module 🔴 High Probability Nissan TSB NTB20-050 was issued for this specific failure on Pathfinders built before October 11, 2019, indicating a known component defect. The earlier version of the module was reportedly more vulnerable to electrical issues or failure from moisture and temperature swings.
   How to confirm: Scan the BCM for code B2409. If the code is present and symptoms match, the TSB identifies the module as the point of failure. The module is located behind the trim panel in the rear driver's side of the cargo area.
   Typical fix: Replace the Automatic Back Door Control Module with the updated part number specified in the TSB. The new module must be programmed to the vehicle.
   Est. part cost: $300-$500

Rare But Worth Checking

• Wiring Harness Damage: While the module is the most likely cause, it's worth visually inspecting the wiring harness that passes from the body to the liftgate (in the flexible rubber boot) for any chafing or broken wires, as this is a common stress point on any vehicle with a hatch.
• Faulty Liftgate Request Switch: If only one switch (e.g., the one on the liftgate) fails to work while others do, the switch itself could be the problem. However, B2409 typically indicates a module fault that disables all switch inputs. Water intrusion can also damage the external switch, 🎬 See how to replace the liftgate request button yourself causing it to fail without setting a B2409 code.
• Failing Liftgate Struts: Weak power liftgate struts can cause the system to struggle and abort the opening/closing process. This usually doesn't set code B2409 but can present similar symptoms, like the gate opening partially and then stopping or reversing.

Diagnosis Steps

1. Connect an OBD-II scanner capable of reading Nissan B-codes to the vehicle.
2. Scan the Body Control Module (BCM) for stored or current trouble codes.
3. Confirm that code B2409 is present.
4. Verify the symptoms: test the power liftgate function from the dash switch, key fob, and rear request switch.
5. Consult Nissan TSB NTB20-050 to confirm the vehicle falls within the affected range (Pathfinders built before Oct 11, 2019).
6. Following the TSB's guidance, the primary diagnosis is a failed Automatic Back Door Control Module.
7. As a secondary check, locate the module behind the interior trim panel in the rear driver's side cargo area. Inspect the module and its connectors for any signs of water damage or corrosion.
8. Visually inspect the wiring harness near the liftgate hinges for any obvious damage.
9. Replace the Automatic Back Door Control Module.
10. Have the new module programmed by a Nissan dealer or qualified shop using a CONSULT-III plus tool.

Parts You'll Likely Need

• Automatic Back Door Control Module (OEM #284G4-3KA9B (replaces 284G4-3KA9A for 2019-2020), 284G4-3KA8B (for 2018)) — This is the component identified by Nissan as the direct cause of the B2409 fault in TSB NTB20-050. The part numbers were updated to a more reliable version.
  Trusted brands: Nissan (Genuine OEM)
  OEM price range: $300-$500
  Aftermarket price range: Not commonly available

Technical Service Bulletins (TSBs) & Recalls

• NTB20-050: States that if the power back door is inoperative and DTC B2409 is stored, the fix is to replace the automatic back door control module. It provides specific part numbers for affected Pathfinder and Rogue models.
• ITB20-018: An Infiniti TSB for the 2018-2020 QX60 describing the exact same symptoms, B2409 code, and fix (module replacement), confirming this is a platform-wide issue.

Platform-Specific Known Issues

• A known issue documented in Nissan TSB NTB20-050 affects 2018-2020 Pathfinders built before October 11, 2019, where the power back door becomes inoperative and stores code B2409 due to a faulty control module.
• The Infiniti QX60, which shares a platform with the Pathfinder, has a similar TSB (ITB20-018) for the same B2409 code and liftgate failure, pointing to a shared component design flaw.

Scan Tool Commands That Help

• CONSULT-III plus: Work Support for Automatic Back Door — The CONSULT-III plus software allows for active tests and reprogramming of the Automatic Back Door Control Module. This is used to confirm the new module is communicating correctly with the BCM and to initialize it after replacement, as per TSB NTB20-050.
• CONSULT-III plus: READ CONFIGURATION / WRITE CONFIGURATION — When replacing the BCM or related body modules, the vehicle's configuration must be read from the old module and written to the new one. While B2409 points to the liftgate module, if broader issues were suspected with the BCM, this function would be critical.

Wiring & Ground Locations

• B19 — Located in the left rear of the cargo area.. This is a primary body ground point near the Automatic Back Door Control Module. A poor connection at this ground could potentially cause erratic behavior or failure of the module, although the TSB points directly to internal module failure. Verifying this ground is clean and tight is a good secondary check.
• B46 — This is the connector identifier for the Automatic Back Door Control Module.. Technicians needing to perform pinout tests for power, ground, or CAN signals at the module would reference connector B46 in the service manual wiring diagram.
• B27 / B28 — Located behind the left rear quarter panel.. These are additional ground points in the vicinity of the liftgate module. While B19 is more directly associated, checking these grounds is part of a thorough diagnosis for any electrical issue in the rear of the vehicle.

Real Owner Repair Stories

• Nissan Forum user 'M@ryland' (2013 Infiniti JX35 (platform-mate to Pathfinder)) — After a battery change, the power liftgate would not operate from the key fob, dash button, or liftgate button. It could only be opened manually from the inside latch.
  ❌ Tried (didn't work) Checking all fuses in the interior and engine bay fuse boxes., Dealer diagnosed a bad liftgate lock actuator, but the owner tested it with a 9V battery and found it worked.
  ✅ What actually fixed it Disconnecting the vehicle's main battery for 15 minutes. This reset the liftgate control module and resolved the problem completely.

OEM Part Supersession History

• 284G4-3KA9A → 284G4-3KA9B — This is the updated, more reliable part specified in TSB NTB20-050 for 2019-2020 Pathfinders to resolve the B2409 fault.
• N/A → 284G4-3KA8B — This is the specific part number designated for the 2018 Pathfinder model year according to TSB NTB20-050.
  Heads up: This part is specific to the 2018 model and should not be confused with the part for 2019-2020 models.

Model Year Variations Within This Range

• 2018 vs 2019-2020: The OEM part number for the Automatic Back Door Control Module is different. The 2018 model uses part number 284G4-3KA8B, while the 2019-2020 models use the updated part 284G4-3KA9B.