U2013 on 2021-2024 Ford Bronco: Door Module Communication and Fixes

What's Unique About the 2021-2024 Ford BRONCO

The Ford Bronco's removable doors necessitate a robust but complex electrical connection between the door and the vehicle body. This design appears to be sensitive, with issues often arising from software glitches rather than hard part failures. Ford has acknowledged this by issuing Technical Service Bulletins (TSBs) that recommend a software update as the primary fix, highlighting a platform-specific vulnerability in the door control module's programming. The modules themselves are located in the kick panels, not the doors, to report when doors are removed, which adds to the system's complexity.

Diagnostic Flowchart

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

Symptoms You May Notice

• Driver's window switch is inoperative or works intermittently
• Inability to open or close one or more windows
• Power mirrors cannot be adjusted
• Power-folding mirrors will not fold or unfold
• Window does not drop slightly when opening the door (window flop), causing it to catch on the weatherstripping or seal.
• Check Engine Light or other warning messages on the instrument cluster may be present.

Most Likely Causes

1. Door Control Module Software Glitch 🔴 High Probability → Shop Body Control Module Ford has released multiple TSBs (SSM 52839, SSM 53019) specifically advising a software update for this issue, indicating it's a known programming bug affecting both the Bronco and 2024 Ranger.
   How to confirm: A Ford dealer or a shop with the Ford Diagnostic and Repair System (FDRS) can check the current software version of the Driver Door Module (DDM) and Passenger Door Module (PDM) and see if an update is available as per the TSBs.
   Typical fix: Reprogram the affected door module(s) to the latest software level using the FDRS scan tool. This is a warrantable repair under NVLW and other plans. The process involves connecting the tool and running the module reprogramming function.
   Est. part cost: $0
2. Faulty Driver Window Switch (Master Switch Pack) 🟡 Medium Probability The master switch pack is the central command for all windows and mirrors. If its internal electronics or LIN bus communication fails, it can disrupt the entire door module's operation, mimicking the software fault.
   How to confirm: If a software update doesn't resolve the issue, a technician would follow Workshop Manual (WSM), Section 501-11 for diagnostics, which involves testing the switch inputs. Swapping with a known-good switch is another definitive step.
   Typical fix: Replace the driver's side master window switch assembly. The part number varies by 2-door vs 4-door and trim level.
   Est. part cost: $100-$200
3. Wiring or Connector Issue ⚪ Low Probability The design of the removable doors means the main electrical connector is frequently handled. 🎬 Watch: Ford's official guide to proper door and connector handling. Improper disconnection or reconnection can lead to bent pins, corrosion, or a loose connection. There are multiple forum reports of connectors being damaged even from the factory.
   How to confirm: Visually inspect the door harness connectors (C510 for driver, C610 for passenger) on both the door and A-pillar for any bent, corroded, or pushed-out pins. A multimeter would be used to check for continuity and shorts in the wiring harness if the connector appears fine. The door module relies on a shorting bar between pins 7 and 8 in the connector to detect when the door is off; a failure in this mechanism can also cause faults.
   Typical fix: Repair the damaged wiring or replace the affected connector pins. In severe cases, the door wiring harness may need replacement. Some owners have had this repair covered under warranty.
   Est. part cost: $5-$500

Rare But Worth Checking

• Faulty Door Control Module (DDM/PDM): → Shop Body Control Module

Diagnosis Steps

1. Scan the Driver Door Module (DDM) and Passenger Door Module (PDM) for codes. Confirm the presence of U2013:23 and B1087:87.
2. Connect the vehicle to the Ford Diagnostic and Repair System (FDRS).
3. Check for available software updates for the DDM and/or PDM under the 'SW Updates' tab.
4. If an update is available, reprogram the module(s) as per TSB SSM 53019. This is the most critical first step.
5. Clear all codes and test all window and mirror functions thoroughly. Perform a window initialization (holding the switch up/down for several seconds 🎬 See this quick walkthrough for the window relearn procedure.) if required.
6. If symptoms persist after the update, perform a close visual inspection of the door wiring harness connectors (Driver: C510, Passenger: C610) at the A-pillar for damage, bent pins, or corrosion. There are multiple owner reports of these connectors being damaged.
7. If wiring is intact, follow the diagnostic procedures in Workshop Manual (WSM), Section 501-11, which may lead to testing and potential replacement of the master window switch.
8. As a last resort, if all other diagnostics fail, the door module itself may be faulty. A new module requires a 'Programmable Module Installation' (PMI) procedure using FDRS.

Parts You'll Likely Need

• Driver Window Switch / Master Switch Pack (OEM #M2DZ-14529-BB (example for 2-door, varies by model)) — If a software update doesn't fix the problem, the internal electronics of the switch pack are the next most likely point of failure.
  Trusted brands: Motorcraft, Ford
  OEM price range: $150-$250
  Aftermarket price range: $80-$150

Related Codes That Often Appear With This One

• B1087:87 — This code, for 'LIN Bus 'A' - Missing Message', is almost always present with U2013 on the Bronco. TSBs 53019 and 52839 list both codes together as being caused by the same software issue in the DDM/PDM.

Technical Service Bulletins (TSBs) & Recalls

• SSM 53019: Addresses inoperative door window switches and mirrors with DTCs B1087:87 and/or U2013:23, recommending a module reprogram. It also lists the causal part number for warranty claims as 14B291.
• SSM 52839: A previous version of the same bulletin with the same recommendation for inoperative window switches and associated DTCs, confirming the issue affects 2021-2024 Bronco and 2024 Ranger.

Platform-Specific Known Issues

• A known software issue requires a module reprogram as the first and most common fix, as documented in Ford TSBs SSM 52839 and SSM 53019.
• Owners on forums like Bronco6G report frequent issues with the window auto-drop feature ('window flop'), which is related to the same door control modules. A software update has been reported to fix this as well.
• The main door electrical connectors are a known weak point. Owners report finding them damaged from the factory or having difficulty with alignment, leading to bent pins and electrical issues.

Scan Tool Commands That Help

• Ford Diagnostic and Repair System (FDRS): Module Reprogramming — This is the primary function used to apply software updates to an existing, installed module (DDM/PDM) as recommended by Ford TSBs 53019 and 52839 to fix the U2013 code.
• Ford Diagnostic and Repair System (FDRS): Programmable Module Installation (PMI) — This function is used only when a module is physically replaced with a new one. It configures the new, blank module to the vehicle's specifications. Using this on an existing module is incorrect for this specific repair.

Wiring & Ground Locations

• C510 — Driver's side A-pillar, connects the main body harness to the driver's door harness.. This is the main electrical connector for the Driver Door Module (DDM) and master window switch. It's a frequent point of failure due to bent or corroded pins from door removal/installation, directly causing communication codes like U2013.
• C610 — Passenger's side A-pillar, connects the main body harness to the passenger's door harness.. This is the main electrical connector for the Passenger Door Module (PDM). Damage to this connector can cause U2013 to be stored in the PDM.
• Kick Panel Grounds — Behind the kick panels in the driver and passenger footwells.. The DDM and PDM are located in the kick panels. A loose or corroded ground connection at these points can cause intermittent power and communication issues for the modules, potentially triggering a U2013 code. Forum users confirm these are accessible ground points.

Real Owner Repair Stories

• Bronco6G Forum User 'AmbyMc' (2021-2024 Ford Bronco (specific year not mentioned)) — Difficulty reinstalling doors by oneself, leading to potential damage.
  ❌ Tried (didn't work) Using the short, factory-provided alignment pin, which would disengage from the lower hinge while trying to align the upper hinge.
  ✅ What actually fixed it The user created a longer, custom alignment pin from an M8x1.25x45mm bolt by cutting the head off. This longer pin stayed engaged in the lower hinge, preventing misalignment and potential damage to the electrical connector pins during door installation.

OEM Part Supersession History

• M2DZ-14529-AB → R2DZ-14529-AB — Part number update or revision by the manufacturer.
  Heads up: M2DZ-14529-BB is for the 2-door model, while R2DZ-14529-AB (which supersedes M2DZ-14529-AB) is for the 4-door model. They are not interchangeable.

Model Year Variations Within This Range

• 2021-2024: The master window switch part number is different for 2-door and 4-door models. For example, M2DZ-14529-BB is listed for the 2-door Bronco, while R2DZ-14529-AB is for the 4-door model.