C1411 on 2023-2025 Subaru Legacy: VDC Control Module Fault Causes & Fixes

What's Unique About the 2023-2025 Subaru LEGACY

Unlike many chassis codes that point to a failed sensor, C1411 on this specific generation of Subaru Legacy is most frequently a software issue. Subaru identified a logic flaw that could cause 'VDC memory corruption' and issued service bulletin #06-96-25 to fix it by reprogramming the module. This makes a trip to the dealer for a software update the most common solution, rather than an expensive hardware replacement. This pattern of software fixes for VDC faults has been seen on other Subaru models as well, such as the Crosstrek.

Diagnostic Flowchart

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

Symptoms You May Notice

• ABS warning light on
• Vehicle Dynamics Control (VDC) warning light on
• Brake system warning light on
• EyeSight driver assist system disabled message
🎬 Watch: How to troubleshoot EyeSight and Pre-Collision warning light issues.
• Electronic Parking Brake (EPB) may not operate
• Check Engine Light (CEL) may illuminate
• Hill Assist warning light on
🎬 See this guide on resolving EyeSight and Check Engine lights.

Most Likely Causes

1. VDC Module Software Requires Update 🔴 High Probability Subaru issued Technical Service Bulletin #06-96-25 specifically to address a logic flaw in the VDC module's software that causes this code on 2023-2025 Legacy models. The issue is described as 'VDC memory corruption'.
   How to confirm: A Subaru dealer or a shop with OEM-level diagnostic tools must check for C1411 accompanied by a '30A2 failure detail code'. The presence of this specific sub-code confirms the TSB reprogramming procedure is the correct fix.
   Typical fix: Reprogramming the VDC Hydraulic Control Unit with the updated software file provided by Subaru. This is a labor-only procedure, typically taking about 1 hour. The dealer will use a tool like the Subaru Select Monitor and a battery maintainer to ensure stable voltage during the flash.
   Est. part cost: $0
2. Failed VDC Control Module / Hydraulic Unit ⚪ Low Probability
   How to confirm: If the reprogramming procedure from TSB #06-96-25 fails to clear the code, or if the code returns immediately, the module itself likely has an internal hardware failure. This is confirmed when the module is unresponsive to the scan tool or reports an unrecoverable internal error after the software update attempt.
   Typical fix: The entire ABS/VDC hydraulic control unit assembly must be replaced, followed by a brake system bleed and programming of the new module to the vehicle. This is a very expensive repair, with dealer quotes for similar models reaching over $3,000.
   Est. part cost: $1500-$2500

Rare But Worth Checking

• Low System Voltage or Poor Connection: Extremely low battery voltage during startup can sometimes cause electronic modules to set internal fault codes like C1411 and C1942 (Power Supply Voltage). Before condemning an expensive module, ensure the battery and charging system are healthy and check that the main connector to the VDC module is clean and secure. Subaru specifically warns that control module failures from battery discharge during reprogramming are not covered by warranty.

Diagnosis Steps

1. Connect a Subaru-compatible diagnostic scan tool to the vehicle.
2. Scan the Vehicle Dynamics Control (VDC) system for codes. Confirm C1411 is active.
3. Check for a '30A2 failure detail code' as specified in TSB #06-96-25.
4. If C1411 and the 30A2 detail code are present, the vehicle requires the VDC module reprogramming procedure at a Subaru dealership or qualified independent shop with reprogramming capabilities.
5. Before reprogramming, verify the vehicle's battery is fully charged and connect a stable power supply (e.g., Midtronics DCA-8000) to maintain at least 13.5 volts.
6. If the reprogramming fails or the code returns, inspect the VDC module's wiring harness and connector for damage, corrosion, or loose pins.
7. If the wiring is confirmed to be good and the software is up to date, the VDC hydraulic control unit has likely failed and requires replacement.
8. After replacement, the new module must be programmed to the vehicle's VIN and the brake system must be properly bled using a scan tool to cycle the ABS pump.

Parts You'll Likely Need

• ABS/VDC Hydraulic Control Unit Assembly (OEM #27596AN02A) — This part is only needed if the software reprogramming does not fix the code, indicating a true hardware failure. It contains the electronic control module 🎬 Watch: How to replace the ABS control unit without bleeding fluid. and the hydraulic pump/valve body for the ABS and VDC systems. Part numbers for this generation often begin with 'AN' and are not interchangeable with the previous 'AL' generation.
  Trusted brands: Subaru (OEM)
  OEM price range: $375-$550
  Aftermarket price range: $N/A

Related Codes That Often Appear With This One

• 30A2 (Detail Code) — This is a manufacturer-specific failure detail code, not a standard OBD-II code. When seen with C1411 on a 2023-2025 Legacy, it is the specific trigger for performing the reprogramming procedure outlined in TSB #06-96-25.
• C1422 — This code often indicates that the Engine Control Module (ECM) has flagged a failure in the VDC system. It frequently appears alongside C1411 when the VDC module reports an internal fault.

Technical Service Bulletins (TSBs) & Recalls

• 06-96-25: Addresses DTC C1411 with a 30A2 failure detail code by providing a reprogramming file for the HYDRAULIC UNIT ASSEMBLY(VDC).
• WRC-23: A service program for 2019-2023 Crosstrek PHEVs to reprogram the VDC module for the same C1411 'memory corruption' issue, showing a pattern of this fault.

Platform-Specific Known Issues

• A documented software logic issue exists for 2023-2025 models that can falsely trigger the C1411 code. Subaru addressed this with Technical Service Bulletin #06-96-25, which provides a software update for the VDC module.
• This issue is part of a broader pattern for Subaru, with a similar reprogramming campaign (WRC-23) issued for the Crosstrek PHEV to fix C1411 caused by 'VDC memory corruption'.

Mechanic-Grade Diagnostic Values

• VDC Module Power Supply Voltage — expected: 10 - 15 V. Failure: Voltage below 10V or absent.
• VDC Module Valve Relay Power Supply — expected: 10 - 15 V. Failure: Voltage below 10V or absent.
• VDC Module Motor Relay Power Supply — expected: 10 - 15 V. Failure: Voltage below 10V or absent.
• Reprogramming Stable Voltage — expected: 13.5 V. Failure: Voltage rising above 14V during the procedure will cause it to abort.

Hidden / Shadow Codes Worth Checking

• 30A2 (Detail Code): A manufacturer-specific failure code indicating the specific internal logic error ('VDC memory corruption') that the TSB #06-96-25 reprogramming is designed to fix. (see via This code is visible using the Subaru Select Monitor (SSM) or an equivalent high-level diagnostic scan tool when checking the VDC system. It is not a standard OBD-II code.)

Scan Tool Commands That Help

• Subaru Select Monitor (SSM): FlashWrite (Reprogramming) — This is the primary repair procedure for C1411 with detail code 30A2, as outlined in TSB #06-96-25. It updates the module's flawed software logic.
• Subaru Select Monitor (SSM): Parameter Selection / Registration — This function is mandatory after replacing the VDC Control Module (VDCCM&H/U). It codes the new module to the vehicle's specific configuration (e.g., with/without EyeSight). Failure to perform this step will result in a new DTC for 'Parameter selection error'.
• Subaru Select Monitor (SSM): ABS Sequence Control / VDC Check Mode — These are bidirectional tests used to verify the functionality of the hydraulic unit. The command forces the tool to operate the internal valves and ABS pump motor, which helps diagnose a suspected hardware failure or bleed the system after replacement.
• Subaru Select Monitor (SSM): VDC Sensor Midpoint Setting Mode — This calibration is required after replacing the VDC module, steering angle sensor, or suspension components. It establishes the zero point for the steering angle and lateral G sensors, which is critical for stability control to function correctly.

Wiring & Ground Locations

• VDCCM&H/U (VDC Control Module & Hydraulic Unit) — Located in the engine bay. Access requires removing the air intake boot.. This is the location of the module itself. Physical inspection of its main connector for corrosion, moisture, or damage is a key diagnostic step if reprogramming fails.
• VDC Module Ground Bolt (GB-5) — While the exact location for the 2023+ Legacy is not specified in the search results, service manuals for similar platforms indicate a primary ground bolt for the VDC system on the chassis.. A loose or corroded main ground for the VDC module can cause intermittent low voltage conditions, potentially triggering internal fault codes like C1411 and C1942. Checking the torque and cleanliness of this ground is a critical step in ruling out simple wiring issues.
• CAN Bus Wiring — Runs between the VDC module, ECM, TCM, and other control units.. The CAN bus wires are a twisted pair. Damage to this wiring can interrupt communication between modules, leading to a variety of fault codes, including C1411. The VDC module is a component on the high-speed CAN bus.

Real Owner Repair Stories

• Reddit user rconway1991 (2016 Subaru Outback 2.5L) — Check engine, cruise, and traction control lights all on. Codes present included C1411 and C1942 (Power Supply Voltage).
  ❌ Tried (didn't work) Initial diagnosis pointed towards potential module failure.
  ✅ What actually fixed it The owner disconnected the battery, thoroughly cleaned corroded battery terminals, applied anti-corrosion grease, and reconnected the battery. The codes did not return.

OEM Part Supersession History

• 27596AN00A, 27596AN00B, 27596AN00C → 27596AN02A, 27596AN03A (example revisions) — Part revisions to address hardware or software updates over the model years.
  Heads up: Modules for the 2020+ Subaru Global Platform (part numbers typically starting with 'AN') are not interchangeable with modules from the 2019 and earlier generation (part numbers typically starting with 'AL').

Model Year Variations Within This Range

• 2023-2025: These models are built on the Subaru Global Platform and use a different series of ABS/VDC modules (typically 'AN' series part numbers) than the pre-2020 generation ('AL' series). The parts are not backward or forward compatible.