2022-2025 Honda Passport AWD Control Module: Diagnosing i-VTM4 System Problems
This guide explains the function of the AWD Control Module in the Honda Passport's i-VTM4 system, common symptoms of failure, and critical programming information for replacement.
- The 2022-2025 Passport uses an i-VTM4 AWD system, not a traditional transfer case. The part is an AWD Control Module.
- Replacement modules MUST be initialized by a dealer or qualified shop using Honda-specific software (HDS). It is not a DIY job.
- The "AWD System Problem" light is often caused by a corroded wiring connector (C125) near the rear differential, not a failed module.
- Driving is possible with a failed module, but the vehicle will be in front-wheel drive only, reducing safety in poor conditions.
Understanding the i-VTM4 AWD System in Your Passport
The 2022-2025 Honda Passport is equipped with a sophisticated all-wheel-drive system known as i-VTM4® (Intelligent Variable Torque Management). Unlike older 4WD systems that use a single transfer case to engage the front and rear axles, the Passport's system is more complex and intelligent. The heart of the system is a rear drive unit containing two clutch packs, one for each rear wheel. The AWD Control Module acts as the system's computer, deciding precisely how much power to send to each individual rear wheel. This ability to vector torque not only provides excellent traction in bad weather but also improves cornering and stability even on dry roads.
Symptoms of a Failing AWD Control Module
A problem with the AWD Control Module or a related component will typically trigger a warning message on the dashboard.
- "AWD System Problem" Warning Light: This is the most common indicator of a fault within the i-VTM4 system. The light may come on intermittently at first, perhaps during rain or after a car wash, before staying on permanently.
- Loss of All-Wheel Drive: The vehicle will revert to front-wheel drive (FWD) operation, which can be especially noticeable and dangerous in slippery conditions. You may experience a significant decrease in traction.
- Hesitation or Delayed Acceleration: Some owners report a hesitation or delay in acceleration when the AWD warning light appears, as the vehicle's computer systems adjust to the fault.
- Diagnostic Trouble Codes (DTCs): A professional scan tool may reveal specific codes stored in the vehicle's memory. Common codes related to the AWD system can include C1870, C1841, C1851, or C1855, pointing to issues with communication, sensors, or the rear differential's electric pump motor.
Important: Many symptoms related to the AWD system are not caused by the control module itself. A common point of failure is the C125 electrical connector for the rear differential's oil pump, which is prone to water intrusion and corrosion. This can cause a loss of communication that mimics a failed module. Always have this connector inspected before condemning the control module.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no specific recalls or widespread Technical Service Bulletins (TSBs) for the AWD Control Module on the 2022-2025 Honda Passport. However, related components have been subject to service actions.
- TSB A24-048: This bulletin addresses the "AWD System Problem" warning light on 2019-2022 Passports (and other Honda models) caused by water intrusion at the C125 connector, leading to corrosion. The fix involves a new wire harness and pump motor. While this TSB doesn't cover the 2023-2025 models, the issue highlights a known vulnerability in the system's wiring.
- Rear Subframe Corrosion Recall: A recall was issued in June 2026 for potential corrosion of the rear subframe on Passports from 2019-2023 sold or operated in salt-belt states. While not directly an electronics issue, severe corrosion in this area could potentially affect nearby wiring or components.
Owners can check for the latest recall information on the NHTSA website.
CRITICAL: Programming and Installation
Replacing the AWD Control Module is not a simple plug-and-play task. While many new Honda modules come pre-programmed from the factory, they often require an 'initialization' or 're-learning' procedure to sync with the vehicle's other systems. This process must be performed using a Honda-specific diagnostic tool, like the Honda Diagnostic System (HDS) or a compatible J2534 pass-thru device with a software subscription. Failure to perform this step can result in the new module not functioning correctly, leaving the AWD system inoperative.
Pro Tip: Due to the requirement for specialized tools and software, installation of a replacement AWD Control Module is best left to a dealership or a qualified independent shop that has the proper Honda diagnostic equipment. A standard OBD-II code reader cannot perform the necessary initialization procedures.
Buying a Used 2022-2025 Passport AWD Module
Purchasing a used AWD Control Module can offer significant savings over a new part. However, it's crucial to buy smart to ensure compatibility and functionality.
- Verify the Part Number: The most critical step is to match the part number exactly. Even a single digit difference can mean the module is for a different trim level or has different software. The part number is printed on the label of the module itself.
- Inspect for Damage: Check the used module for any signs of physical damage, especially at the connector pins. Look for corrosion (green or white crust), bent pins, or cracks in the housing. A module with any connector damage should be avoided.
- Source from a Reputable Supplier: Buy from a seller that offers a warranty and has a good return policy. This protects you in case the module is defective or incompatible.
- Understand the Programming Needs: Remember that even a used module will need to be initialized to your vehicle by a professional with the right tools. Factor in this additional cost when considering a used part.
Replacement Cost Comparison
Prices can vary by supplier and location. The following are estimates as of mid-2026.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Dealer) | $450 - $650 (Part only) |
| New Aftermarket | Not commonly available |
| Used OEM | $75 - $200 |
| Shop Labor (Installation & Programming) | $120 - $250 |
Frequently Asked Questions (FAQ)
Does a replacement AWD Control Module need to be programmed?
Yes, a replacement module—whether new or used—must be initialized to the vehicle using Honda's HDS software or a compatible J2534 tool. This is not something a DIY mechanic can typically do without the expensive, specialized equipment.
Can I drive my Passport with a bad AWD module?
Yes, but with limitations. The vehicle will likely operate in front-wheel drive only. This reduces traction and stability, especially in rain, snow, or on loose surfaces. It is recommended to have the system repaired promptly for safety.
Is the AWD Control Module the same as the ECU?
No. The AWD Control Module specifically manages the all-wheel-drive system. The Engine Control Unit (ECU) or Powertrain Control Module (PCM) is the main computer that manages the engine and transmission. The two modules communicate with each other, but they are separate parts.
My mechanic says I need a new rear differential. Could it just be the module?
It's possible, but it's more likely that the issue is with the wiring to the differential, not the module or the differential itself. A very common failure point is the C125 electrical connector, which corrodes and causes communication loss. This is a much cheaper repair than a full differential or module replacement, so it should always be the first thing checked when an "AWD System Problem" light appears.
Technical Specifications
OEM Part Numbers: 38990-R9S-A04 37820-RLV-B43 37820-RLV-B42 39200-TGS-A11
Controls the i-VTM4 (Intelligent Variable Torque Management) all-wheel-drive system. Manages two electro-hydraulic clutch packs in the rear differential for independent rear-wheel torque vectoring.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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- Understanding the i-VTM4 AWD System in Your Passport
- Symptoms of a Failing AWD Control Module
- Known Issues, TSBs, and Recalls
- CRITICAL: Programming and Installation
- Buying a Used 2022-2025 Passport AWD Module
- Replacement Cost Comparison
- Frequently Asked Questions (FAQ)
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