2009-2011 Acura TL SH-AWD Differential Control Module: Diagnosis and Replacement
This guide covers the common failures, diagnostic steps, and replacement considerations for the electronic control module governing your Acura's Super Handling All-Wheel Drive system.
- This module (48310-RK7-003) ONLY fits 2009-2011 TL models with both SH-AWD and an Automatic Transmission.
- The 'Check SH-AWD System' light is often caused by other issues, like a weak battery or an engine fault, not the module itself. Always diagnose these first.
- Programming is generally not required, but a post-installation 'initialization' with a scan tool may be needed for the system to function correctly.
- A used OEM module is a viable, cost-effective option, but you must verify the part number and inspect for corrosion before buying.
Compatibility Warning
Important: This Differential Control Module, part number 48310-RK7-003, is specifically for 2009-2011 Acura TL models equipped with both an Automatic Transmission and the Super Handling All-Wheel Drive (SH-AWD) system. It will not fit Front-Wheel Drive (FWD) models or vehicles with a Manual Transmission, which use a different part number. Always verify the part number on your original module before purchasing a replacement.
Symptoms of a Failing Differential Control Module
Failure of the SH-AWD Differential Control Module often presents clear and specific symptoms. However, it's important to note that many other issues can trigger the same warning lights.
- "Check SH-AWD System" Warning Light: This is the most common and direct symptom. A message will appear on the multi-information display, and the SH-AWD indicator will illuminate on the instrument cluster. When this light is on, the all-wheel-drive system is disabled as a safety measure.
- Vehicle Defaults to Front-Wheel Drive: With the SH-AWD system disabled, the car will operate exclusively in front-wheel drive. This may result in a noticeable change in handling, especially in slippery conditions or during hard cornering.
- Diagnostic Trouble Codes (DTCs): A professional scan tool is required to read codes from the SH-AWD module. Codes may relate to sensor inputs, communication errors, or internal module failures.
Diagnosing the "Check SH-AWD System" Light
While the Differential Control Module can fail, the "Check SH-AWD System" light is often triggered by other, more common problems. Acura designed the system to disable itself whenever certain engine, emissions, or electrical faults are detected. Before condemning the control module, investigate these related issues first.
🎬 Watch: Common causes and quick fixes for the SH-AWD light- Check Battery and Charging System: A weak battery, loose or corroded terminals, or a failing alternator can cause voltage drops that trigger multiple, seemingly unrelated warning lights, including the SH-AWD light. This is a very common cause and should be the first thing you check. Ensure the alternator is producing between 13.5 and 14.5 volts.
- Scan for All Trouble Codes: Use a scanner that can read codes from all vehicle modules, not just the engine computer. An emissions-related code (like from a faulty oxygen sensor or loose gas cap) or an ABS code will often disable the SH-AWD system by design. Fixing the primary code will often resolve the SH-AWD light.
- Check SH-AWD Fluid: While less common, a blinking SH-AWD light can indicate the differential fluid is overheating. A solid light can sometimes be triggered by low fluid levels. It's wise to check for leaks and ensure the fluid level is correct.
- Inspect Wiring: Check the wiring harness and connectors leading to the control module (located in the trunk) and the rear differential itself. Look for any signs of corrosion, damage, or loose connections.
Buying a Used Differential Control Module
A used OEM module is often a reliable and cost-effective alternative to an expensive new part. Here’s what to look for when buying a used unit.
- Verify the Part Number: The only way to ensure compatibility is to match the part number exactly. For the 2009-2011 TL with SH-AWD and an automatic transmission, the correct part number is 48310-RK7-003.
- Programming and Initialization: Most sources indicate that Honda and Acura modules come pre-programmed and do not require traditional programming after installation. However, some sellers of used modules state that reprogramming is necessary. While it is unlikely for this specific module, some sources suggest an initialization procedure with a capable scan tool may be required after replacement to ensure it communicates correctly with the vehicle's other systems. It is best to assume an initialization procedure may be needed. 🎬 See how to relearn the differential module after replacement
- Physical Inspection: The module is located in the trunk area. When inspecting a used module, check the casing for any cracks or signs of being opened. Most importantly, inspect the connector pins for any corrosion or water damage, which could indicate a trunk leak in the donor vehicle.
- Source and Warranty: Purchase from a reputable seller that offers a warranty and a clear return policy. This protects you in case the module is faulty or incompatible.
Pro Tip: The module is located in the right-rear of the trunk, behind the liner. Accessing it is straightforward, typically requiring only the removal of trunk floor coverings and plastic trim clips.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM | $545 - $825 |
| Used OEM | $50 - $150 |
| Shop Labor for Replacement | $90 - $150 |
Known Issues, TSBs, and Recalls
As of this writing, there are no specific recalls or Technical Service Bulletins (TSBs) from Acura or the NHTSA that directly address the failure of the Differential Control Module itself for the 2009-2011 TL. However, there are several recalls for Takata airbag inflators and a warranty extension related to the torque converter that may affect these vehicles. It is always recommended to check for open recalls using the vehicle's VIN.
Frequently Asked Questions (FAQ)
Does the 2009-2011 Acura TL Differential Control Module need to be programmed?
Generally, new Honda and Acura modules come pre-programmed from the factory and do not require VIN-specific programming. However, after installation, an initialization or calibration procedure using a professional-grade scan tool may be necessary to synchronize the new module with the vehicle's VSA (Vehicle Stability Assist) and other systems.
Where is the differential control module located?
The SH-AWD Differential Control Module is located in the trunk of the vehicle, typically on the right (passenger) side behind the trunk liner.
Can I drive my Acura TL with a bad differential control module?
Yes, but with limitations. When the module fails, the "Check SH-AWD System" light will come on, and the system will be disabled, reverting the car to front-wheel drive. While the car is safe to drive for normal commuting, you will not have the benefit of all-wheel drive, which will reduce traction on slippery roads and change the car's handling characteristics during spirited driving.
Could a weak battery really cause the SH-AWD light to come on?
Yes, absolutely. This is one of the most common causes for the SH-AWD light across many Acura models. Low system voltage during startup or driving can cause communication errors between modules, leading the SH-AWD system to disable itself as a precaution. Always test the battery and charging system before assuming a more expensive component has failed.
Helpful Videos
Technical Specifications
OEM Part Numbers: 48310-RK7-003
Controls electromagnetic clutches in the rear differential for torque vectoring.
We Have This Part in Stock
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.
- Acura TL: