2022 Eclipse Cross AWD Service Light - Differential Fluid?

ClearTheCode admin answer:

An 'AWD Service Required' message on your 2022 Mitsubishi Eclipse Cross SEL, especially with the S-AWC (Super All-Wheel Control) system, is definitely something to pay attention to, even if you're not noticing immediate driving issues. This light indicates that the vehicle's computer has detected a fault within the AWD system.

Possible Causes for 'AWD Service Required' Light:

• Fluid Degradation/Low Level: The most common cause for scheduled maintenance. The S-AWC system relies on various fluids:
  • Front Differential Fluid: Lubricates the gears in the front differential.
  • Transfer Case Fluid: Transmits power from the transmission to the rear driveshaft.
  • Rear Differential Fluid: Lubricates the gears in the rear differential.
• Sensor Malfunction: Issues with wheel speed sensors, yaw rate sensors, or other S-AWC related sensors.
• Actuator/Pump Issues: Problems with the hydraulic pump or actuators that control power distribution.
• Wiring or Electrical Faults: Damaged wiring or connectors within the AWD system.
• Control Module Issues: Less common, but a fault in the S-AWC control module.

When to See a Shop: While the vehicle might seem to drive fine, the AWD system may not be functioning optimally, especially in situations where it's needed (e.g., slippery conditions, hard cornering). It's best to have this checked out relatively quickly. If you experience any strange noises, vibrations, or loss of traction, pull over safely and contact a tow service. A professional can connect to the vehicle's diagnostic port to retrieve specific fault codes related to the S-AWC system.

DIY Considerations and Recommendations:

1. Check Service Intervals: For your 2022 Eclipse Cross, Mitsubishi generally recommends inspection of the differential and transfer case fluids around 15,000-30,000 miles, with replacement typically every 30,000 miles or sooner under severe driving conditions. At 30,000 miles, a fluid service is highly recommended and could be the cause of the light.
2. Recommended Fluids:
   • Front Differential: Often uses the same fluid as the manual transmission or a specific gear oil (e.g., API GL-5 SAE 75W-90).
   • Transfer Case: Typically requires a specific gear oil, often Mitsubishi DiaQueen LSD Gear Oil (API GL-5 SAE 90) or equivalent.
   • Rear Differential: Also typically requires Mitsubishi DiaQueen LSD Gear Oil (API GL-5 SAE 90) or equivalent.
   • Always consult your owner's manual for the exact fluid specifications for your specific trim and model year, as these can vary. Using the wrong fluid can cause damage.
3. Visual Inspection: While you might not be able to check fluid levels easily without a lift, you can visually inspect for any obvious leaks around the differentials or transfer case.
4. Diagnostic Scan: Even if you don't have a professional scanner, a basic OBD-II scanner might pull generic powertrain codes, but a Mitsubishi-specific scanner is needed for detailed S-AWC codes.

Addressing the 'AWD Service Required' light promptly ensures your S-AWC system functions correctly and prevents potential wear or damage to expensive components.