When your 2015 Honda Crosstour displays an AWD system malfunction warning, the intelligent all-wheel drive system has detected a fault preventing normal operation. Understanding the Crosstour's Real Time AWD system helps identify what may be causing the malfunction and how to address it.
Crosstour AWD System Overview
The 2015 Crosstour's Real Time AWD uses an electronically-controlled coupling to distribute torque to the rear wheels when front wheel slip is detected. Under normal driving, power goes primarily to the front wheels for fuel efficiency. The system automatically engages the rear axle as needed, with no driver input required. When a malfunction is detected, the system defaults to front-wheel drive only.
Common Causes of AWD Malfunction
The rear differential fluid is critical—Honda's dual-pump fluid (DPF II) contains additives specifically for the electromagnetic clutch. Degraded or low fluid causes engagement problems. Wheel speed sensor discrepancies from mismatched tires, different tire pressures, or sensor failures trigger warnings. The electromagnetic clutch in the rear differential can fail. Wiring damage between the body and rear differential is common from road debris exposure.
Diagnostic Process
Begin by checking for DTCs using a Honda-compatible scanner that can access body and chassis modules. Common codes relate to wheel speed sensor inputs, rear differential clutch circuits, or communication errors. Check all four tires for matching size and similar tread depth—even a full-size spare of different size can trigger the warning. Verify tire pressures are equal across all four corners.
Fluid Inspection
The rear differential fluid level and condition significantly affect AWD operation. Locate the fill/level plug on the rear differential and check the fluid level—it should reach the bottom of the fill hole. The fluid should be clear to light brown; dark, burnt-smelling fluid needs replacement. Honda recommends DPF II fluid inspection at 30,000 miles with replacement if needed, and mandatory replacement at 60,000 miles for vehicles in severe service.
Repair Costs
Rear differential fluid service costs $80-$150 and may resolve issues caused by degraded fluid. Wheel speed sensor replacement runs $150-$300 per sensor. If the electromagnetic clutch has failed, repair can reach $800-$1,400 for the clutch pack or more if the entire differential unit needs replacement. Wiring harness repair varies based on damage extent but typically costs $200-$400.