The 2018 Acura TLX's available SH-AWD (Super Handling All-Wheel Drive) system provides enhanced traction and cornering dynamics, but when malfunction warnings appear, the sophisticated system requires specialized diagnosis. Understanding SH-AWD helps identify appropriate repairs.
How SH-AWD Works
SH-AWD is more than simple all-wheel drive—it actively distributes torque between front and rear axles and between the left and right rear wheels. This torque vectoring capability improves handling by applying more power to the outside rear wheel during cornering. The rear differential contains electromagnetic clutches that control this distribution.
Common SH-AWD Issues
Rear differential fluid degradation affects clutch pack operation. Electromagnetic clutch wear reduces system responsiveness. Speed sensor failures at individual wheels prevent proper torque calculation. Control module issues disable or limit system function. Mechanical wear in the differential creates noise or functional problems.
Symptoms of SH-AWD Malfunction
Dashboard warning lights indicating AWD or SH-AWD fault. Reduced handling dynamics during spirited driving. Unusual noise from the rear differential area. Vehicle may feel like front-wheel drive if system defaults to safe mode.
Diagnostic and Service Approach
Retrieve SH-AWD specific codes using Honda/Acura diagnostic equipment. Check rear differential fluid level and condition—this service is often neglected. Test electromagnetic clutch operation through diagnostic commands. Inspect speed sensors at all four corners. For internal differential issues, specialized service is required.