2005 Acura RL Problems: 1 Issues Every Owner Should Know
2005 model year · 780+ owner reports · Updated May 2026
According to Au7o's analysis of 780+ owner reports, the 2005 Acura RL has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is SH-AWD Torque Transfer Unit / Rear Differential Clutch Noise with 780 owner reports. Across all issues, repair costs range from $300 to $3,000. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2005-2012 Acura RL, the 2nd-gen RL's Super Handling All-Wheel Drive uses a torque transfer unit (TTU) at the transaxle output plus a rear differential containing electromagnetic clutch packs for variable side-to-side torque distribution. With age and fluid breakdown, both can develop a low-speed grinding or moaning noise — most often the rear unit's electromagnetic clutches when SH-AWD fluid is contaminated or below spec.
Common Symptoms
- Grinding noise from rear during turns
- Whining that increases with speed
- AWD system warning light illumination
- Clunking from rear during parking maneuvers
- Reduced traction in slippery conditions
How to Fix
Drain and refill the rear differential with Honda Dual Pump II fluid — do NOT use conventional gear oil. If noise persists after fluid change, the rear differential unit needs rebuilding with new clutch packs. Replace the electromagnetic actuators if they are not engaging properly. Regular fluid changes every 30,000 miles prevent premature clutch pack wear.
What Owners Are Using
Parts and tips from 780+ owners who fixed this issue
- TipChange the rear diff fluid to Honda Dual Pump II every 30,000 miles — this is the single most neglected maintenance item on the RL and the most common cause of SH-AWD noise. Most independent shops use the wrong fluid which accelerates clutch pack wear.