My Volvo Electric Power Steering Concern

Tiny
PCHAO2
  • MEMBER
  • 2015 VOLVO S60
  • 2.0L
  • 4 CYL
  • TURBO
  • FWD
  • AUTOMATIC
  • 7,000 MILES
In both directions, the steering on my 2015.5 S60 T6 (FWD OE Turbo and OE Supercharger) with OE 19 in. Wheel and OE sport suspension is not precise (loose) and overly light (too much power steering assistance) ONLY during 60+ mph on twisty freeways. This circumstance causes inaccuracy in steering, which can result in compromised safety and poor response on twisty roads or during emergency maneuvers.

I believe the problem is in the EPS (Electronic Power Steering) system. According to Polestar, my car has the new fully electronic steering, whereas in the past it is only partial. Monitor by sensor(s), the EPS system has variable assist, which allows for more assistance as the speed of the Volvo decreases and less assistance from the EPS system during high speed situations. The nature of EPS versus traditional hydraulic power steering is that it is easily adjustable/tunable. According to Clemson University Vehicular Electronics Laboratory, one can alter the steering weight to radically improve steering feel and high speed stability. Furthermore, the ECU (Electronic Control Unit) evaluates:
1) the steering torque, 2) the steering direction being applied by the driver, 3) the road speed, 4) electric motor to provide the required amount of assistance in the correct direction. A poorly functional ECU can cause poor steering response. In certain instances, a simple reprogramming of software or replacement of torque sensor(s) is needed to increase precision safe steering.

After recently driving a loaner car, a 2015.5 S60 T5 Premier with also 19 in. Wheel and sport suspension, on the same twisty freeway, the loaner has more accurate steering than my T6 Platinum no matter what steering mode my car was set. The chassis difference between my car from the loaner is an additional supercharger and my EPS system has the feature to adjust between light, medium, or heavy, whereas the loaner is fixed.

1) What are the possible causes for my particular problem?
2) Will hooking up my car to VIDA (Vehicle Information and Diagnostics for Aftersales) diagnose the problem and assist my EPS system to be electronically adjusted, such as software updating?

Thank you for your assistance,
Peter
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Wednesday, June 17th, 2015 AT 11:30 AM

1 Reply

Tiny
HMAC300
  • EXPERT
Unfortunately we have little info on steering for this car and the only way you will be able to tell is by scanning for codes to see if one is being thrown or not. I looked for tsb's and found none I looked under t5 and t6. The car is actually to new for us to have much in the manual as he manufactures haven't released the info as of yet. If this is not a sufficient answer contact me and i'll get a refund for you.
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Wednesday, June 17th, 2015 AT 12:09 PM

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