Some Buick Enclave owners may notice that their crossover’s Driver Information Center (DIC) displays the message “Service Power Steering.” Now, a possible cause behind this message has been identified, and with it, a possible solution to be implemented by a GM technician.
Per a report from GM TechLink, this particular Service Power Steering issue may be present in certain units of the Buick Enclave produced for the 2018 through 2023 model years. The DIC message may be accompanied by Diagnostic Trouble Code (DTC) P0128, which corresponds with Engine Coolant Temperature Below Thermostat Regulating Temperature. Although DTC P0128 is not directly related to the power steering system, the Service Power Steering message may still be displayed so as to protect the steering gear should there be an undetected overheating condition present.
Per the GM TechLink report, the onboard power steering module is designed to detect issues that occur in the electric power steering system and react accordingly, such as by disabling steering assist, which will trigger the Service Power Steering message. The module will also monitor internal system temperature and will reduce power steering assist levels if the internal temperature is calculated to exceed a certain level. Full power steering assist is only provided once internal system temperatures drop below the pre-determined level.
To address this issue, GM technicians are advised to first diagnose and repair any possible engine cooling issues for the Buick Enclave as related to DTC P0128. Once these possible issues have been addressed, technicians will then clear any DTCs and test drive the vehicle. If the Service Power Steering message returns, technicians should then follow the appropriate steering system diagnostic.
As a reminder, the latest 2023 Buick Enclave is equipped as standard with the naturally aspirated 3.6L V6 LFY gasoline engine, which is rated at 310 horsepower at 6,800 rpm and 266 pound-feet of torque at 2,800 rpm. Under the body, the crossover rides on the GM C1 platform, while production takes place at the GM Lansing Delta plant in Michigan.