Some GMC Acadia owners may notice that their vehicle’s Driver Information Center displays a “Service Power Steering” message. Now, a possible cause behind this issue has been identified, as has a solution to be implemented by GM technicians.
According to a recent report from GM TechLink, this issue may affect 2017 through 2023 GMC Acadia models. In addition to a Service Power Steering message displayed in the Driver Information Center, the GMC Acadia may also throw Diagnostic Trouble Code (DTC) P0128, or Engine Coolant Temperature Below Thermostat Regulating Temperature. Although this particular DTC is not in direct reference to the power steering system, the Service Power Steering message will be displayed to protect the steering gear in the event of an undetected overheating condition if the Engine Control Module reads a coolant temperature issue.
As outlined in the GM TechLink report, the GMC Acadia’s power steering module can detect issues in the electric power steering system. Issues may result in the system disabling steering assist, which in turn will display the Service Power Steering message. The power steering module also monitors internal system temperature, and if the calculated internal temperature exceeds a certain level, the power steering assist level is reduced. Full power steering assist will return when internal system temperatures drop below the pre-determined level.
In order to address the Service Power Steering condition, GM technicians are instructed to diagnose and repair possible engine cooling issues as related to the DTC P0128. Once repairs to the engine cooling system are performed, technicians are instructed to clear the system codes and test drive the vehicle. If the Service Power Steering message returns after addressing any possible cooling issues, technicians are instructed to follow the appropriate steering system diagnostic to remedy the condition.
The latest 2023 GMC Acadia is the seventh model year for the latest second-generation crossover, following up on a mid-cycle update introduced for the 2020 model year. Two engines are offered, including the turbocharged 2.0L I4 LSY and naturally aspirated 3.6L V6 LGX. Under the body is the GM C1 platform, while production takes place at the GM Spring Hill plant in Tennessee.