Some Chevy Blazer and Chevy Traverse owners may notice that their crossover displays a message that reads “Service Power Steering” in the vehicle Driver Information Center (DIC). Now, a potential cause for this issue has been identified, and with it, a solution that can be implemented by a GM technician.
According to a recent report from GM TechLink, the Service Power Steering message issue may be encountered in certain units of the 2019 through 2023 Chevy Blazer and 2018 through 2023 Chevy Traverse. The message may be accompanied by Diagnostic Trouble Code (DTC) P0128, or Engine Coolant Temperature Below Thermostat Regulating Temperature. Although this DTC is not directly related to the power steering system, it’s possible that the Service Power Steering message is displayed so as to protect the steering system in the event of an undetected overheating condition.
As described in the GM TechLink report, the power steering module for the Chevy Blazer and Chevy Traverse is designed to detect possible issues with the electric power steering system and respond as needed. This could include disabling the steering assist, which can trigger the Service Power Steering message in the DIC. The onboard module will monitor the internal system temperature and reduce power steering assist if the temperature exceeds a certain level, only returning full steering assist once internal system temperatures drop below the pre-determined level.
In order to fix this issue on affected units of the Chevy Blazer and Chevy Traverse, a GM technician will first diagnose and repair possible engine cooling problems as related to DTC P0128. Once these problems have been addressed, technicians are instructed to clear DTCs and test drive the vehicle. In the event that the Service Power Steering message returns after these actions, technicians will then follow the appropriate steering system diagnostic.