Mercury Mountaineer wrench light indicator turned on on Mercury Mountaineer

Some Mercury Mountaineer owners report experiencing issues related to the wrench light indicator, which typically signifies a transmission fault. This light differs from the check engine light, serving as a failsafe warning for potential problems with the "fly by wire" throttle system. Owners may find that when the powertrain control module (PCM) detects a powertrain issue, it triggers the wrench warning indicator on the instrument cluster. While occasional illumination of the light may not warrant immediate concern, frequent activation or a constant display of the wrench light suggests a need for a mechanic's inspection to diagnose the underlying issue.