Voyager 1 has a real attitude problem.
Voyager 1 continues to return science data and otherwise operate as normal, but readouts beamed back to Earth from the probe’s attitude articulation and control system (AACS) don’t reflect what’s happening onboard. As NASA’s Jet Propulsion Laboratory explains, the AACS, which keeps Voyager 1’s antenna pointed at Earth, appears to be in working order. The telemetry data it’s returning, though, is invalid—appearing randomly generated or not reflective of the system’s possible state. No onboard fault protection systems have been triggered and the spacecraft has not yet entered “safe mode”, nor has Voyager 1’s signal weakened.
