B7F8F9

What the code means

Fault code B7F8F9 with the description “HU-H: Reset” is stored in the HU-H3 head unit. It points to a sporadic reboot of the HU-H3 head unit, accompanied by a brief shutdown of the Central Information Display (CID). After the reboot, CID and HU-H3 functions come back within a short time.

The code falls into the electrical category and has moderate severity. The fault can show up several times per trip, especially on long drives, but it doesn't cause a permanent loss of infotainment function.

Symptoms

• The Central Information Display (CID) screen goes black.
• The HU-H3 head unit reboots sporadically.
• CID and HU-H3 functions are available again after a short time.
• The fault can occur several times on long-distance drives.
• Fault code B7F8F9 – “HU-H: Reset” is stored in the HU-H3.

Diagnosis and repair

• Take the car to a dealer to have the fault fixed.
• A repair using body filler and paint won't restore a factory finish.
• The damage can be hidden behind the license plate.
• A repair to factory specs beats a half-hearted job.