Saab 9-5 service AWD and rear axle warning lights issue, possible communication error on Saab 9-5

Some Saab 9-5 owners report experiencing warning lights related to the service all-wheel drive (AWD) system and rear axle, which may indicate sensor issues or communication errors between vehicle systems. These warning lights can be intermittent and may appear after specific events, such as alignment. While some users have found that resetting the warning light provides a temporary fix, the underlying issue within the AWD system or rear axle often requires attention to prevent recurrence. Owners are advised to seek professional inspection from a trained mechanic or Saab dealership if the warning lights persist. Additionally, checking the rear differential fluid level is crucial, as an overfilled condition can trigger these warnings. Some users have also reported success with service centers reprogramming axle control modules, although this may not resolve the root cause. Regular maintenance, including fluid checks and changes, is recommended to help prevent issues with the rear axle and AWD system.