TSIB 26-02
Service Bulletin/Repair Instructions
Bulletin describing the proper de-aeration for Allison EGEN Flex Hybrid coolant loops.
Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
TSIB 26-02
Bulletin describing the proper de-aeration for Allison EGEN Flex Hybrid coolant loops.
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.