NOTE: The fault indicates that the high idle regeneration (HIR) was aborted due to the coolant temperature not reaching the minimum 60°C (140°F) to initiate a high idle regeneration. The amber warning lamp (AWL) comes on for approximately 15 seconds during the regeneration then goes out and the regeneration aborts. If engine fails to reach 60°C (140°F).

NOTE: Engine can not regen because coolant does not get up to at least 140 degrees. You need to find the reason coolant won’t get up to temperature.