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Home >> Land Rover >> 2017 >> Range Rover SVAutobiography >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) -- Range Rover/L405 >> Diagnostic Trouble Code Index DTC: Automatic Temperature Control Module (ATCM) >> Description And Operation >> DTC B12B9-87: Auxiliary Heater Control Module - Missing message >> Possible Causes
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Possible Causes

NOTE:
  • This DTC will log with the ignition set to on for a minimum of 11 seconds or with the engine running. When it is repaired, it will self-delete with age, or instantly using the manufacturer approved diagnostic system
  • Circuit reference - LIN 4 -
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