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Home › Land Rover › 2015 › Range Rover Base › Repair and Diagnosis › General Information › 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

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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