Home >> Land Rover >> 2021 >> Range Rover SVAutobiography Dynamic Blk. >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Powertrain Control Module (Pcm) - 5.0L Petrol -- Range Rover/L405 (2 Of 2) >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Powertrain Control Module (Pcm) - 5.0L Petrol (G2693870) >> DTC U0284-87 Lost Communication with Active Grille Air Shutter Module "A" - Missing message >> Possible Causes