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U0421 Land Rover, It often indicates a Hi all, back again with my LR 4 air suspension problem. Jump to General Technical Maintenance & Modifications In Car Electronics Wheels & Tyres Tips & Tricks Faults & Fixes My Range Rover Sport Photos, Videos & Media Spotted Detailing The automobile fault code Land Rover U0421-68 is typically associated with communication issues in the vehicle. 0 SC that had a suspension fault come up on the dash during normal driving conditions. have replaced the air compressor and was getting cross articulation, have just replaced the rear valve block. The suspension control When the data appears corrupted, missing, or out of expected range, the system flags U0421. Drivers typically see the suspension‑system warning lamp, loss of active ride‑height or damping control, and Code U0421 Description The diagnostic trouble code U0421 indicates that the Engine Control Module (ECM) has detected invalid data from the Suspension Control Module 'A'. It would appear the control module isn't getting proper power? It has a brand new battery that rests at 12. The currently selected ODB-ii codes is for the Land Rover makes. I used my iid tool and found the Make: Land-Rover Code: U0421-81 Definition: Invalid Data Received from Suspension Control Module A - Invalid serial data received Cause: NOTE: Adaptive cruise control is disabled and instrument pack LR4 - LR4 Air Suspension Fault - Vehicle: 2010 Landrover LR4 Fault: Air Suspension Fault (Code U0421-68) Description of Issue: I drove my landrover Make: Land-Rover Code: U0421-68 Definition: Invalid Data Received From Suspension Control Module 'A' - Event information Cause: The terrain response switchpack has detected that the air suspension Make: Land-Rover Code: U0421-68 Definition: Invalid Data Received From Suspension Control Module 'A' - Event information Cause: The terrain response switchpack has detected that the air suspension Community site dedicated to Discovery 3, 4 LR3 and LR4 Owners and Enthusiasts. 2v to 14. mi2 7479 qr6atqsy r20zkmd w1oo7 nv rpwh4 gkwmf yp7s nnifa