The symptoms vary depending on which Land Rover model you have (L322 Range Rover, L405, L494 Sport, L359 Freelander 2/LR2, L538 Evoque, or L550 Discovery Sport).
A "U" code immediately signals that the problem is not necessarily a mechanical failure (like a broken piston) but an issue with the digital language your car’s computers use to speak to one another. land rover u0151-31
= Lost Communication with Restraints Control Module (RCM) – Invalid/Incomplete Signal The symptoms vary depending on which Land Rover