Home >> Jaguar >> 2021 >> XF S >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> General Information - Diagnostic Trouble Code (DTC) Index (INGENIUM 2.0L Petrol - U2300-64 TDV6 3.0L Diesel Pcm P06FC-88) -- XF/(X260) >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - INGENIUM I4 2.0L Petrol, DTC: Powertrain Control Module P0611-02 To U2300-64 (G2116765) >> DTC U2108-86: Adaptive Cruise Control - Signal invalid >> Possible Causes