Home >> Land Rover >> 2021 >> Defender 90 X >> Repair and Diagnosis (Single Page) >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index Vehicles With: PHEV, DTC: Battery Energy Control Module (BECM) -- Defender/L663 >> Diagnostic Trouble Code Index - Vehicles With: PHEV, DTC: Battery Energy Control Module (BECM) (G2760131) >> Description And Operation >> Battery Energy Control Module (BECM) - Plug-In Hybrid Electric Vehicle (PHEV) >> DTC P0AA3-66: Hybrid/EV Battery Negative Contactor Circuit - Signal has too many transitions/events >> Possible Causes