Having on going issue around a month ago brake switch failed I fitted new one ( genuine) was fine for three weeks then had to go to dealer as a auto locksmith mucked up my bcm and locking, bcm had to be reprogrammed to get locking working but at this visit the coil light came on and brake switch implausible dealer changed under parts warranty was fine for two days then back on, if I clear fault and leave van running it's fine as soon as brake pressed hill assist error appears and fault is logged in abs module if cleared and driving first hill start the coil light comes on, brake lights work fine , today I removed passenger seat disconnected harness and made dummy harness with bulbs and fault occurs first press of pedal so I know it's nothing to do with cab back, going to have to continue the hunt through the wiring, beginning to think it maybe internal fault in abs module