Meredith Thomas
Member
Help! Persistent slipping 1st to 2nd. Local indie workshop adjusted the gear lever cable and all well for a few weeks. Slipping came back, gearbox oil changed, new ZF 6HP28 Mechatronic Unit, new oil pan etc. Had to go to a JLR dealer for re-programming, ended up on-line to Solihull where factory took a full day to get the transmission to work. Amazingly JLR picked up all but one hour labour and the diagnostic fee. Again, all good for a several more weeks then back to more gear slipping. Back to the indie who was not able to locate the fault. Went to the JLR dealer, who reported low gearbox oil but no trace of a leak. Oil topped up and took the LR4 for a 250 mile round trip during which it ran like a Singer sewing machine. Went to move the car this afternoon, reversed fine but when I went to reverse a second time would not engage. On the dash the gear selection indicator now shows P-N-N-D, i.e two neutrals and no reverse. Connected my GAP tool, nothing happened, no light and no signal. Connected it to the IID updater, no apparent problems. Tried again in my car, but still dead. The indie workshop said they had taken a good look at the gearbox and it appeared to be in great shape, no metal filings in the oil which was still very clean. My gut tells me that the problem is in the electronics as another continuing mystery is a "low fob key battery" warning even though both batteries are new. Perhaps there is an old key fob lost in the car somewhere, but the vehicle remains locked provided the keys are not close by, so the problem is the message, to pun Marshall McLuhan. The trouble with most auto repairers these days is that they cannot identify the source of problems if their diagnostic tools do not give them the answer. So now I seem to be facing a full transmission tear-down and rebuild, which at 86,000 miles cannot be right.
Any suggestions?
Any suggestions?