Krill
Full Access Member
Good morning, having a weird issue with my 2014 L405 autobiography 5.0SC
back story
Alternator shear pulley failed about a month ago leaving me to swap oil alternators in a autozone parking lot. Swapped with now further issues, have driven about 2500 miles since.
Finally had time to fix all the other things that have been on the to do list with a new to me 200k mile Range Rover.
Metal crossover pipes
Crankshaft seal and cover
Water pump
All pulleys
Valve cover gaskets
New injectors, plugs and coils( sold a kidney for them )
Cleaned valves
Motor mounts and a few coolant hoses that concerned me.
Get everything back together, car fired right up and runs fantastic! But immediately popped up with a charging system fault. Voltage changes every time I take a look at it. Some times it’ll be 12.3 other times it’ll be 14.5 the only thing that is consistent is if I turn max a/c on after a few minutes the charging fault clears itself and the car normally stays at whatever voltage it was at( 12.6-13.3 ) I know 12.6 is low but what relation would ac have to do with clearing a charging fault? Double checked connections, 4 ground straps that were removed during my work, everything is where it is supposed to be. I got a gearbox fault once but cleared and never came back. Drove the car around for 30 minutes this morning, charging fault on the whole time but voltage at 13.3 going to swap a new alternator in it at noon just to rule it out but any other ideas? I read someone solved the problem with an ecm update. No idea how to do that but I do have the gap tool and am a quick study.
Fault code is P0A1A-87 (AF) Generator control module - Bus signal/message failure - missing a message
back story
Alternator shear pulley failed about a month ago leaving me to swap oil alternators in a autozone parking lot. Swapped with now further issues, have driven about 2500 miles since.
Finally had time to fix all the other things that have been on the to do list with a new to me 200k mile Range Rover.
Metal crossover pipes
Crankshaft seal and cover
Water pump
All pulleys
Valve cover gaskets
New injectors, plugs and coils( sold a kidney for them )
Cleaned valves
Motor mounts and a few coolant hoses that concerned me.
Get everything back together, car fired right up and runs fantastic! But immediately popped up with a charging system fault. Voltage changes every time I take a look at it. Some times it’ll be 12.3 other times it’ll be 14.5 the only thing that is consistent is if I turn max a/c on after a few minutes the charging fault clears itself and the car normally stays at whatever voltage it was at( 12.6-13.3 ) I know 12.6 is low but what relation would ac have to do with clearing a charging fault? Double checked connections, 4 ground straps that were removed during my work, everything is where it is supposed to be. I got a gearbox fault once but cleared and never came back. Drove the car around for 30 minutes this morning, charging fault on the whole time but voltage at 13.3 going to swap a new alternator in it at noon just to rule it out but any other ideas? I read someone solved the problem with an ecm update. No idea how to do that but I do have the gap tool and am a quick study.
Fault code is P0A1A-87 (AF) Generator control module - Bus signal/message failure - missing a message
