I have a 2017 6 CY. F Type Coupe 21,000 Mi. The low battery warning message was on yesterday and a totally flat battery today. The emission testing folk plugged their Gizmo in at the testing station. Could that have triggered anything? Also, others have written on similar charging problems and use a battery tender in the trunk. Since the cigar lighter is hot when the engine is off, wouldn't that be the better way to hook up a battery tender? Thoughts and comments appreciated.
F Type Battery Issues
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Yep, plugging a device into the OBDII port is a well known cause of a flat battery in the F-Type.
Not all OBDII plug-ins but many, and in the US almost all emissions testing plug-ins cause the problem, it varies from state to state.
What happens is the OBDII plug-in is disconnected / pulled out but it hasn't yet fully shut the session so one or more of the car's electrical modules stay "live" and continue to draw amps, enough so that left overnight like this the battery is flattened.
Step 1.
Reset the Battery Management System (BMS) by disconnecting (unbolting) the earth/ground lead from where it bolts to the floor of the trunk for around 30 seconds then re-connect.
Step 2.
Connect a battery tender/maintainer and leave it going overnight, that should recharge the battery fully. If the battery doesn't recharge fully overnight then it may be beyond salvaging and you would need a new battery.
No point trying to use one of the interior 12v "cigarette lighter" plugs for overnight charging as they all turn off after about 20 minutes.
Heaps of threads, posts and info about this battery problem on the US forum: F-Type ( X152 ) - Jaguar Forums - Jaguar Enthusiasts Forum
Many thanks for the speedy and detailed info. I'll try it overnight. I had just got the car so was pretty glum when it wouldn't fire up.
I'll post findings
Cheers
Peter
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I think the cigarette lighter socket goes off after maybe 10 mins from locking. Not good for charging.
OK Disconnected neg at frame for 30 seconds then reconnected. Quite a spark on reconnecting indicating that some circuit was still open. Maybe that is normal. (I had been out for a 30 minute run prior to disconnecting so there was a fair charge in the battery) The alternator is charging at around 13.7 to 14.4V and standing voltage is 12.7 I'll leave the car in the garage for a couple of days and see if the low battery light comes back on or worse, if nothing comes back on, or best outcome, glitch fixed. A lot of info on the forum some slightly conflicting but no doubt totally accurate for the poster's issue. I'll update later in the week.
P
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2 Posts
Same thing just happened on my car. Smog test AZ. Took 2 days to get enough juice to open the boot and get at the battery. Removed as that is what is recommended. Interstate dealer did not have one and didn't want to deal with it. My charger was seeing under 7 volts so it was only pushing 6 to the charger-why 2 days. Said hit it with 5 amps for 5 hrs then 3amp till charged. My charger started pushing 12V at it once it came up enough. I had it loaded tested and was fine. Re-installed all good.
Thanks for confirmation of remedial action. No trouble since I did the ground disconnect and fully charged the battery. Not sure if it in fact cured the issue or if I am benefiting from the full charge. I am out town for a week so should know for sure next week end. I will post an update on my return.
Cheers
Peter W.
Cheers
Peter W.
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2 Posts
Did you fully charge off the front jumper points? Your charge 12V only? Mine is a fancy high tech automatic that detects the volts and adjusts accordingly. I went to Wal-Mart and got a cheap $50 12V and of course it did not work out of the box. Returned it and got one at auto parts store $110. Got home and my charger was pushing 12V so another return. 5year old car with 15K and only 3K in the last 2 years I was expecting a dead battery.
OK so after a week in Florida, and with some trepidation, I opened the car door, the Jaguar nameplate lit up, so far so good, the car started right up. Disconnecting the ground at the frame near the battery completely sorted out the draining issue caused by the testing station gizmo. I had to reset everything including the auto roll up for the windows but that was a small price to pay for a total cure. Prior to that, the car would discharge overnight. Thank you for the reset tip.
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Thank you for this thread.
I recently bought a used MY16 F-type V6S (which had a fresh battery), in my first few days driving it I started getting the low battery sign.
I recalled the previous owner had said he had just smogged the car and it all made sense.
Unhooked the terminal and now the red hazard light turns off, hopefully this has fixed the problem, I'll find out in the morning.
I recently bought a used MY16 F-type V6S (which had a fresh battery), in my first few days driving it I started getting the low battery sign.
I recalled the previous owner had said he had just smogged the car and it all made sense.
Unhooked the terminal and now the red hazard light turns off, hopefully this has fixed the problem, I'll find out in the morning.
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