OBD battery discharge question

Reply Subscribe

Thread Tools

Search this Thread

09-20-2018, 12:55 PM

ssaeed1973

Member

Thread Starter

Join Date: Aug 2018

Location: California

Posts: 32

Likes: 0

Received 2 Likes on 2 Posts

OBD battery discharge question

i Understand there is a battery discharge issue if anything is connected to the OBD port and it requires a disconnect of the battery to fix. How do you diagnose if the issue exists and if the battery disconnect and connect has solved it?

Reply Like

09-20-2018, 02:14 PM

Itismejoshy

Senior Member

Join Date: Jun 2017

Posts: 383

Likes: 150

Received 146 Likes on 75 Posts

the park button (P) on the stick stays lit for longer then 30 mins after you turn off the ignition is my first clue...

Reply Like

09-20-2018, 02:45 PM

DJS

Veteran Member

Join Date: May 2013

Location: Metrowest Boston

Posts: 6,218

Likes: 1,269

Received 2,073 Likes on 1,377 Posts

I think the hazard switch on the dash stays lit too, though I haven't had this issue.

Reply Like

09-20-2018, 02:48 PM

Unhingd

Veteran Member

Join Date: Dec 2014

Location: Maryland, US

Posts: 16,937

Likes: 1,306

Received 4,640 Likes on 3,362 Posts

Quote:

Originally Posted by Itismejoshy

the park button (P) on the stick stays lit for longer then 30 mins after you turn off the ignition is my first clue...

+1. Also, if you get a “battery low warning” the day or 2 after the car was last driven, it indicates the reboot is needed.

Reply Like

09-20-2018, 03:22 PM

ssaeed1973

Member

Thread Starter

Join Date: Aug 2018

Location: California

Posts: 32

Likes: 0

Received 2 Likes on 2 Posts

Quote:

Originally Posted by Unhingd

+1. Also, if you get a “battery low warning” the day or 2 after the car was last driven, it indicates the reboot is needed.

park indicator on gear stick turns off and the hazard light after two or three minutes. Looks like it did the trick

Reply Like

09-20-2018, 04:05 PM

Itismejoshy

Senior Member

Join Date: Jun 2017

Posts: 383

Likes: 150

Received 146 Likes on 75 Posts

Quote:

Originally Posted by DJS

I think the hazard switch on the dash stays lit too, though I haven't had this issue.

Yup, it does also

Reply Like

09-21-2018, 02:20 AM

Brava

Member

Join Date: Sep 2017

Posts: 68

Likes: 2

Received 9 Likes on 8 Posts

I have connected the VAP tuning device to the obd several times by now, no issue with the battery discharge or anything else.

Reply Like

Trending Topics

Transmission knocking/shifting slow

13

420
Headliner let go (alacantara)

12

556
Quick Question on Jacking/Trans Service

12

231
Valve Cover Gasket Replacement

12

362
Buy Decal Plug Sockets

11

353

09-21-2018, 07:28 AM

Itismejoshy

Senior Member

Join Date: Jun 2017

Posts: 383

Likes: 150

Received 146 Likes on 75 Posts

Quote:

Originally Posted by Brava

I have connected the VAP tuning device to the obd several times by now, no issue with the battery discharge or anything else.

I believe general consensus (unhidged, ftype17, etc) from a previous thread is that if the device "disconnects" from the obdII connection in the proper fashion and not just unpluged while the link is still open it will not stay on, but that isn't always possible with some of the basic code scanners so who knows 100%.

Reply Like

09-21-2018, 12:55 PM

lizzardo

Veteran Member

Join Date: May 2015

Location: Northern California

Posts: 3,370

Likes: 24

Received 954 Likes on 715 Posts

Quote:

Originally Posted by Itismejoshy

This does appear to be the case. I've had zero issues, even when I just used the VAP tool to scan for codes. I have a ScanGauge and a good quality Bluetooth OBDC device that both give the battery problem though. This is a software defect, although I don't see JLR stepping up to fix it. They haven't yet and it's been a known issue for several years now.

Reply Like