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· PT person-FT ****up!
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73 Posts
Discussion Starter · #1 ·
My Friends!!!!!

Courtesy of the help of my indie shop, Long Beach BMW and BMW America technicians, some trial and error and lots of patience I have my battery charging issues resolved on my GT.

Turns out you get codes thrown and stored in the computer for overcharging and ignition faults prior to the battery being fully discharged. So the group went through the process of eliminating the faults and issues to resolve the battery charging issue.

First, my new battery died and like most other owners I just went and replaced the battery, had it registered and my settings saved. No problem, I drive away from the shop feeling $450 lighter and think this should work for a few years (I know, I had other BMW's but this one is like Sybil), by was I wrong. 2 days later the wife is calling me saying she's getting battery charging messages. I say impossible, call me when you get home - she does after the car goes limp, twice! No worries, second time I say call AAA and have it towed to the dealership. I explain to them we just got the battery replaced and registered and 2 days later it's dead, what gives? They want to install another battery and charge me another $500 or so bucks. I politely tell them to call the indie shop, who by the way, they worked with for the past 12 years or so and verify the work that was just performed. They do and after confirming his work they realize the different codes the computer has stored and begin to plan to repair them all for around $3500. I told them to kick rocks and try again!! My indie steps up and between him and the dealer they begin to eliminate each problem to find the culprit. First, replace the battery, CHECK. Next, swap the ignition coils with new ones and eliminate the codes and hope to resolve the issue, NOPE. Third, Test the alternator before replacing it since it does play a role in recharging the battery, NOT THAT EITHER! During the troubleshooting testing the mechanic and Tech from BMW America noticed the CAN BUS used for the charging system has another player, the Oil Pressure Sending Unit. The OPSU was placed on the wiring system and gets often overlooked. There was a random code that caused the BMW tech to investigate and discover this. This couldn't be the culprit causing the charging system to go haywire, WRONG!!!!!! Replaced the unit with an oil change and voila!!! No more codes!!! Battery Charging System is working perfectly!

No trickle charger needed. No random spikes in charging while driving and a more stable environment for charging the phone and other devices.

I have happiness and the car is driving and charging the battery as expected.

I am not sure if my solution will work for everyone out there but if others can get the issue resolved after reading this post and suggesting to their shops to look at these steps then it was well worth the time and effort from my guys and for me to pass this info on to others.
 

· Ridin' the wingless plane
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573 Posts
I may not need it myself, but one day I may. Thank you so much for putting this out there for the next person.
 

· Registered
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9 Posts
serjio555

thanks i will replaced this on my car see what happends .
My Friends!!!!!

Courtesy of the help of my indie shop, Long Beach BMW and BMW America technicians, some trial and error and lots of patience I have my battery charging issues resolved on my GT.

Turns out you get codes thrown and stored in the computer for overcharging and ignition faults prior to the battery being fully discharged. So the group went through the process of eliminating the faults and issues to resolve the battery charging issue.

First, my new battery died and like most other owners I just went and replaced the battery, had it registered and my settings saved. No problem, I drive away from the shop feeling $450 lighter and think this should work for a few years (I know, I had other BMW's but this one is like Sybil), by was I wrong. 2 days later the wife is calling me saying she's getting battery charging messages. I say impossible, call me when you get home - she does after the car goes limp, twice! No worries, second time I say call AAA and have it towed to the dealership. I explain to them we just got the battery replaced and registered and 2 days later it's dead, what gives? They want to install another battery and charge me another $500 or so bucks. I politely tell them to call the indie shop, who by the way, they worked with for the past 12 years or so and verify the work that was just performed. They do and after confirming his work they realize the different codes the computer has stored and begin to plan to repair them all for around $3500. I told them to kick rocks and try again!! My indie steps up and between him and the dealer they begin to eliminate each problem to find the culprit. First, replace the battery, CHECK. Next, swap the ignition coils with new ones and eliminate the codes and hope to resolve the issue, NOPE. Third, Test the alternator before replacing it since it does play a role in recharging the battery, NOT THAT EITHER! During the troubleshooting testing the mechanic and Tech from BMW America noticed the CAN BUS used for the charging system has another player, the Oil Pressure Sending Unit. The OPSU was placed on the wiring system and gets often overlooked. There was a random code that caused the BMW tech to investigate and discover this. This couldn't be the culprit causing the charging system to go haywire, WRONG!!!!!! Replaced the unit with an oil change and voila!!! No more codes!!! Battery Charging System is working perfectly!

No trickle charger needed. No random spikes in charging while driving and a more stable environment for charging the phone and other devices.

I have happiness and the car is driving and charging the battery as expected.

I am not sure if my solution will work for everyone out there but if others can get the issue resolved after reading this post and suggesting to their shops to look at these steps then it was well worth the time and effort from my guys and for me to pass this info on to others.
 

· Registered
Joined
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3,101 Posts
Wonky CANBUS modules can be a major pain. When the car shuts down, it sends a message to all attached modules that they should go into low-power mode (just like many things today, there is no real off state). If a module gets a corrupted message for some reason, it may not shut down and the car and battery aren't designed to handle modules that are in operate mode for very long when everything else is in sleep mode (i.e., the car is not 'running'). Failure to get that message could be a wiring issue (loose or corroded connection), or someone rerouted or added something, and electrical interference creates issues (it is twisted pair, so that helps a lot). All sorts of weird issues can occur when there's something on one of the CANBUS channels that is not communicating properly.
 

· Registered
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9 Posts
charging issues

i have replaced the battery on my fo7 2010 because i was having issues with the hud it was working intermittently some times so low you could not see it at all, was tall that battery was low on voltage to replace it, i have done that now im having similar issues again i have notice that after the battery change that when i take my foot of accelerator and look at the gouge that goes from the red to blue as to charge battery it hesitates a bit its not spontaneous should it be?:dunno::
 
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