Forrest Gump 9

What can cause the red screen with the battery sign and visit workshop display?

I thought it was the battery, switched both the front and rear out with brand new batteries but the red display is still there.

berti_00

your Voltage regulator is bad... its a 60 dollar part and is right on the alternator

Jimshorts

Wasn't the voltage regulator for me... had to replace the whole alternator.

Forrest Gump 9

Thank you for the quick reply. I was afraid the alternator, but I can live with the voltage regulator.

Forrest Gump 9

The weird thing is that it's been like this for the last three months or so. The car has been fine other wise. Oh well, I'll try the voltage regulator first and see what happen.

baldmike73

mine was the secondary battery -

Roverron

hey Forrest i have one for cheap like $50 Bosch original it was in the classified section.

0-60inAMG

it was the secondary battery on mine as well, just picked up the exact fit replacement battery at Walmart for about $85, the stealer wanted over $300

cahiil55k

Just 2 weeks ago I had to replace my secondary battery because of the same red warning described in this thread. It was an $80 battery at Pep Boys. Make sure you properly prep and charge the battery before installing it. I had to trickle charge mine for 8 hours before putting it in.

bghark

+1, had to put in new alt. Not a bad job but do it from underneath. At least it was for me. A one hour job.

AWOL

It wasnt the voltage regulator for me either.

I still get this message but have yet to swap out the alt

blackbenzz

Also check your ground strap but yea most likely alternator

berti_00

our alternators i hear are super solid and almost never fail but than again you never know

AWOL

This would make the second time mine has failed, fwiw

backdoc7

I got into the car today and no A/C.. then got the "Battery Protection" conven. features turned off warning... was told by the indy over the phone it's most likely the aux battery so I replaced it. That wasn't it and I got the red "BRAKE" screen and my brakes actually pretty much went out about a mile from home on my drive home.. as I was pulling over on the freeway the red light went off and I had brakes again so I got her home. I also got the "low voltage" screen on the command screen. Might just change out the rear battery and go from there but from those symptoms, especially the "low voltage" on the command does that mean voltage reg or alt? Thanks.

Roverron

can you get a volt meter and see if its charging at idle. should be over 12vdc. I know I thought i had an issue with my alt and volt reg, but it was only that i don't drive the car long enough to charged the battery after working on it. my drive to work is less than 10 mins so it would not get a full charge. i bought a charger and charged both batteries up and not problem since then. if you need a voltage reg i can sell you mine its a BNIB Bosch. $60 with shipping.

backdoc7

Thanks.. i might need that volt reg.. I trickle charged the rear battery over night and started the car this morning.. all warnings were gone. That might mean the alt isn't charging the battery or maybe it just took a slight charge overnight, enough to make the warnings go away.. I will test with a volt meter and go from there. Thanks!

backdoc7

OK, so I used my torque program to check voltage both with the car in idle and at 2,000 plus rpm's and it's always 11.8-12.1 volts. I guess I'm not charging hence the "battery protection" mode. So before I replace the rear battery, I guess I have to figure out if it's the volt meter or alternator. Any way to check this at home? Might just start with a volt meter and go from there since the rear battery seemed like it took a charge with the over night trickle charger.. any advise is appreciated. Thx!