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996 Turbo ABS and PSM warning - battery?

mat59

By mat59
in 996 TT, 996 TT S, 996 GT2

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mat59 Member

mat59

Posted
Posted

Hi guys,

 

My 2001 996 Turbo (ROW) has not been used a great deal over the hot summer we have here in Dubai. Went to start it the other day and the ignition turnover sounded a little weak. Went for a 30 min drive and parked up. Ten mins later I went to restart the car and got the two warnings - ABS and PSM. Suspected the battery straight away so checked it with a multimeter. It's reading 12.1 at rest which is very low. So, I need a new battery.

 

Just to be sure I took the battery out of the 996 and thought I'd start the car with the brand new battery I'd just bought for my Subaru BRZ, which is a lower spec battery.  Car started fine but the ABS and PSM warnings remain. I didn't drive the car, just started it on the driveway.

 

Will these warnings need to be reset or should they go away after a while with a new 996 turbo spec battery? I realise it could just be a coincidence and I have another issue relating to the warning in addition to my weak battery.

 

Any thoughts welcome!

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JFP in PA Member

JFP in PA

Posted
  • Moderators
Posted

Check both the voltage output of your alternator, and if you have the equipment to do so, load test the alternator as well.

 

ABS/PSM faults are common when the available voltage drops too low.

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JFP in PA Member

JFP in PA

Posted
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Posted
29 minutes ago, mat59 said:

Thanks, but my alternator was replaced less than 3k miles ago. Sorry, should've said!

 

Doesn't matter if it was changed 3 miles ago, it still needs to be tested.  A lot of problems like this are traced to the alternator rather than the battery.

mat59 Member

mat59

Posted
  • Author
Posted
9 hours ago, JFP in PA said:

 

Doesn't matter if it was changed 3 miles ago, it still needs to be tested.  A lot of problems like this are traced to the alternator rather than the battery.

OK, thanks. Will check.

  • 3 weeks later...
mat59 Member

mat59

Posted
  • Author
Posted

OP here. Turns out it was the battery. Fitted a replacement Bosch 80 ah and after a few drives the warnings disappeared. Thanks for everyone's help!

 

Matt

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