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1991 928 S4 GT
 
Join Date: Jun 2010
Location: Massachusetts
Posts: 4
Porsche Crest 91 928 dash msg, "Differential control inop"

I hope someone may have seen this problem before.....
after starting my display shows "Differential Control off" and then Brake service required.
the dealer says both are fine and operational....
I have noticed that when I run the AC I get low voltage and I am wondering if this is result of low voltage to the control module.
I only have 23,000 miles and the car runs great otherwise.
Thanks for any help
Daryl
Old 06-29-2010, 06:48 AM
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Petie3rd
 
Mrmerlin's Avatar
 
Join Date: Jul 2000
Location: Philly PA
Posts: 4,336
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when was the last time you flushed out the PSD unit?? what is the charge rate at the hot post with the engine running?? use a volt meter to find out
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^^^ Stan ^^^ 2011 BMW K1300S Magma red
1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray
1985 928S Euro auto , Blue/ Blue 16V
1982 928S Weissach auto, rat rod with a sorted out chassis
1986.5 928S Meteor Metallic auto Brown Tan
Old 06-29-2010, 09:40 PM
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