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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
Old 06-29-2010, 06:48 AM
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Mrmerlin's Avatar
Join Date: Jul 2000
Location: Philly PA
Posts: 4,174
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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
^^^ Stan ^^^
1988 S4 Auto , Color is Elfenbein Perlglanz, Pearl Gray
1985 Porsche 928 Euro 5 speed , Black on Black 16V
2011 BMW K1300S Magma red
Old 06-29-2010, 09:40 PM
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Old 06-29-2010, 09:40 PM

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