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1991 928 S4 GT
Join Date: Jun 2010
Location: Massachusetts
Posts: 4
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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 |
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06-29-2010, 06:48 AM
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Petie3rd
Join Date: Jul 2000
Location: Aurora Co.
Posts: 3,562
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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 ^^^ 1988 S4 Auto , Color is Elfenbein Perlglanz, with a Pearl Gray leather interior, MOTORSPORT of UTAH X pipe 2005 Range Rover MK III, Giverny Green/ Oxford leather Lux interior, BMW 4.4i |
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06-29-2010, 09:40 PM
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