CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

2003 CLK 500 code P0778

Old 04-27-2019, 02:55 PM
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2003:CLK 500
2003 CLK 500 code P0778

2003 clk 500 keeps getting code P0778 "pressure control solenoid B electrical" I've changed the conductor plate twice, changed the solenoid, changed the valve body, even changed the wiring harness. What else could cause that code?
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Old 04-27-2019, 09:00 PM
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CURRENT: 2011 SL550, 2010 ML350, FORMER: 2007 CLK550 Cabriolet, 2002 C240, 2001 ML320, 1984 300TD
It may be a bad solenoid int he valve body. It might also just have trash in it. I'd remove the solenoids and thoroughly clean them. Also, remove the horizontal plates on the side of the valve body and inspect the return spring under there to make sure none are broken.
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