YOUR RESEARCHP1656 Tiptronic error - changed valve but still error persist ?
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1 matching discussions · 3 captured posts examined · 0 partial discussions
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Hi! Tiptronic gives that P1656 error which translates into " Coolant switch-over valve". I changed that valve #14 but the error still persists - this relates to heat so this so called "ATF cooler electric shutoff valve" should activate when either the water temp or ATF oil temp goes above certain temperatures. Now the question is - where does that #19 connects to? Where exactly physically is this "ATF cooler electric shutoff valve"?
The hose #19 connects to a change-over valve (electro-vacuum solenoid) part # 996 605 123 91 ,that is located on top center of the engine near the starter motor. Remove the throttle body and both intake center plenums to get to it. The change-over valve is either bad, disconnected , or has damaged wiring to cause that code.
Thanks - Looks like there's an updated version of that part - new version has part # 7PP906270
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