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Check Engine light came on, no power at OBD II connector S80

posted by  anderssj on  Sat Feb 9 09:25 CST 2019
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last visit: Thu Oct 23 17:03 CST 2014
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Thanks for all of the inputs and suggestions. reseating connectors on the CEM got power and cleared the bogus DTCs (communication with L/R door modules, etc., etc.). The remaining DTC, ECM 120D, was traced positive crankcase pressure caused by a clogged crankcase vent system. Replaced the oil trap and related hoses and it's now all good.

BTW, when I picked up the parts at the dealer I mentioned that I was a little surprised to see this problem at 164K miles since I change the oil and filter more often than the Volvo-recommended interval...mechanic said that they sometimes see this problem at < 70K, even when following the recommended interval (oil and filter change at 7.5K). Now hoping to get at least another 100K ;)

Thanks again!

Steve A-






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