Two DTC's P0412 and P0740 - Volvo Forums - Volvo Enthusiasts Forum

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Old 01-19-2011, 04:42 AM
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Join Date: Jun 2010
Posts: 54
Default Two DTC's P0412 and P0740

Alright so I went to one of those expensive shops and had the car scanned, it came up that the AIR pump and valve were bad (along with the ABS problems) so I decided a used air pump would solve the problem. Got one off of ebay that seemed in good order for my S90 and just installed it. Now instead of the 0412 only, I am getting a 0740 code something like TCC circuit fault. Any ideas what these two together mean???
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Old 01-20-2011, 10:30 AM
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Location: Albuquerque, NM
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Sorry no clue. I was getting a P0420 or P0430 for about 2 months and cleared it one day and it has never come back.
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Old 01-20-2011, 03:22 PM
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Join Date: Jun 2010
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I took mine to a shop and they said that the AIR pump and check valve were not operating (causing the 0420) so I replaced the pump and check valve with used ones (b/c they are exorbitant anywhere else) and now I have the same issue +1.

Does anyone have proper wiring diagrams for a 97 S90? I could troubleshoot this damn thing if I just knew what I was looking for.
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Old 07-12-2017, 10:48 AM
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Default s90 p0740

Hi I have P0740 on my S90. I changed the torque convertor, but after 6 months , the P0740 coma back again. Please help! Thanks!
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