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How can an engine code clear itself?

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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How can an engine code clear itself?

Post by litewait » Sat May 23, 2020 8:25 am

See my other post about my S80 throwing P2135, the code cleared itself somehow. Why would that be?

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Re: How can an engine code clear itself?

Post by SuperHerman » Mon May 25, 2020 9:46 pm

Basically codes are of three types 1) Actual part has failed (code will not clear until part/sensor replaced); 2) intermittent failing part (code will come and go); or 3) code caused by the computer reading an issue which has resolved itself.

Possible causes for a generic P1235 code are: Faulty Fuel Pump or related module; sensor or related wiring is open or shorted; bad wiring in the circuit, or another faulty module

Your issue could be either 2 or 3 - maybe bad gas or some debris in an injector that was cleared via use. I would keep an eye on it and see if it comes back. One thing about generic codes (not VIDA or Volvo scanner specific) is many false codes.

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Re: How can an engine code clear itself?

Post by MoVolvos » Tue May 26, 2020 8:35 pm

I believe every car should have a drive cycle where the computer checks for faults. As Super says if the computer sees that the reading is Okay it will remove the light / fault code.


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Re: How can an engine code clear itself?

Post by ndphotonl » Wed May 27, 2020 9:10 am

If you check it with DICE, it will probably still be referenced over there. Not all codes are visible with something like Torque Pro app or a universal code reader.
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