Question about 2003 Volvo S80

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My 2003 Volvo S80 cruise control workds sporadically.

My 2003 Volvo S80 cruise control initially operates correctly, and then disengages after 5 to 10 minutes - and will not reactivate until the ignition has been turned off. Thereafter, the same pattern recurs.

Your solutions to this irritating problem would be much appreciated!

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  • edward_moss Apr 14, 2009

    Many thanks for this input Roy777. Do you know for sure that the actuator is adjustable - and where this adjustment is performed? I am asking these questions because I feel at the mercy of the Volvo service agents - who tend to replace electronic modules without thought, at great expense!

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On my 2002 S80 T6, the problem is the brake booster diaphragm position sensor's failure (Volvo 2002 S80 T6 part #31261486--other years, models might be different). This is essentially a piston-driven potentiometer that tells the cruise control system when you've applied the brakes, signaling it to switch off control of the throttle. It's mounted on the back of the brake booster with a wire circlip. It's not easy to get at, and I had to remove the cross-brace between the shock mounts to get at it more easily. The part's about $90 from online parts sources, more at the dealer, plus my dealer wanted a king's ransom to install, $400, parts and labor! While not easy to get to, it's fairly easy to replace--just BE SURE to pump the brakes a lot, engine off, before removing it so that residual booster vacuum won't **** the rubber o-ring around the sensor's cylindrical body into the booster chamber. Hardest, most aggravating part is removing and replacing that steel circlip that holds the sensor in place. Dropping that little steel band into the back of the engine bay kicks off a whole new adventure!

Posted on Dec 05, 2009

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IT SOUNDS LIKE A PROBLEM IN THE ACCUATOR MIGHT NEED ADJUSTMENT OR PROBLEM IN THAT CIRCUT

Posted on Apr 14, 2009

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If you get ABS/STC codes on your dash at the same time it may be the ABS module. The symptom you describes with the codes necessitated a repair of my ABS module. I went to vicrocha online and had mine back in less than a week and works now after 5 years

Posted on Aug 30, 2009

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Posted on Jan 02, 2017

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