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V70 "reduced engine performance' when using cruise V70-XC70

posted by  Indy452 on  Mon Mar 13 07:05 CST 2017
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last visit: Tue Mar 11 08:25 CST 2014
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2003 V70 2.4t On certain occasions when using cruise control especially when climbing an incline the engine will abruptlly go to "reduced engine performance" mode. Its quite shocking at first when it happens and there better not be someone tailing you when it happens on the highway....

It seems to happen most frequently on two lane highways where there are more sharp hills, Seems to not happen on interstate highways where hills are gradual.

The car abruptly will loose all power and the transmission goes into a lower gear or something and the engine seems to run rough.. The only way back to normal performace is to immediatelly pull over and shut off the engine then re-start. Once re-started, all is fine again.

What is going on here? Is it a defective mass air flow sensor or something else? Seems to be fine when the cruise is off while accelerating up hills...Only happens with cruise "ON".

Need too get this fixed cause my wife refuses to use cruise...Quite frankly, I don't either..

Thx.








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    V70 "reduced engine performance' when using cruise V70-XC70

    posted by  KlausC on  Mon Mar 13 10:17 CST 2017
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    last visit: Fri Oct 24 10:15 CST 2014
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    I have found that 'cruise' will give it more throttle than you would manually under the same circumstances. Losing 1 or 2 mph while going up steep hills is no big deal for the driver, but 'cruise' will try its darndest to keep the speed - try hitting resume at 35 when it is set to 65!

    For others with the same error message, it has meant either a through cleaning of the throttle body and/or replacement of the Electronic Throttle Module $$$! If you clean it, try to also clean the throttle position sensor.

    --
    Keeping it running is better than buying new







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