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2000 S70 Rough idle, limp mode, brake lights on without key

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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Nanat
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Nanat

2000 S70 Rough idle, limp mode, brake lights on without key

Post by Nanat » Mon Oct 14, 2019 5:15 am

I have an S70, year 2000. We have replaced fuel pump, fuel pump relay switch, alternator and ignition switch. It will not go over 45 mph, brake lights are staying on ( even when car is off). My husband says it's stuck in limp mode. Any idea what is going on? Please help.



RB3
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Re: Rough idle

Post by RB3 » Mon Oct 14, 2019 10:42 am

I'm curious as to the problem or problems that initiated the repairs so far. Did a shop do the repairs? Do you have codes? How old is the battery? Have you checked for bad ground?



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abscate
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Re: 2000 S70 Rough idle, limp mode, brake lights on without key

Post by abscate » Mon Oct 14, 2019 10:52 am

Thats lot of stuff going on, and the limp mode might even be caused by the brake lights. On my 1999, activating the brake with your foot on the pedal only works for about a second before the ETM turns off the throttle command function - like most cars today.

Lets work on the brake lights first - was there any work done on the car to trigger this?


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