The electronic throttle module (ETM) has a higher than normal failure rate. There is a possible extended warranty and/or a software upgrade offered by Volvo for this problem.Google+
Car Problem Reports
Volvo V70 XC Volvo Extends Warranty on ETM Due to High Failure Rate
Volvo V70 XC Problem
Average Mileage: 140,776 mi (80,000 mi - 172,000 mi)
I had the same problem and on my car the TPS fixed the problem. I found that on my 2001 xc v70 it is hard fixed to the throttle body. I went to a gunk yard and replaced the entire throttle body. That fixed my issue. Rather than spending $200 to $500 I spent $100.
Visitor, 2001 Volvo V70 XC, 136,000 mi
Going up hills while holding the throttle at a constant pressure, the engine surges, then slows down, over and over and over until the top of the hill. Getting worse...I fear immanent failure soon. And Volvo only will replace if the car is under 10 years old. Which is ludicrous as ALL of these Volvo's will fail.
Visitor, 2000 Volvo V70 XC
i throttle the gas and nothing happens..
Visitor, 2000 Volvo V70 XC, 139,560 mi
Goes in and out of "Limp mode" ETS light comes on, car will not accelerate, it will after "pumping peddle" sometimes though. Does not always start but usually does after several tries. Very unreliable, only dare to drive it within a mile or so, I'm 65 this year and wanted this to be my last car, don't know about that.
It sure is a nice driving car and totally rust free, plenty of power before this started, I really like the thing. I don't know what it needs though. It has not been fixed yet, I live on a tight budget and not sure when this will get done.
Visitor, 2001 Volvo V70 XC, 139,877 mi
After several trips to Stadel Volvo replaced the Electronic Throttle Module. Total charges $618.11. One year later now i am having troouble with long shifting between gears, hard shifting, and the car will lunge forward with foot on the brake. Stay tuned.
Visitor, 2000 Volvo V70 XC, 160,000 mi
ETS light comes on, power declines, acceleration unavailable (car goes about 30mph)- turn car off for about 10 minutes and it goes back to normal... until the next time it does it. dreading the repair cost :(
rpm drops from 9000 to 5000 and sometime stalls while in traffic.