S70 GLT

The ETS warning light came on today while accelerating hard, and stayed on. Was off the next time we started the car. The manual basically says "if it stays on after you stop and start the car again, take it in for service".

Well, the light isnt on any more.

Is this something that will set a useful fault code for a tech, or should I just ignore it as the manual states?

Thanks!
KC

the other replies are correct,but some times a bad battery could be the cause

95% chance its a bad electronic throttle module (ETM). It will store a code.

Could someone please explain what a bad ETS module means? Solid state electronics (from my knowledge) are either good or bad. Bad meaning they dont work. Mine still appears to work. Does this possibly imply a faultly/flaky sensor or connections? Would the stored code indicate a specific sensor or control module failure?
Thanks!
KC

They fail often on '99-01 Volvo cars, very very common. It's the electronic throttle module but the unit will usually have a code for "internal fault" which means "REPLACE". Replacing the unit is the only solution then. Sometimes it sets the light and you might not notice driveabilty problems right away but eventually it'll act up. You also can't replace the part yourself as the new throttle unit won't work until software in installed by Volvos Vadis cart (dealer only). Even if you or another shop replaces the part, the car won't run until SW is installed so you'ld then need to have it towed to a dealer. Might seem strange, unfair, uncool, etc BUT true.