2000 GMC Jimmy keeps running (sometimes -- intermittent)

About once in every five times i drive my 2000 GMC Jimmy, it keeps
running after I turn the key to the off position. The dashboard goes
out (all of the gauges stop working, too) but the engine keeps right
on running. The first time this happened I pulled the fuse to the ECM
and it stopped right away.

Here's the really odd part: out of desperation, I tried every button
in the cab the next time it happened. Lo and behold, turning the
hazard light on and off kills the engine. I also noticed that
sometimes I'll have my foot on the brake when I turn the engine off,
and the engine will keep running until I take my foot off the brake.

This may be related, I don't know: the right turn signal comes on an
stays on (doesn't blink). I tried replacing the blinker module behind
the glove compartment, but that didn't change anything. Left turn
signal works, and occasionally blinks fast like there's a bulb out,
then goes back to normal after a while. All the bulbs are fine.

Any thoughts?

wrote:
> About once in every five times i drive my 2000 GMC Jimmy, it keeps
> running after I turn the key to the off position. The dashboard goes
> out (all of the gauges stop working, too) but the engine keeps right
> on running. The first time this happened I pulled the fuse to the ECM
> and it stopped right away.
>
> Here's the really odd part: out of desperation, I tried every button
> in the cab the next time it happened. Lo and behold, turning the
> hazard light on and off kills the engine. I also noticed that
> sometimes I'll have my foot on the brake when I turn the engine off,
> and the engine will keep running until I take my foot off the brake.
>
> This may be related, I don't know: the right turn signal comes on an
> stays on (doesn't blink). I tried replacing the blinker module behind
> the glove compartment, but that didn't change anything. Left turn
> signal works, and occasionally blinks fast like there's a bulb out,
> then goes back to normal after a while. All the bulbs are fine.
>
> Any thoughts?
>

Bad multifunction switch in the column.

--
Steve W.
Near Cooperstown, New York