Dodge Cummins Diesel Forum banner

1 - 9 of 9 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter #1
My 2006's tachometer changes range every once in a while (example: idle 650rpm with 75 mph being 2400rpm and then it just changes to idle indicating 300rpm and 75 mph indicating 3200rpm) then all of a sudden it will change back to being normal. Any ideas? All connections seem to be ok, truck runs ok otherwise.
 

·
Registered
Joined
·
460 Posts
Hmmm...that's interesting, I'm having the same problems....maybe.

I've noticed, that occasionally, it will show 300 rpm at idle...and it's idling just like normal at 650. Also, when i'm running down the road, say at 50mph and I let off the fuel to coast with traffic...the rpms drop to 650rpm and then drop again to about 400rpm with no change in sound from the engine. Just started noticing that about 2 weeks ago. I haven't noticed the 75 mph rpm's changing, but i'll pay more attention this week going to work and see if anything changes there too. Thanks!

Any hints anybody?

Joe
 

·
Tech Specialist
Joined
·
459 Posts
try to do a needle sweep of the cluster - make sure the tach changes correctly - with the key in the off position, push the reset button on the cluster, while holding the reset button, turn the ignition on, all the lights and needles will perform a sweep of various ranges - good luck
 

·
Registered
Joined
·
460 Posts
Ok. did that. Now just wait and see if it continues to act up again?
Everything swept to max, then stepped down until everything reset back to normal.
 

·
Registered
Joined
·
6,527 Posts
try to do a needle sweep of the cluster - make sure the tach changes correctly - with the key in the off position, push the reset button on the cluster, while holding the reset button, turn the ignition on, all the lights and needles will perform a sweep of various ranges - good luck
I thought somebody once said you could see the hour meter a similar way . Any truth to that????:peelout:peelout
 

·
Registered
Joined
·
583 Posts
if you have the odometer on the display and hold the reset down it will show engine hours... acutally it will show ignition hours.
 

·
Registered
Joined
·
460 Posts
ok, so i did the needle sweep and when i fired it up today, the tach read 300rpm for about 30 seconds and then it went to 450 and stayed there until i put it in gear and took off. Does this have anything to do with a sensor?

thanks for the help'

joe
 

·
Registered
Joined
·
6,527 Posts
if you have the odometer on the display and hold the reset down it will show engine hours... acutally it will show ignition hours.
Thank you.. I finally got to try it today. 12,000 miles and 422 hrs. I'm pretty sure that is the first accurate piece of information I have gotten off of this forum to date. Lets just say there is a lot of not so accurate info out there...:rof:rof Again, thank You..
 

·
Registered
Joined
·
460 Posts
try to do a needle sweep of the cluster - make sure the tach changes correctly - with the key in the off position, push the reset button on the cluster, while holding the reset button, turn the ignition on, all the lights and needles will perform a sweep of various ranges - good luck
Anything else i could try?
 
1 - 9 of 9 Posts
Top