Gauge cluster pegout at startup
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Joined: Jun 2003
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Gauge cluster pegout at startup
I have a 99 Expedition XLT w/ 66k. One of the problems I'm having is that when I start the truck while the engine is cold, every gauge in the cluster pegs out until the chime stops. Any suggestions would be greatly appreciated! 
Postmaster
Joined: May 2002
Posts: 3,028
Likes: 1
From: Annapolis, Maryland
Gauge cluster pegout at startup
That means your ECU is resetting itself. This problem has been discussed before, but I can't remember the fix. It has something to do with the ECU not getting a constant source of power. I would do a search about needles jumping and see what you can find.
I can't think of any real detrimental effects of the ECU constantly resetting itself, but the transmission might shift funny because it has a learning program (takes about 500 miles or so) that tailors the shift characteristics to your driving habits. Everytime the ECU is reset (usually through disconnecting the battery for 1/2 hour), the program has to start over.
XXL
I can't think of any real detrimental effects of the ECU constantly resetting itself, but the transmission might shift funny because it has a learning program (takes about 500 miles or so) that tailors the shift characteristics to your driving habits. Everytime the ECU is reset (usually through disconnecting the battery for 1/2 hour), the program has to start over.
XXL
Last edited by BigMattXXL; Jun 22, 2003 at 03:25 PM.
Gauge cluster pegout at startup
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
Gauge cluster pegout at startup
Probably just your battery going bad. What you described is a classic example of this. The ECU is the PCM or Powertrain Control Module which is the computer that runs the show.
