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Just turned 6k miles on truck. No problems until now. Started it and started down the road and noticed speedometer said 45 when I wasn't even going 30. Temp read about 185 and it had only been running approx. 1 minute. RPM read about 2k when coasting and after stopping. while stopped speedometer still read approx 18. turned engine off and still said 1200 rpm and 15 mph. Went about 7 miles then parked back in driveway. Started later in the day and gauges were fine. Worked fine over the weekend. Now today (Mon) started truck and the PRND123 lights would not come on. Turned off and sat a minute then restarted and same thing. The engine hours reset to 0. The trip meter would jump all over as I was driving. The odometer seemed pretty stable but would drop to 0 and then back up again once in a while. Is my truck possessed?

2005 D/A Reg Cab totally stock 4x4 stripped down work truck.
 

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Sounds like maybe a bad ground or bad instrument cluster. Either way the dealer will have to look at it. Hopefully it is acting up when you take it in to them.

PRND123 indicator could also be the NSBU switch.
 
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