Speedometer reads various speeds when stopped
07-12-2018, 01:09 PM
#1
Rennlist Member
Thread Starter
Speedometer reads various speeds when stopped
Intermittently, the speedometer will read from 40 mph to 140 mph when sitting at a dead stop.
You can watch it vacillate all over the place, then it goes back to zero.
Happens only once in a while.
You can watch it vacillate all over the place, then it goes back to zero.
Happens only once in a while.
07-12-2018, 11:13 PM
#4
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Location: Spring Lake, NJ, US of A
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It would be interesting to hook a PIWIS or iCarScan or Durametric up to it and see what the gateway thinks the speed is when that happens. It could be something odd like a bad ABS/PSM sensor on a wheel or the wiring to it causing spurious signals..
07-13-2018, 04:43 PM
#5
Does it happen after the car has gotten wet? If so, you may have water leaking into the car from the roof drains or elsewhere.
957s draw current from the battery for a time after you turn the car off... starts around 10 amps and drops steadily to almost zero after 8-10 minutes. If you lock the car, battery drain stops immediately (other than that small draw for the security system). If the speedo is registering anything, it would have to be because there is a short somewhere providing power... water is a common issue with odd problems like this.
957s draw current from the battery for a time after you turn the car off... starts around 10 amps and drops steadily to almost zero after 8-10 minutes. If you lock the car, battery drain stops immediately (other than that small draw for the security system). If the speedo is registering anything, it would have to be because there is a short somewhere providing power... water is a common issue with odd problems like this.
07-13-2018, 05:12 PM
#6
Rennlist Member
Thread Starter
Does it happen after the car has gotten wet? If so, you may have water leaking into the car from the roof drains or elsewhere.
957s draw current from the battery for a time after you turn the car off... starts around 10 amps and drops steadily to almost zero after 8-10 minutes. If you lock the car, battery drain stops immediately (other than that small draw for the security system). If the speedo is registering anything, it would have to be because there is a short somewhere providing power... water is a common issue with odd problems like this.
957s draw current from the battery for a time after you turn the car off... starts around 10 amps and drops steadily to almost zero after 8-10 minutes. If you lock the car, battery drain stops immediately (other than that small draw for the security system). If the speedo is registering anything, it would have to be because there is a short somewhere providing power... water is a common issue with odd problems like this.
Seen it happen on dry days. Interior is dry, too, but I did have a drain clogged on the passenger side that soaked the carpet when I first got the vehicle.
There are other problems. The footwell lights flash randomly at night. None of the interior overhead lights work at all (except those in the tail gate.
I just replaced all four ABS sensors, so I'll wait and see if the speedo problem returns, but that, obviously, had nothing to do with the interior light show.
Don't know what harnesses run on the passenger side.
