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Jim Grant's Tech Tips
Chrysler Town & Country, Blinking Computerized Dash
Q: At just about 100k miles the dashboard started shutting down on my
Chrysler Town & Country. It seemed as if it was one thing at a time,
speedometer, cruise, etc.. I took it to the dealer. They told me it
was a bad board and would cost $800 to correct. He "reset" the
computer and the car was working fine, but he wouldn't guarantee for
how long. About 9k miles later the van was starting to act funny
occasionally when driving the speed o meter would go to zero, engine
power completely cut out for ~1/2 second and then be fine. Is this a
computer problem? Or is it a connection to the computer?
- Carl
D.
A: The first problem/condition you reported was likely due to a body
computer problem. The body computer in your vehicle is known for
wigging out. When this happens the dash display goes haywire. "Note;
haywire & wigging out are technical terms for something not working
right." When the body computer has its fit anything from the dash
display to your interior lighting can be affected. Problems with a
body computer can range from just a bad day to circuit failure, with a
few items in between. Body computers sometime will get better after
the key has been off for a while, like over night. Other times the
battery has to be disconnected for a short time for the body computer
to get its act back together. Over the years software updates have
been needed to get the body computer back in line. Last but not least
the body computer just has to be replaced. The replacement will also
have the latest and greatest software update for your vehicle. You
cannot go to a junkyard for a used body computer and it is unlikely an
independent repair shop can help. The equipment and software required
is found at the dealership. As for the engine seeming to cut out with
the sudden drop of the speedometer there is the possibility that the
vehicle speed sensor is failing. The engine and transmission computer
need vehicle speed information. If the signal is lost the engine and
transmission computer go into a panic. The body computer really
doesn't care much about their problems, but without vehicle speed
signal the body computer will just report 0 MPH on the display. If
the signal comes back the body computer is okay with that and will
display the vehicle speed again. Have a code check performed; if
there is vehicle speed sensor code there is a good chance you just
have a failing sensor.
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