300C 2005 Speedometer Inaccurate

Anyone else have a problem with speedometer inaccuracy? I've taken it to
the dealer twice. They say its within tolerance. At 70 MPH it is off 3-4
MPH per my GPS system (2). Recently this caused me to get a ticket when I
failed to read the speedometer and instantly add 4 MPH to it. My wife is
not likely to add the difference. The dealer has checked the computer to
make sure it is correct for the tires and so on.

I'm considering this is cause for a recall if other 300C's are also
defective. The thing is that most owners are probably oblivious to the
problem.

 

The last I checked I believe 6% +/- was the tolerance for speedometer
accuracy. I doubt very seriously that you were issued a speeding ticket for
going 3 to 4 miles over the speed limit. And as far as a recall goes, its
not a safety issue.

Glenn Beasley
Chrysler Tech

 

No, he probably thought he was going 3-4 miles over the limit when he
was actually going 8 miles over the limit. If that was the case then I
think
he makes a good case that he was, in fact, issued a ticket, since as you
point out, very few cops will write a ticket for 3-4 miles over the speed
limit.

I suspect your trying to make the point that he shouldn't have even tried
going over the speed limit at all, in the first place. I don't have a
problem
with that philosophy - as long as none of the drivers -in front- of me adopt
it. (Heh Heh)

I disagree. A responsible automaker would produce a speedo that reads
too HIGH rather than too LOW if they are going to produce an inaccurate
speedo. That would tend to reduce the drivers actual speed.

In any case, I don't understand why this isn't a solvable problem. Why
doesen't
the dealership simply program in a larger set of wheels into the car
computer?
The speedo will then read high and the driver will be saved from having to
think
when he is driving.

The interesting thing I think here is the OP is bitching that he got a
ticket since
his speedo is reading low - but I don't hear him bitching that he's getting
extra
mileage under his vehicle warranty since his odometer is reading low. Funny
how when the error is in their favor that they don't complain! ;-)


Ted

 

did anyone at the dealer check the pinion factor
this is what is used to match tire size to the computer parameters
what makes you sure the gps has the correct speed???

 

Do you get the same results when you use highway mile markers over a 5
or ten mile distance?

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')