PCM Mileage Wrong?
Thread Starter
|
Registered User
Joined: Feb 2011
Posts: 81
From: Charlotte, NC
Rep Power: 19
PCM Mileage Wrong?
Does this seem right? I have not reset my PCM trip total nor my total trip menu. All the information on them is basically the same except the mileage. I have driven the Cayenne ~7875 miles since I bought it.
I'm guessing I need to bring this to the attention of my service guy.
I'm guessing I need to bring this to the attention of my service guy.
Registered User
Joined: Dec 2012
Posts: 1,197
From: NoVA
Rep Power: 76
Wow that is a hell of a difference 
When you reset that page on one, it resets the other too.
I reset my overall meter every fill up as I track my mileage and MPG closely, so I haven't seen anything like that. I have seen discrepancies though. I have seen the miles differ up to 5 miles and I have seen them both be about 2 miles off the odometer trip meter (I also reset that each time. Additionally I have seen the MPG readings differ as far as 3 MPG between them. Basically the MFD and PCM as unless pieces of garbage.
I can't get my dealer to care about it and they give me excuses about different data sources and other BS. Hopefully yours will treat you better since that is far more significant...
When you reset that page on one, it resets the other too.
I reset my overall meter every fill up as I track my mileage and MPG closely, so I haven't seen anything like that. I have seen discrepancies though. I have seen the miles differ up to 5 miles and I have seen them both be about 2 miles off the odometer trip meter (I also reset that each time. Additionally I have seen the MPG readings differ as far as 3 MPG between them. Basically the MFD and PCM as unless pieces of garbage.
I can't get my dealer to care about it and they give me excuses about different data sources and other BS. Hopefully yours will treat you better since that is far more significant...
Registered User
Joined: Jul 2014
Posts: 255
From: Seattle
Rep Power: 23
PCM Mileage Wrong?
I think I read somewhere that one is based on GPS data and one from the odometer, which may explain a small difference. But nothing that far apart.
I don't recall where I read the GPS comment, so take that with a grain of salt.
I don't recall where I read the GPS comment, so take that with a grain of salt.
Thread Starter
|
Registered User
Joined: Feb 2011
Posts: 81
From: Charlotte, NC
Rep Power: 19
I understood there would be differences in distance and mpg a little because one is wheel based and the other GPS...is this not true? In my case though at some point the PCM just got hosed on the distance. I don't believe it has been like this all along.
Registered User
Joined: Feb 2005
Posts: 26
From: Westfield, IN
Rep Power: 24
The MFD would seem to be correct/closest based on the average speed and the ride time. A possible cause for the discrepancy could be due to tire size if those were changed but that's probably not it. I haven't checked mine in quite a while so it will be interesting to see if it matches since my last reset several months ago.
Thread Starter
|
Registered User
Joined: Feb 2011
Posts: 81
From: Charlotte, NC
Rep Power: 19
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
jaehoppa
Automobiles For Sale
3
Oct 22, 2015 09:17 PM
nb6179505
997
0
Sep 14, 2015 04:45 PM