Speedo Failure
Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,549
Likes: 1
From: Roanoke Virginia
Speedo Failure
Anybody have a speedo fail to "0", just to return some seconds later? Happened three times on me. ALWAYS turns on again downshifting to THIRD! (WTF?) The HUD, speedometer and OBDII output (see below datalog) all fail simultaneously. Note on the graph the erratic response after the speedo restarts.
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
I have this same problem but only at WOT. Its freakin crazy. The reader will also not pick it up. Im not sure if it has something to do with the mods like the car is speeding up so fast it cant read it or what. I hope to find a fix for it soon.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Im very familuar with the C5 serial data buss but have yet to mess with the C6 serial data CAN Buss.
I bet ya it has something to do with that buss. On the C5, the buss can short out and cause all sorts of weird sensor and IPC issues.
Just something to consider. I too have a C6 and sooner or later, Im going to have an issue thats going to cause me to have to dig DEEP into the service manual just like I did in my 98 Coupe and figure out what the CAN Buss is doing.
No major issues so far! (KNOCK ON WOOD!!
)
BC
I bet ya it has something to do with that buss. On the C5, the buss can short out and cause all sorts of weird sensor and IPC issues.
Just something to consider. I too have a C6 and sooner or later, Im going to have an issue thats going to cause me to have to dig DEEP into the service manual just like I did in my 98 Coupe and figure out what the CAN Buss is doing.
No major issues so far! (KNOCK ON WOOD!!
)BC
Instructor
Joined: Jan 2009
Posts: 166
Likes: 0
From: Kansas
Have you found an answer?
I have the same Speedo problem with my 08 Z51. It happens on track as I crest a hill at about 120 in third. I'm in Competition mode. My car has the telescoping and tilt steering wheel. I'm also receiving the service active handling DIC message but have been unable to replicate it on the street. I've read the issues with this message and the investigations going on but am hesitant to bring it into the dealer because of my inability to replicate it on the street.
Any thoughts or wisdom?
I have the same Speedo problem with my 08 Z51. It happens on track as I crest a hill at about 120 in third. I'm in Competition mode. My car has the telescoping and tilt steering wheel. I'm also receiving the service active handling DIC message but have been unable to replicate it on the street. I've read the issues with this message and the investigations going on but am hesitant to bring it into the dealer because of my inability to replicate it on the street.
Any thoughts or wisdom?
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
The speedo works fine driving around town & etc..... go figure
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
Ah yes the vehicle speed sensor. Yup it is fine! I am wondering if there is something missing in HP tuners that would fix the problem. But it only happens at the track so until it affects my everyday driving I'll leave well enough alone.
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Drifting
Joined: May 2008
Posts: 1,621
Likes: 2
From: Petal Ms
St. Jude Donor '08-'11
Same here. Bugged me a little at first because I like to see where I am at going through the traps ha. I checked my speed sensor too and everything was good.
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
Ive also heard the speed sensor thing. But if that was broken wouldnt the speedo not work all the time? Im pretty dang sure if it was broke it would be broke all the time not just when you step on the gas.
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
Safety Car
Joined: Jan 2008
Posts: 4,711
Likes: 3
From: Middle of No where AK
Yeah I checked mine too and there were no problems either. I have no clue why it doesnt work. Ive asked countless people and no one can seem to diagnose it.
Le Mans Master
Joined: Aug 2004
Posts: 5,259
Likes: 16
From: Monroe Township New Jersey
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
St. Jude donor in memory of jpee '14
.......... Actually there must be something that we all are missing as I know of several others with the same problem.There may be something which needs to be changed that the tuning programs can not change.
Instructor
Joined: Jun 2010
Posts: 135
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From: Both Coasts
