Does anyone have any information such as estimated time to replace a speed sensor on a 99 C5? Also, is this an easy enough job to do myself? Also, any diagrams or information on where it is located so I can check the connection for cleanliness etc. The speedometer is starting to "bop" around and sometimes on occasson even goes to zero. It seems like it is about to fail and I want to be proactive. Thanks in advance.

 

I've not once heard of the sensor itself failing as I think its just a magnetic pickup device, but the connection to it on the differential has been known to come lose or develop dirty contacts.

 

It is located directly on top of the differental, slightly towards the passenger side.

Pull your trouble codes through the DIC before you start ripping out and replacing parts at random.

 

I didn't even know you could do that. Any info on how to do it and some translation for the codes. That is great info. I've just recently purchased my vette and just now getting my feet wet. Also, do you think a novice can replace the sensor, if needed?

 

Try this one!
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To enter the Diagnostic Display function perform the following steps in order:

1. Turn ON the ignition switch, engine OFF.
2. Press the RESET button to acknowledge any warning messages present.
3. Press the OPTIONS button on the Driver Information Center (DIC) and hold.
4. While holding the OPTIONS button press the FUEL button 4 times within a 10 second period.
5. System will first enter automatic display mode followed by the manual display mode.

The automatic display feature allow you to read each module DTC display function in an automatic display sequence. Each system module DTC will be displayed for 3 seconds followed by a 1 second pause before the next DTC is displayed in an automatic sequence. If no DTC information is sent to the IPC from the system currently displayed on the IPC, the IPC will display NO CODES for that system. At any time during the automatic display function, the manual display feature can be activated by pressing any button on the DIC except the E/M 5 button. The E/M 5 button is used to completely exit the DIAGNOSTICS mode at any time. If there is a communications problem between any system, the IPC will display NO COMM when the IPC is trying to communicate with that system. When all DTCs have been displayed for all systems, the IPC will display NO MORE CODES for 2 seconds then will enter the manual display mode, waiting for manual mode operation.

The manual display feature allows you to manually select each module DTC display function. The manual mode will automatically be entered after the automatic DTC display sequence is complete, or can be entered at any time during the automatic mode by pressing any button on the DIC except the E/M 5 (E/M 5 button is used to exit the DIAGNOSTIC mode at any time). When the manual mode is selected, the IPC will display the MANUAL DIAGNOSTICS mode message for 2 seconds, or until any button on the DIC except the E/M 5 is pressed. After the MANUAL DIAGNOSTICS mode message is displayed, the IPC will display the first system abbreviation and quantity of codes stored for that system, then the IPC will wait for further instructions. The buttons on the DIC provide the following functions when operating the on-board diagnostic feature in the manual mode:

DIC Button Function
FUEL 1 Previous DTC
GAGES 2 Next DTC
TRIP 3 Previous System
OPTIONS 4 Next System
E/M 5 Exit Diagnostics
RESET Clear DTCs

 

Great information! Thanks a lot!

 

Can you tell us the outcome of your troubleshooting? Did you clean your sensor or replace it?