Odometer memory not workin

Odometer
The instrument panel cluster (IPC) displays a season odometer and a trip odometer. Momentarily press the trip/reset switch in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer. The odometer is calculated and stored electronically in the body control module (BCM). The BCM uses the vehicle speed information from the engine control module (ECM) to calculate the odometer. The odometer displays 'error' if an internal IPC memory failure is detected. The IPC stores a backup copy of the odometer value incase the IPC stops receiving a valid odometer value from the BCM. The odometer will display 'error' if an internal IPC memory failure is detected.

Your best bet , take it to a qualified repair shop .

Odometer
The odometer is an electronic digital display. Digits displayed are illuminated by the odometer backlight bulb. The odometer backlight bulb brightness is controlled by class 2 messages from the BCM to adjust the display for daylight and instrument panel dimming operation. The trip odometer and total odometer will show in this display area. The push button in the lower right side of the speedometer is used to toggle between the trip and total odometer readings. To reset the trip odometer, push and hold the button down for at least two seconds. The total odometer display has six digits with no decimal display. The trip odometer has four digits including a decimal point and indicates tenths of a mile or kilometer.
The body control module (BCM) stores the vehicle mileage. If the BCM fails, the cluster will display the last valid mileage that was sent before the BCM failed. For replacement of the BCM refer to the BCM section of this service manual. Replacement instrument clusters do not require odometer pre-setting before installation. If the instrument cluster is replaced, the mileage stored in the BCM will be sent to the new cluster via serial data, and shown in the odometer display.

Your best bet , take it to a qualified repair shop.

Hate to say it, but, you may want to have it professionally diagnosed. Sometimes when you have a lot of issue occur like this at one, it could be a BCM (Body Control Module). Looking for one at a salvage yard can be very difficult due to the variations of BCM's among vehicles even of the same model.

Sounds like a problem with the clocks itself as it carryies it own memory and computer ,

This is right from GMC service repair manual
Odometer
The vehicle odometer is calculated and stored electronically in the instrument panel cluster (IPC). The base IPC contains a season odometer and a trip odometer. The uplevel IPC contains a season odometer and two trip odometers. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. Press the trip/reset switch for greater than 2 seconds, while the trip odometer is displayed, in order to reset the trip odometer.
The IPC calculates the mileage based on the vehicle speed signal circuit from the engine control module (ECM). The odometer will display 'error' if an internal IPC memory failure is detected. The odometer displays either miles or kilometers as requested by the activation of the Personalization button on the steering wheel controls.

Check your fuses, you may have one blown that controls the constant voltage to the units which rewuire memory, and therefore need 12v all the time.

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this is most likely due to the Vehicle Speed Sensor malfunctioning, this will set the check engine light and cause the Odometer issue as well, have a system computer test run to see what trouble code is stored in memory, that will pin it down.

My nephew has a 96 taurus also when his radio went out he noticed that his speedometer was not working as well so we check the fuses under the dashboard and found that a fuse from the radio memory was blown . We replaced it and the radio and speedometer and the odometer worked fine

To reset the message displays, turn the ignition switch on. Press and hold the odometer reset button "A" located below the speedometer. Turn off the ignition while holding the button. "OEL" will display on the indicator. Press and hold the lower digital clock reset button "B" until five dashes appear in the display. If needed, press the odometer reset button until "IN 01" appears and then press the clock reset button until five dashes appear. If needed, press the odometer reset button until "IN 02" is displayed and then press the clock reset button until five dashes appear. To exit reset mode, turn the ignition switch on and when "IN 01" appears, turn the ignition switch off.



1. Switch ignition ON.
2. Press and hold odometer reset button below speedometer.
3. Switch ignition OFF and release odometer reset button. OEL will now
display.
4. Press and hold the lower digital clock set button or the analog clock set
button until five dashes (-----) appear in display.
5. If necessary, pree odometer reset button to proceed to the IN 01 display
(15,000 mile maintenence) and reset using the clock button.
6. If necessary, repeat procedure to reset IN 02 (30,000 mile maintenence)
display.
7. To end reset mode: switch ignition ON; when display IN 01 appears, switch ignition OFF.

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