2005 saturn ion manual transmission speedometer works but odometer does not work

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Speedometer
The instrument panel cluster (IPC) displays the vehicle speed based on the information from the body control module (BCM). The engine control module (ECM) calculates the vehicle speed based on the controller area network (CAN) serial data message indicating the wheel reference speed from the electronic brake control module (EBCM). The ECM sends a CAN serial data message to the BCM indicating the vehicle speed. The BCM sends a class 2 message to the IPC indicating the vehicle speed.
The speedometer defaults to 0 km/h (0 mph) when any of the following occur:
• The EBCM detects a malfunction in the vehicle speed sensor circuit.
• The ECM detects a loss of CAN communications with the EBCM.
• The BCM detects a loss of CAN communications with the ECM.
• The IPC detects a loss of class 2 communications with the BCM.

Having the vehicle scanned for codes would probably point you in a correct diagnostic direction .

if the speedometer works the defect is in the instrument cluster. If it does not then a diagnostic will be needed as there are several possibilities.

You have to check speed sensor,could be worn out.

Sounds like a bad speedometer sensor. Usually located on the transmission. The only way to fix the speedometer/odometer is to replace the sensor.

It sounds to me like someone left the speed sensor harness unplugged. This car has an electronic speedometer with no cable. Look around the transmision for a disconnected plug.

Hi:
the dash has seven or eight small bulbs illuminating the entire area, and approx 3 of them are for the speedometer/odometer area.

It seems odd that those are the first to go, but most likely the problem.
It often requires removal of the instrument cluster to swap bulbs. not too bad, but sometimes tricky.

i would suggest checking the fuses to see if an accessory fuse has burned. The box with the fuses is under the dash on the driver's side, but there is a chance this system's fuse could be in the fuse box under the hood by the battery.

Hope this helps,
matt

ck your drive belt. and fluid levels

Yes your speedometer, and odometer are controlled by your speed sensor.