Recently my odometer display prompt out "error".
Speedometer needle and rpm needle not moving.
This will happen intermittently.
I realize this problem firstly happened when my car could not start after an overnight parking.
Secondly, distance mileage will automatically reset to 'zero" after 30 km.
I checked with the dealer(gm) and they told me it's the ecm (electronic control module)malfunction since my car model do not have any bcm (body control module).
Any advise if i still driving this car without changing for time being.

 

The speedometer can fluctuate rapidly under normal driving conditions when the car's speed changes abruptly, but sometimes the needle can start swinging around the dial without any fluctuation in speed. If the hairspring comes loose or breaks, it can't hold the speed cup in place, and the result is a fluctuation in the dial. In electrical speedometers, if the circuit that counts the magnetic pulses fails, it can cause the speedometer read-out to vary from the actual speed and to shoot upward or downward without notice. If a speed sensor in the automatic transmission starts to malfunction, it can affect the speedometer and cause fluctuations. In these instances, either the speedometer or the sensor needs replacement.