My husband and i both have 2004 impalas, the odometer is acting up sometimes it works and other times it freezes on a speed. my husband will turn the key like he is starting the car a number of times to get it back to zero.
what can we do
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It sounds like a loose connection. When it warms up, the heat causes expansion and allows the circuit to be completed. This could be at the resistor pack / speed control. In any case, you might want to read this discussion:
The turn signal flasher and hazard flasher are both incorporated into the hazard switch on the dashboard (yeah, they saw the money possibilities there). This is a common problem with the Impalas. Sometimes slowly pressing and releasing the hazard switch a few times will correct the problem. I have been told by some that if you get electrical contact cleaner and spray it into the hazard switch it helps also, Apparently dirt gets in and does the damage. Replacement of this hazard switch will fix this if nothing else works.
try removing radio, ive had 3 impalas that drove me crazy! daignosing, they would drain the battery if car sat a weak,ending up being the radio shorting inside, dont know if thats your problem but i would start there, dont remove fuse have to remove the radio! hope this helps.
Sounds like the vacumn modulator isn't connected. Like the hose has come off, or there is a tear in the hose. (4t60-E transmission)
4t65-E transmission is a different ballgame. Check the electrical connector to the side of the tranny. Make sure it's plugged in tight, and there is no corrosion on the connectors. Past this point it's time to check sensors. WSS, (Wheel Speed Sensor), and VSS, (Vehicle Speed Sensor) Make sure these connections aren't corroded, and are on tight on both transmissions. (Don't know which one you have. 4t60-E, or 4t65-E. I suspect you have the 4t60-E. It will state this on the transmission oil pan in raised letter/numbers)