2003 Chrysler Town & Country will not start. Key dance give P1684 code. Was sluggish to start and now does not start. Speedometer is not working. Seems to be connectected. What's the problem. Battery is good.

1684= BATTERY DISCONNECTED WITHIN LAST 50 MILES.
1698 PCM FAILURE EEPROM WRITE DENIED ALSO
1698 NO CCD MESSAGES FROM TCM/ OR BCM

P1684 Battery Disconnected in the last 50 Starts


P1389 No ASD Relay Output Voltage at PCM

check engine light on means one or more DTCs are stored in the engine control model.
maxiscan us703 can help you clear the fault codes.

P1491 Radiator fan relay control circuit, Most likely you need a fan relay or fan module.
P1684 Battery was disconnected, this code will not turn on CEL

If the vehicle runs fine other than the P1684 code then it is probably the result of the battery being disconnected sometime in the recent past.
Hope this helps.

302 is misfire on cylinder 2. Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires .
1684 is battery disconnected, which you caused when you disconnected it--you can ignore that. You probably have an intermittent misfire. Please follow my troubleshooting steps and let me know if you have questions.

P0456 is a small vacuum leak - see if you can trace down the vac lines for inspection according to the diagram that's on the sticker under the hood (it should be near the end of the hood prop on the covering over the radiator). I just took a picture of my 2002 Chrysler Town & Country but to get it small enough to upload you can't read the detail.

P1684 is an easily trigerred code that is from a diagnostic reader or battery issue - not 100% sure of it's cause but it does not trip the engine light.

sit in the drivers seat close the door. with the key off hold the trip odometer button in then while holding the button in turn the key on. if done correctly this will put the MIC (mechanical instrument cluster) into a self test. if the speedometer does not move like the rest of the gauges during this test the MIC must be replaced. if the speedometer does move it is likely your problem will be fixed, however, if the speedometer does move but it does not start working properly then further diagnostic will be needed.

It is the speedometer that doesn't work? What problem do you have? Does the transmission shift or is it stuck in 2nd?