1998 chrysler concorde

the p1647 is not a dodge code please check again by turning the key to the on position and off three times the third time your odometer will show you the codes

No generic code reader will read anything other than PCM/ECU codes, and sometimes ABS codes if you spend a little extra money.

The 1998 Chrysler Concorde also didn't have a instrument cluster that was controlled by the Body Computer. (BCM)
If your speedometer is working occasionally, then chances are that there is a intermittent short in the wiring or that one gauge is just going bad.

While you're driving or when it happens, try to pay attention to what makes it happen... Hitting bumps in the road or hitting the dash with your hand will be a sign of possible bad wiring.
If it worked when you shut the car off, and then doesn't work when you start it back up the next day could mean that the speedometer and/or instrument cluster is going bad.

this is code for the AMBIENT AIR TEMP SENSOR which as i understand controls the interior heating/cooling , try this link
http://www.2carpros.com/questions/chrysler-concorde-1998-chrysler-concorde-auto-temp-contro

When you replace the batteries in a key fob (or if the car randomly "un-syncs" with fob) you usually have to reprogram (kind of a sync) the fob to the car. Each manufacturer is different and usually involves turning the key over a certain number of times ( like 8) then operating the fob in a certain way like holding the lock button down for three or so seconds. I found out how to do mine on YouTube. You can search there for your specific re-syncing format or call a local Chrysler dealer

it means your car has the obd2 code problem, you need a scan tool to diagnose the code, and then delete the code, i know this tool is helpful for your car. or you can take it to the chrysler dealer, they will check for you, hope help.

2.7? Try unhooking the cam sensor? Also if it does start after unplugging the cam sensor, don't drive it. Post back.

If no engine cranking (Turning over) then starter / battery / wiring fault. If ignition lamps work with key on and DO NOT DIM when starter is activated = faulty starter or wiring to it. If lights dim and chattering / click is heard = flat faulty battery.

It means that intermittently you are losing the signal from your camshaft position sensor (CMP) And you are also losing the the crankshaft position signal sensor (CKP). these are magnetic or hall effect sensors that go out sometimes and are necessary or you could have a poorly running vehicle or it may not run at all. hope this helps you out!!!

Code p1698 means there is no digital data being recieved from the transmission control module to the power train or the other way around.
Take it and have the wire harness checked between the two modules, might have bad connection or bad wire. Also have the two modules checked, one might be bad.
They are expensive, so it's best to find out which one is bad, if it's not a bad wire, or dirty connection.

Speedometer quit working-consider vehicle speed sensor.