SOURCE: 1999 Dodge Caravan posts trouble
The p1698 code is for the (bus) that is how the computers commmunicate with each other and also how the scan tool talks to the computers.
There is a common problem with these vans, that would be a good place to start. The battery will leak acid onto the wires underneath the battery. If you remove the battery and battery tray you will be able to see the large wiring harness under the battery. Inspect all of the wires underneath the battery for damage.
SOURCE: OBD II Code P1756.
Could be a bad sensor, but it's transmission related. Anything affecting internal trans pressures should be taken care of by a reputable trans shop.
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