What is code p1687

• P1693 - DTC Detected in PCM
• P1693 - Indicates a fault code has been generated in the companion engine control module.
• P1687 No Cluster BUS Message or No Messages from the Mechanical Instrument Cluster
  
  not sure on how to fix them though

Likely O2 sensors or other emissions control sensors.

https://www.google.com/webhp?sourceid=chrome-instant&rlz=1C1GGGE_enUS385US385&ion=1&espv=2&ie=UTF-8#q=p1687%20dodge

Code 1684 is not on the list for Chrysler cars, code 1687 is for the battery voltage dropping below 10 volts. This can occur if the voltage actually does drop below 10 or if the battery is disconnected from the computer.
It could be a wiring problem between the key switch and the main fuse box.

P1687 No Cluster Bus Message
P1693 DTC Detected In ECM Or PCM
P1694 No CCD Messages Received From ECM

Hi, do you have the 4.7 liter engine with coils on every cylinder? 351 and 355 indicate bad coils on cylinders 1 and 5. You can try moving the coils to see if the problem is the coils themselves or the wiring. If the codes change after moving the coils, replace the coils. These misfires could be the cause of the other codes.

dear friend:code p1601 stands for engine control module(ecm)transmission control unit(tcm)-serial peripheral comminication malfunction,code p1282 stands for fuel pump relay-open circuit,fuelpump relay faulty and p1687 stands for metering oil pump-high flow-circuit malfunction,(wiring metering oil pump switch metering oil pump and ecm

The code P1687 (CAN data bus, instrumentation-no signal) possible cause- wiring, instrumentation control module mechanical.

Trouble code P1121 means: Throttle Position Sensor A Inconsistent With MAF/MAP Sensor

P1687 Metering Oil Pump Stepping Motor Circuit Malfunction

p1687 is for no cluster bus message...this could mean a bad cluster....wiring to the cluster ...or a bad pcm...u should take it to a reputable repair facility for further diagnostics