2009, what engine there, and transmission?>
gas engine, or diesel and what size engine,?
in what country? must i guess, that too?
P means power train.
1xxx are factory codes, 0xxx are fed standard codes.
so that means, only jeep books are accurate here.
where did you see that, (in the cluster) ???????????
or someone scan tool> or someone yelled it over shoulders, and said it wrong./????????????
was it really? and 8? or b? (kinda matters, no?) accurate inputs.
P1618-SENSOR REFERENCE VOLTAGE 1 CIRCUIT ERRATIC
P161b ( see how easy it is to get the code wrong)?
rumor has it as
P161B: Battery disconnect/TCM internal.
clean the battery terminals,
or battery weak, voltage not 12.6vdc rested
or alternator dead, and not charging battery.
to find it, login to Mitchell.
and see all codes
or you disconnected the battery while key was on?
or failed to clear all DTC first
then see if the code comes bacK>?