Question

P0004 and P1590 codes what is the fix on my 2012 Mitsubishi Outlander?

Answer 1

P1590  TCM to ECM communication error in torque reduction request

P0004 Fuel volume regulator circuit high

The most import code you have is P1590 this is from a failed communication of the ECM to the TCM,or even a intermittent failed ECM,

Answer 2

P1590 MITSUBISHI Code - TCM To ECM Communication Error In Torque Reduction Request
Read more: https://www.autocodes.com/p1590_mitsubishi.html

P0004 Code - Fuel Volume Regulator Control Circuit High
Read more: https://www.autocodes.com/p0004.html