What does codes P PCU & P ECU mean?

Question

Have '01 Dodge Ram 2500 diesel, w/auto trans.  For over 3 yrs., have had same problem...engine loses rpm (100 - 400) at times.  May go months w/o any problem.  Has been in different shops (4) during that time, with no solution to the problem.  Learned this week, that if you turn the key "on - off, on - off, on"  that you can view in the odmeter...any codes.  Tried this and received Code P PCU, and then two days later received Codes P PCU & P ECU.

What do these codes mean?

How can I correct these problems, or do I need to take (it) back to the shop for repairs?

Thank you.    Bill

Answer 1

You need to get an OBDII code with an scanner. You can go to AutoZone and they'll get the code for you for free.