I feel like a dummy. It turned out the battery was bad only 2.7v.
The replacement I first used was previously used.
Got a new one and all is well.
Found that the unit must have a battery that is fresh. A slightly low battery will not work.
I even put the "low" battery in another unit and it worked.
Was this helpful?
Yes
No
Popular Solutions for Pioneer DEH-P4000UB CD Player
I got a Pioneer DEH-P4000UB cd player with usb input for my car. I purchased a 16GB Scandisk Cruzer...
(More)
I got a Pioneer DEH-P4000UB cd player with usb input for my car. I purchased a 16GB Scandisk Cruzer 2.0 flash drive (like taran_2005), but it will not recognize the usb. It gives me "Error 23" which the manual claims is a CD error. I formatted the usb as FAT32, copied the music back onto it and it still is not recognized. What now?