Avh-p5900dvd when trying to play dvd or cd comes up with...error-02-9e can you please help.

Here is the Pioneer error code table:

First Second Error
Digit Digit Description

0 No major error
1 Antenna not connected
2 Shorted antenna cable
3 RF circuit failure - PLL not synchronized
4 Undefined/Reserved
5 NVM Error
6 Defective CAP or not connected
7 Unknown DSP SW version

0 No minor error
1 CDEC Communication Error
2 SSDEC Communication Error
3 SSDEC No Response (DSP core freeze)
4 No signal/100% BER
5 Not activated
6 Not authorized

Your error indicates an SSDEC Communication Error.

You should try resetting the unit to clear this error.