99psd p0603 code

[jaydog]

99psd pulls p0470 and p0603 found p0471 what is p0603 please help

[SCUFFY828]

if you have a programmer or chip of any kind and take it out or change something ,it will set that code ,disregard that code ,run diag for other code

[larz18]

heres what that code is. Chips will cause this one big time like scott said.

P0603 PCED Internal control module KAM Open PCM pin, disconnect B+
error faulty PCM

[mschn99]

as scott said....anytime you put a chip or programmer in one of these trucks its gonna set a p0603.....its normal for it to be there