05-10-04, 02:55 PM
On my 94 Eldorado, the diagnostic code readout shows "PCM?". Does anyone knows what this means. I'm guessing it is not communicating with the main computer but I have not seen this on any diagnostic chart. Would appreciate any help.
05-10-04, 03:43 PM
Perfectly normal. It is just the system prompting you with PCM?....i.e...do you want to go into the PCM mode next....answer yes by pressing the HI button or NO by pressing the LO button. The onboard diagnostics is a menu driven system so the PCM? is the next selection on the menu....answer NO to see the other items.