Possible causes
– Powertrain Control Module (PCM) not programed
– PCM program
– Faulty PCM
– Wrong PCM
– PCM program
– Faulty PCM
– Wrong PCM
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0602 CADILLAC Description
This diagnostic trouble code (DTC) indicates that the Powertrain Control Module (PCM) internal EEPROM is not flashed with any vehicle software. If you install a service PCM and do not flash the EEPROM, the engine will not run. This DTC indicates that an un-flashed PCM causes the engine cranks but will not run situation.
CADILLAC Technical Service Bulletins for P0602 code
1999 CADILLAC CATERA POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM, PCM)