P0603 CHEVROLET - Control Module Long Term Memory Reset
- Loose or poor battery terminal connection
- Low battery charge
- Engine Control Module (ECM) / Powertrain Control Module (PCM) power supply circuit is open or shorted
- ECM/PCM Programing
- Faulty ECM/PCM
When is the code detected?
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine may not start
P0603 Chevrolet Description
The Engine Control Module (ECM) / Powertrain Control Module (PCM) continuously monitors its own internal memory status, internal circuits, and output signals transmitted to the throttle actuator. This self-check insures that the ECM/PCM is functioning properly. If any malfunction is detected, the will ECM/PCM will set the code and illuminate the engine light.