Internal Control Module Keep Alive Memory Error
Table of contents
- Possible Causes
- How To Fix
- Tech Notes
- Cost To Diagnose
- When is the code detected
- Possible Symptoms
- Description
P0603 Possible Causes
- 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
How do I fix code P0603?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- Start by charging the vehicle’s battery and clean the terminal, once the battery is charged and the terminals are clean and secured, erase the code. If the code comes back ON, then you may have to reprogram or replace Engine Control Module (ECM) / Powertrain Control Module (PCM)
Cost of diagnosing the P0603 code
The cost of diagnosing the P0603 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
Indicates the Engine Control Module (ECM) / Powertrain Control Module (PCM) has experienced an internal memory fault.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine may not start
P0603 Description
Battery voltage is supplied to the Engine Control Module (ECM) / Powertrain Control Module (PCM) even when the ignition switch is turned OFF for the ECM/PCM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.