Engine-Codes - Mercedes-Benz - P0603 Mercedes-Benz

P0603 Mercedes-Benz Code - Internal Control Module Keep Alive Memory Error

- Code Popularity: 5,816 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P0603 Mercedes-Benz?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Loose or poor battery terminal connection
  • Low battery charge
  • ECM power supply circuit is open or shorted
  • ECM Programing
  • Faulty ECM

Code Tech Notes

Start by charging the vehicles battery and clean terminal, once the battery is charged and the terminals are clean and secure, erase code. If the code comes back ON you may have to reprogram or replaced ECM/PCM

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How to Fix the DTC P0603 Mercedes-Benz?

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 pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0603 Mercedes-Benz code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

Indicates the ECM has experienced an internal memory fault.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine may not start

What Does the P0603 Mercedes-Benz Code Mean?

Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.

P0603 Mercedes-Benz Code - Internal Control Module Keep Alive Memory Error

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