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P0603

Overview

Code

P0603

Code Type

P

Code Class

P0

System

Engine

Severity Level

High

Emissions Related

false

Drivability Impact

Major

Diagnostic Protocol

OBD2

Freeze Frame Useful

true

Code Definition

Diagnostic trouble code P0603 indicates an EEPROM malfunction in the ECM

Symptoms

Check Engine Light; Poor engine performance

Overview applies to this diagnostic code.

Affected Systems

On This Page

  • Code Definition

  • Symptoms

  • Affected Systems

  • Possible Causes

  • Diagnostic Steps

  • Drive Safety Notes​

More Resources

Engine Control Module (ECM)

Possible Causes

Corrupt EEPROM data; Faulty ECM

Diagnostic Steps

1 Inspect ECM EEPROM 2 Replace ECM if necessary

Drive Safety Notes

Engine performance may degrade

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