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P0604

Overview

Code

P0604

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 P0604 indicates a malfunction in the ECM's internal processor

Symptoms

Check Engine Light; Engine misfire

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

Failed ECM processor; Electrical issue in ECM

Diagnostic Steps

1 Inspect ECM wiring 2 Test ECM processor

Drive Safety Notes

The ECM may not be functioning correctly

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