P0600

Medium Severity

Serial Communication Link

Electrical System

What Does P0600 Mean?

Communication error within the ECM or between the ECM and scan tool.

Common Fix

Repair ground connection or replace ECM

Estimated Cost (DIY)

$0 - $500

Symptoms

  • ⚠️Check engine light
  • ⚠️Scan tool communication issues
  • ⚠️Multiple random codes

Related Symptoms

Common Causes

ECM internal faultpossible
Poor ground connectionlikely
Damaged OBD2 portpossible

How to Diagnose P0600

  1. 1Check all ECM ground connections
  2. 2Inspect OBD2 port for damage
  3. 3Try different scan tool
  4. 4Check ECM connector

OEM Diagnostic Flowchart

Scroll to load technician if/then branches.

Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0600.

Frequently Asked Questions

Does P0600 mean the computer is bad?
Not necessarily — check grounds and connections first. A corroded ground is a much more common cause than a failed ECM.
Is ECM replacement expensive?
ECMs cost $200-$800 and may need programming. Always rule out wiring issues first.

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