P0606 – Meaning, Causes, Symptoms, & Fixes

Code P0606 Definition

The processor in the ECM/PCM has a fault

What Does P0606 Mean?

Code P0606 is triggered when there is a fault found in the processor internal to the Engine Control Module (ECM)/Powertrain Control Module (PCM). Based on your manufacturer, it will either be an ECM or PCM. In most cases, it is a faulty ECM/PCM but you should always check powers and grounds to verify there isn’t a wiring problem before replacement of the control module.

What Are The Symptoms Of Code P0606?*

  • Check Engine Light
  • Engine fans running when the ignition is on
  • Engine cranks but doesn’t start
  • Engine doesn’t crank and doesn’t start

*No noticeable adverse conditions in some cases

What Is The Cause Of Code P0606?

  • Faulty ECM/PCM
  • Faulty power to ECM/PCM
  • Faulty ground to ECM/PCM

How Serious Is Code P0606? – Severe

This trouble code can cause the vehicle not to start, but in some cases, the check engine light may be the only thing different from vehicle operation. However, this could leave you stranded and should be fixed sooner than later.

Code P0606 Common Diagnosis Mistakes

Not checking power and ground before replacing the ECM/PCM

Tools Needed to Diagnose:

  • FIXD
  • Basic Hand Tools
  • Vehicle Specific Service Manual
  • Multimeter

How To Diagnose And Repair Code P0606?

Difficulty of Diagnosis and Repair (2 out of 5)

  1. Check to see if there are any other codes along with P0606 and clear your Check Engine Light with FIXD.
  2. Check the freeze frame data in order to pinpoint the issue.
  3. Check Battery power and Ignition Power at ECM/PCM. If you don’t find power at one of these, check the fuse for that circuit and check the integrity of the circuit by performing a resistance check
  4. Check Grounds for the ECM/PCM. If you don’t find a ground where you should have a ground, perform a resistance check of the circuit to see if you have an open. Repair wiring as needed.
  5. If the ECM/PCM has all powers and grounds replace the ECM/PCM

Estimated Cost of Repair

For error code P0606, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair. 

  • ECM $1000-$1200
  • Wiring repair/replacement $100-$1000

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