P0606
ECM/PCM Processor Fault
High — address promptly / stopPowertrain (engine & transmission)
System
Powertrain (engine & transmission)
Type
Generic (standardized)
Subsystem
Computer output circuit
What it means
The engine control module has detected an internal processor fault.
Symptoms
Poor running, stalling, no-start, multiple unrelated codes.
Common causes
Internal ECU/PCM failure, power/ground issues, or corrupted software.
Recommended action
Check ECU power and grounds; the module may need reflashing or replacement at a specialist.
Related codes
P0300Random/Multiple Cylinder Misfire DetectedP0301Cylinder 1 Misfire DetectedP0302Cylinder 2 Misfire DetectedP0303Cylinder 3 Misfire DetectedP0304Cylinder 4 Misfire DetectedP0420Catalyst System Efficiency Below Threshold (Bank 1)P0430Catalyst System Efficiency Below Threshold (Bank 2)P0171System Too Lean (Bank 1)P0174System Too Lean (Bank 2)P0172System Too Rich (Bank 1)P0175System Too Rich (Bank 2)P0101Mass Air Flow (MAF) Circuit Range/Performance
FAQ — P0606
What does code P0606 mean?
ECM/PCM Processor Fault. The engine control module has detected an internal processor fault.
What are the symptoms of P0606?
Poor running, stalling, no-start, multiple unrelated codes.
What causes P0606?
Internal ECU/PCM failure, power/ground issues, or corrupted software.
What should I do about P0606?
Check ECU power and grounds; the module may need reflashing or replacement at a specialist.
General reference based on the SAE J2012 standard. Exact causes for your vehicle may differ — when in doubt, consult a workshop.
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