P0606: ECM / PCM processor fault
Stop driving. Get it towed or fixed first.
Can I drive with P0606?
No, stop driving safely as soon as possible. The main engine computer microprocessor has crashed or failed; car may stall at any time.
What does P0606 mean?
P0606 stands for ECM/PCM Processor Fault.
Symptoms you may notice
- Check engine light steadily illuminated
- Slight hesitation or change in throttle response
- Possible increase in fuel consumption
How much does it cost to fix?
Repair costs for code P0606 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Internal processor failure inside engine computer
- Severe voltage drop or electrical surge
- Corroded PCM power and ground pins
- Damaged harness wire shorting to high voltage
What to do next
- Pull over in a safe area; sudden engine cut-off is very likely.
- Check main engine bay ground cables and battery terminals.
- Tow the vehicle for PCM diagnostic testing and module replacement.
Last updated: October 2026
Related codes
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code P0606 indicates that the central processing unit of the powertrain computer has encountered a fatal internal diagnostic failure. Because the processor controls throttle, fuel delivery, and ignition, continuing to drive risks sudden loss of power on freeways. Towing the vehicle is strongly advised.