P0606: ECM/PCM Processor Fault
The engine control module itself has reported an internal fault. Sometimes it's a bad ground or battery voltage issue rather than the computer itself.
Can I keep driving?
It depends. If the car runs normally, short trips are possible, but a failing control module can cause stalling, so avoid highways until it is checked.
Symptoms you might notice
- Check engine light, often with several unrelated codes
- Stalling or a no-start
- Shifting or other systems acting strangely
What to check first
- Test the battery and charging system. Low or unstable voltage can make a healthy computer report a fault.
- Inspect the battery terminals and the engine and body ground straps for corrosion or looseness.
- Check whether a software update or reflash exists for your vehicle, which a dealer can tell you.
- Treat replacing the computer as the last step, since it often needs programming to the vehicle.
Most common causes
- Poor ECM ground connection
- Battery or charging system voltage out of spec
- Failed engine control module
Check it against your exact vehicle
A code means the same thing on every car, but where the parts are and what to check first depends on your year, make, model and engine. Tell CaliperAI what you are seeing and it will help narrow down the likely causes for your vehicle.
Not sure this is your problem? Browse common car problems by symptom.
General information about this code, not a diagnosis of your specific vehicle. Safety-critical work such as brakes, fuel and airbags is best left to a qualified mechanic.