Severity: High
Can damage expensive parts or affect drivability. Limit driving and book promptly.
What P0606 means
The control module has detected an internal processor fault. Rule out power and ground problems before replacing a module.
Symptoms
- Stalling
- No start
- Various warning lights
Common causes
Most likely first
- 1Poor module power or ground
- 2Low system voltage during cranking
- 3Failed module
- 4Software issue (check for updates)
How we diagnose it
- Check module powers and grounds under load
- Check for factory reprogramming bulletins
Every vehicle sets codes under its own conditions. We check the factory diagnostic steps and service bulletins for your VIN, so the repair targets the actual cause.