P0606 PCM Processor Fault
What does P0606 mean?
P0606 — PCM Processor Fault. This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects pcm processor fault. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0606
- Failed PCM processor or internal hardware
- Corrupted PCM software
- Voltage spikes or poor power supply to the PCM
- Water or moisture intrusion into the module
- Firmware programming error
How to fix P0606
- Check PCM power, ground, and battery voltage
- Look for PCM software updates and TSBs
- Apply the latest calibration if available
- Inspect the module for moisture or corrosion damage
- Replace the PCM if the fault repeats after reprogramming