OBD
P0606
PCM Processor Fault
What it means
P0606 means PCM Processor Fault.
Check these first
- 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
What to do next
- 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
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.