Crank no start 99 4.6 . Gets fuel, obd read p0606 not sure to replace pcm


New Member
Feb 2, 2020
Carson City Nevada
1999 gt 4.6 crank no start has fuel and fuel pressure. Obd scan tool read p0606 which is pcm failure not sure if i should replace pcm. Have taken the car to a mechanic before and they had the keys remade it ran for a couple years after that few months back i went to fill up at the gas station and it would not start..need help for sure im at a loss cant find answers anywhere
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SN Certified Technician
Aug 14, 2009
Houston Texas
Don't see many DTC codes that come straight out and say "replace PCM". Here's some information that may help if looking for a "junk yard" PCM.

ForScan ODB2 scanner w ELM327 USB

If this were my car I would double check:
  • power(s) and ground
  • look for water damage
  • look for rodent activity
  • inspect the PCM printed circuit board for evidence of over heating or water intrusion.

P0606 - Powertrain Control Module Internal Communication error

P0606 indicates register readback (PCM internal Communications) error.

  • Damaged PCM