Frequently Asked Question

Honda ECU Label Decode
Last Updated 2 years ago

You can find out a lot from reading the label on an OBD1 ECU. This applies mainly to the Civic ECU

37820-ABC-XYZ

DigitsMeaning
ABCEngine ECU designed for
XThe market of ECU - see chart below
Y0: 5-speed, 5: Auto
Zeven number: "11F0" board, odd number: "1720" board
CodeMarket
AxxUSDM 49-state
LxxUSDM Cali Emissions
xxxJDM
JxxJDM
9xxJDM (auto)
GxxEDM
QxxOz DM
CxxCanadian
Nxxusually, factory reprogrammed, no particular market

Example:

37820-P28-A52

  • P28 = SOHC Vtec D16Z6
  • A = US, 49 state
  • 5 = Auto
  • 2 = "11F0" board

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