Ford Codes List

Ford-enhanced trouble code lookup
for Ford, Lincoln and Mercury.

Repair Order

655 Ford-enhanced codes on file

Code
P1662

Injector Control Module Relay Circuit Malfunction

Category
Powertrain - Fuel/Air Metering
Severity
Check Engine Light
Applies to
F-250/F-350 Super Duty with 7.3L Power Stroke
Related
No single generic twin. See OBD Codes List

Findings, check these first

  • Failed IDM relay
  • Open relay control circuit
  • Blown IDM fuse
  • Corroded relay socket
  • PCM driver fault

Standard procedure

  1. Swap the IDM relay with a known-good unit
  2. Check the IDM fuse
  3. Test relay control voltage
  4. Inspect the socket
  5. Verify IDM powers up after repair

Code lookup

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Sources and review

Review: qualified. Read the source limits below.

  • OBDII.pro: P1662 Ford definition

    live reference page (obdii.pro)

    Supports: Ford-family meaning for P1662: IDM_EN Circuit Failure

    Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

Last updated 2026-09-06.

Report a correction for P1662. Include your vehicle, the issue and a source if you have one.

This fault is part of the Ford fuel and ignition codes guide. It covers the family and the order to check it.

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