What causes P1668 on a Ford?

Open communication link between ECM and IDM Corroded IDM connector Failing IDM Low system voltage Chafed link wiring

How do I fix P1668 on a Ford?

Verify IDM power and ground Inspect the IDM connector for corrosion Test link continuity between modules Check system voltage Repair wiring or replace the IDM

P1668 Engine/Injector Control Module Communication Error

Q: What does P1668 mean on a Ford?

P1668 — Engine/Injector Control Module Communication Error. Applies to F-250/F-350 Super Duty diesel.

Category: Network Communications
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty diesel

What does P1668 mean on a Ford?

P1668 — Engine/Injector Control Module Communication Error. This Ford-enhanced code applies to F-250/F-350 Super Duty diesel.

Common causes of P1668

Open communication link between ECM and IDM
Corroded IDM connector
Failing IDM
Low system voltage
Chafed link wiring

How to fix P1668

Verify IDM power and ground
Inspect the IDM connector for corrosion
Test link continuity between modules
Check system voltage
Repair wiring or replace the IDM