What does P1664 mean on a Ford?

P1664. Injection Pump Control Module Faulty. Applies to Ford diesel models with electronic injection pumps.

What causes P1664 on a Ford?

Internal pump module failure Overheating from fuel starvation Voltage spike damage Wiring fault mimicking module failure Low system voltage

How do I fix P1664 on a Ford?

Verify module power and ground first Check fuel supply cools the pump adequately Rule out every external circuit fault Test with a known-good module if available Replace the module after external exclusion

Code

P1664

Injection Pump Control Module Faulty

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: Ford diesel models with electronic injection pumps
Related: No single generic twin. See OBD Codes List

Findings, check these first

Internal pump module failure
Overheating from fuel starvation
Voltage spike damage
Wiring fault mimicking module failure
Low system voltage

Standard procedure

Verify module power and ground first
Check fuel supply cools the pump adequately
Rule out every external circuit fault
Test with a known-good module if available
Replace the module after external exclusion

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

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Last updated 2026-09-06.

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