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P1663: Fuel Demand Command Signal Circuit Malfunction

FORD LINCOLN MERCURY OTHER LEXUS BUICK CADILLAC CHEVY
Severity
Medium
System
Manufacturer-Specific Powertrain

What Does P1663 Mean?

P1663 is a manufacturer-specific diagnostic trouble code: Fuel Demand Command Signal Circuit Malfunction. This code applies to FORD, LINCOLN, MERCURY, OTHER, LEXUS vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1663

Common Causes

Frequently Asked Questions

What does P1663 mean?
P1663 indicates: Fuel Demand Command Signal Circuit Malfunction. The vehicle's computer has detected that the Fuel Demand Command Signal is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P1663?
You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1663 for extended periods may cause additional problems.
How much does it cost to fix P1663?
Repair costs for P1663 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

  • 🔧 Inspect and repair Fuel Demand Command Signal wiring and connectors
  • 🔧 Replace faulty Fuel Demand Command Signal
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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