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Engine-Codes – Generic – P1663

P1663 Code - Fuel Demand Command Signal Circuit Malfunction

Quick Answer

The P1663 code indicates a malfunction in the fuel demand command signal circuit. Common causes include Faulty fuel demand command sensor, Wiring issues or loose connections in the signal circuit, ECM malfunction. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1663 indicates Fuel Demand Command Signal Circuit Malfunction.
Common causes
Common causes include Faulty fuel demand command sensor, Wiring issues or loose connections in the signal circuit, ECM malfunction.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 25, 2024
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Code P1663 Description

The P1663 code indicates a malfunction in the fuel demand command signal circuit. This circuit is responsible for transmitting the signal from the vehicle's engine control module (ECM) to the fuel system, instructing it on how much fuel to deliver to the engine. When this signal is compromised, it can lead to issues with fuel delivery, potentially causing engine misfires, poor performance, decreased fuel efficiency, and even stalling.

OBDII Code P1663 - Fuel Demand Command Signal Circuit Malfunction
P1663 Code - Fuel Demand Command Signal Circuit Malfunction

Common Causes of P1663

  1. Faulty fuel demand command sensor
  2. Wiring issues or loose connections in the signal circuit
  3. ECM malfunction
  4. Corrosion or damage to the connectors in the circuit
  5. Electrical interference or short circuits

Symptoms of P1663

  1. Engine misfires or hesitation during acceleration
  2. Decreased fuel efficiency
  3. Engine stalling
  4. Rough idling
  5. Check Engine Light illuminated

How to Fix P1663

  1. Use a diagnostic scanner to retrieve the trouble codes and pinpoint the issue.
  2. Inspect the wiring and connectors in the fuel demand command signal circuit for any damage or corrosion.
  3. Test the fuel demand command sensor for proper operation and replace if necessary.
  4. Clear the trouble codes and reset the ECM.
  5. Test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1663

The typical repair costs for addressing a P1663 code can range from $100 to $300, depending on the specific cause of the issue and the cost of parts. Additional costs may apply if further diagnostics or repairs are needed. It's important to note that labor rates and diagnosis fees can vary, so it's advisable to consult with a trusted auto repair shop for a more accurate estimate.

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Code P1663 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1663 Code

1. What are the common symptoms of an OBDII code P1663 (Fuel Demand Command Signal Circuit Malfunction)?

- Common symptoms include poor engine performance, rough idling, stalling, and decreased fuel efficiency.

2. What are the possible causes of the P1663 code?

- The code may be triggered by issues such as a faulty fuel pump, damaged wiring in the fuel system, or a malfunctioning fuel pressure regulator.

3. How can I diagnose a Fuel Demand Command Signal Circuit Malfunction?

- Diagnosis typically involves using an OBDII scanner to read the code, inspecting the fuel system components for damage, and testing the fuel pump and related circuits.

4. Can driving with a P1663 code be dangerous?

- While it may not pose an immediate danger, driving with this code can lead to engine performance issues and potential long-term damage if left unresolved.

5. How can I repair a Fuel Demand Command Signal Circuit Malfunction?

- Repair options may include replacing the fuel pump, repairing damaged wiring, or addressing issues with the fuel pressure regulator based on the specific cause of the code.

6. Is it safe to continue driving my vehicle with the P1663 code?

- It is not recommended to drive the vehicle extensively with this code active, as it can lead to decreased performance and potential fuel system issues.

7. Can a DIY enthusiast fix the P1663 code?

- Depending on the underlying issue, DIY enthusiasts with automotive knowledge may be able to address the problem by following repair guides and using the necessary tools.

8. How much does it typically cost to repair a Fuel Demand Command Signal Circuit Malfunction?

- Repair costs for this code can vary widely depending on the cause of the issue, but it may range from a few hundred to over a thousand dollars when factoring in parts and labor.

9. What happens if I ignore the P1663 code for an extended period?

- Ignoring the code for a prolonged period can lead to worsening engine performance, potential fuel system damage, and increased risk of other related issues developing.

10. How long does it take to repair a Fuel Demand Command Signal Circuit Malfunction?

- The repair time can vary based on the specific cause and complexity of the issue, but it may take anywhere from a few hours to a full day for a skilled mechanic to diagnose and fix the problem.

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