AutoCodes – Generic – P1663

P1663 Code - Fuel Demand Command Signal Circuit Malfunction

Quick Answer

The P1663 code indicates that the Powertrain Control Module (PCM) has detected a failure on the Fuel Delivery Command Signal (FDCS) line. Common causes include Fuel Demand Command Signal open circuit, Faulty Injector Driver Module (IDM), Injector Driver Module (IDM) harness is open or shorted. 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 Fuel Demand Command Signal open circuit, Faulty Injector Driver Module (IDM), Injector Driver Module (IDM) harness is open or shorted.
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.

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Code Popularity 31,476

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1663 Description

The P1663 code indicates that the Powertrain Control Module (PCM) has detected a failure on the Fuel Delivery Command Signal (FDCS) line.

OBDII Code P1663 - Fuel Demand Command Signal Circuit Malfunction - AutoCodes.com — P1663 Code - Fuel Demand Command Signal Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1663?

Fuel Demand Command Signal open circuit
Faulty Injector Driver Module (IDM)
Injector Driver Module (IDM) harness is open or shorted
Injector Driver Module (IDM) circuit poor electrical connection

How to Fix the DTC P1663?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1663 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1663 code?

Need more information on how to fix the P1663 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1663 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1663 Audi — Injector Activation Short To Positive
P1663 Buick — Change Oil Lamp Control Circuit Conditions
P1663 Cadillac — Change Oil Lamp Control Circuit Conditions
P1663 Chevrolet — Change Oil Lamp Control Circuit Conditions
P1663 Ford — Fuel Demand Command Signal Circuit Malfunction
P1663 GMC — Change Oil Lamp Control Circuit Conditions
P1663 Lexus — Oil Control Valve Right Bank Malfunction
P1663 Saab — Turbocharger Wastegate Regulating Valve Short To Positive
P1663 Toyota — Oil Control Valve Right Bank Malfunction
P1663 Volkswagen — Injector Activation Short To Positive

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.