P1663: FDCS Circuit Failure
The P1663 code indicates a failure in the Fuel Delivery Control System (FDCS) circuit. This system manages the fuel pump relay, fuel pressure regulator, or related wiring. A fault can cause improper fuel pressure, leading to drivability issues. Common causes include a faulty fuel pump relay, damaged wiring, or a defective engine control module (ECM).
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine cranks but does not start
- Engine stalls or runs poorly
- Reduced fuel economy
2. Most Common Causes
- Faulty fuel pump relay
- Damaged or corroded wiring/connectors in FDCS circuit
- Defective engine control module (ECM)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect FDCS wiring and connectors for damage or corrosion.
Step 3: Test fuel pump relay operation using a multimeter.
Step 4: Check fuel pressure with a gauge to verify proper delivery.
Step 5: If all else is fine, test ECM outputs and consider ECM replacement.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may stall unexpectedly or fail to start, leading to a potential accident.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for relay or wiring repairs, but ECM replacement can exceed $500.
5. Commonly Affected Makes
This is a manufacturer-specific code. The exact manufacturer is not confirmed in our current database.