P1663: FDCS Circuit Failure
The P1663 code indicates a failure in the Fuel Delivery Control System (FDCS) circuit. This system monitors and controls fuel delivery to the engine. A fault in this circuit can cause improper fuel pressure or flow, leading to drivability issues. Common causes include a faulty fuel pump control module, wiring issues, or a defective fuel pressure sensor.
01. Most Common Causes
- Faulty fuel pump control module
- Open or shorted wiring in FDCS circuit
- Defective fuel pressure sensor
- Corroded or loose electrical connectors
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine hesitation or stalling
- Poor fuel economy
- Hard starting or no start condition
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect FDCS wiring and connectors for damage or corrosion.
Step 3: Test fuel pump control module and fuel pressure sensor with a multimeter.
Step 4: Check fuel pressure with a gauge to verify proper operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause stalling or poor engine performance, potentially leading to unsafe driving conditions.
How much does it cost to fix?▼
The cost to fix P1663 typically ranges from $50 to $150 for diagnostic and minor repairs, but could be higher if the fuel pump control module needs replacement.