Fuel Volume Regulator Control Circuit High
The P0004 code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the fuel volume regulator control circuit. This regulator controls fuel pressure by adjusting the fuel pump output. A high voltage signal suggests a short to power, open circuit, or faulty regulator, leading to improper fuel pressure regulation.
01. Most Common Causes
- Faulty fuel volume regulator
- Short to power in the regulator control circuit
- Open or shorted wiring/connectors
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Engine stalling or rough idle
- Poor fuel economy
- Hard starting or no start
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect wiring and connectors for damage, corrosion, or shorts.
Step 3: Test fuel volume regulator resistance and voltage supply with a multimeter.
Step 4: Check fuel pressure with a gauge to verify regulator operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as it can cause stalling or poor performance, potentially leading to a breakdown.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts and labor, depending on the cause.