Turbo/Supercharger Boost Control Circuit Low
The P0047 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the turbocharger or supercharger boost control solenoid circuit. This solenoid regulates boost pressure by controlling vacuum or pressure to the wastegate actuator. A low voltage signal suggests a short to ground, open circuit, or faulty solenoid, which can lead to reduced engine performance and potential turbocharger damage.
1. Most Common Causes
- Faulty boost control solenoid
- Short to ground in the solenoid circuit
- Open circuit or damaged wiring/connectors
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Turbocharger underboost or overboost
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0047 and check for other codes.
Step 2: Visually inspect the boost control solenoid and wiring for damage or corrosion.
Step 3: Test the solenoid resistance with a multimeter (specs vary; typically 10-30 ohms).
Step 4: Check for voltage at the solenoid connector with key on (should be battery voltage).
Step 5: If voltage is low, test the circuit for shorts or opens; repair as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as reduced boost can cause poor performance and potential turbo damage. Limp mode may activate.
How much does it cost to fix?▼
Repair costs range from $150 to $400, including parts (solenoid $50-$150) and labor ($100-$250).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.