Turbo/Supercharger Boost Control Solenoid Circuit Low Voltage
The P0047 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the 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, leading to reduced or uncontrolled boost.
01. Most Common Causes
- Faulty boost control solenoid
- Short to ground in solenoid circuit
- Open circuit in wiring or connector
- Corroded or damaged connector
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power or limp mode
- Poor acceleration
- Excessive black smoke from exhaust
- Overboost or underboost condition
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect boost control solenoid and wiring for damage or corrosion.
Step 3: Test solenoid resistance with multimeter (typically 10-20 ohms).
Step 4: Check for voltage at solenoid connector (should see battery voltage with key on).
Step 5: Perform a continuity test between PCM and solenoid connector.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a boost control issue can cause reduced power, poor fuel economy, and potential engine damage from overboost or detonation.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts (boost solenoid $50-$150) and labor (1-2 hours at $100-$150/hr).