Turbo/Supercharger Boost Control Supply Voltage Low
The P005E code indicates that the powertrain control module (PCM) has detected a low voltage condition in the boost control solenoid supply circuit. This solenoid regulates boost pressure by controlling vacuum or wastegate operation. Low voltage can prevent proper solenoid operation, leading to reduced boost, limp mode, or check engine light.
01. Most Common Causes
- Faulty boost control solenoid
- Open or shorted wiring in solenoid circuit
- Blown fuse or relay for boost control
- Corroded or loose connector at solenoid
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or turbo lag
- Overboost or underboost condition
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect boost control solenoid connector for corrosion or damage.
Step 3: Test solenoid supply voltage with multimeter (should be battery voltage with key on).
Step 4: Check continuity and resistance of wiring between PCM and solenoid.
Step 5: Test solenoid resistance and actuation with a scan tool or power/ground.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as low boost can cause poor performance and potential engine damage if overboost occurs. Limp mode may limit speed.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts (solenoid, wiring repair) plus diagnostic time. Labor can add $100-$200 depending on shop rates.