Turbo/Supercharger Boost Control Supply Voltage High
The P005F code indicates that the Powertrain Control Module (PCM) has detected a voltage higher than expected in the boost control solenoid supply circuit. This solenoid regulates boost pressure by controlling the vacuum or electronic actuator on the turbocharger or supercharger. A high voltage condition can be caused by a short to battery voltage, a faulty solenoid, or a wiring issue. This can lead to overboost, reduced engine performance, or limp mode.
1. Most Common Causes
- Short to battery voltage in the boost control solenoid circuit
- Faulty boost control solenoid
- Damaged wiring or connector
- Corroded terminals
- Faulty PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power or limp mode
- Overboost or underboost condition
- Poor acceleration
- Excessive black smoke from exhaust
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the boost control solenoid and wiring for damage or corrosion.
Step 3: Test the supply voltage at the solenoid connector; should be battery voltage (12V) with key on.
Step 4: Check for shorts to battery voltage in the signal circuit using a multimeter.
Step 5: Test the solenoid resistance and compare to manufacturer specs.
Step 6: If all else is normal, suspect a faulty PCM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause overboost, engine damage, or limp mode. Short trips to a repair shop are okay.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but if the solenoid needs replacement, parts can add $100-$300.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.