P005E: Turbo/Supercharger Boost Control Supply Voltage Circuit 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. A low voltage reading 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 'B' with internal short circuit
- Supply circuit wiring shorted to ground
- Corroded electrical connections or loose terminals in the harness
- Blown fuse or relay for the boost system power supply
- Internal PCM failure
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or turbo lag
- Overboost or underboost condition
- Possible abnormal turbo noise
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the boost control solenoid connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the solenoid's resistance with a multimeter (typically 20-40 ohms).
Step 4: Check for battery voltage at the solenoid connector with key on engine off.
Step 5: If voltage is low, trace circuit back to PCM, checking fuses and relays.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a low voltage boost control circuit can cause erratic boost levels, potentially damaging the turbocharger or engine. Limp mode may limit speed, making highway driving unsafe.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts and labor. A new boost control solenoid costs $20-$60, and labor is about $30-$90. Wiring repairs may add to the cost.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.