Turbo Wastegate Solenoid B Range/Performance
The P0248 code indicates that the Engine Control Module (ECM) has detected a performance or range issue with the turbocharger wastegate solenoid B circuit. This solenoid controls the boost pressure by regulating the vacuum or electronic signal to the wastegate actuator. When the ECM sees that the actual boost pressure does not match the desired boost, or the solenoid's electrical response is out of expected range, it sets this code. Common causes include a faulty solenoid, wiring issues, vacuum leaks, or a stuck wastegate.
1. Most Common Causes
- Faulty or stuck wastegate control solenoid 'B'
- Open or short to ground/power in the solenoid 'B' wiring
- Vacuum or pressure leak in the wastegate control hoses
- Mechanically stuck or damaged wastegate actuator
- Out-of-calibration boost pressure sensor (MAP/Boost)
- Internal PCM failure (uncommon)
2. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power or acceleration
- Turbocharger overboost or underboost
- Poor fuel economy
- Possible limp mode activation
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors to solenoid B for damage or corrosion.
Step 3: Test solenoid B resistance and operation with a multimeter and vacuum pump.
Step 4: Check for vacuum leaks in hoses to wastegate actuator.
Step 5: Verify wastegate actuator movement and linkage for binding.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as reduced performance and potential overboost can cause engine damage. Limp mode may limit speed.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the exact cause and vehicle make.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.