Turbocharger Wastegate Solenoid B Low Voltage
The P0249 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the circuit of the turbocharger wastegate solenoid B. This solenoid controls the wastegate actuator, which regulates boost pressure. A low voltage signal suggests a problem with the solenoid itself, its wiring, or the ECM's ability to supply proper voltage. This can lead to reduced engine performance and potential turbocharger damage if not addressed.
1. Most Common Causes
- Faulty turbocharger wastegate solenoid B
- Open or shorted wiring in the solenoid circuit
- Poor electrical connection at the solenoid or ECM
- Failed ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Possible turbocharger overboost or underboost
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve the code and freeze frame data.
Step 2: Visually inspect the wastegate solenoid B and its wiring for damage or corrosion.
Step 3: Test the solenoid resistance with a multimeter (typically 15-30 ohms).
Step 4: Check for voltage at the solenoid connector with the engine running (should be near battery voltage).
Step 5: If voltage is low, check the circuit for shorts or opens; if solenoid is faulty, replace it.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential turbo damage. Short trips to a repair shop are okay.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.