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 for the turbocharger wastegate solenoid B. This solenoid controls the wastegate actuator, which regulates boost pressure by diverting exhaust gases away from the turbine. A low voltage signal suggests a fault in the solenoid, wiring, or connector, potentially leading to overboost or underboost conditions.
01. Most Common Causes
- Faulty turbocharger wastegate solenoid B
- Damaged or corroded wiring/connector in solenoid circuit
- Blown fuse or relay for solenoid circuit
- ECM internal fault
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: Use a scan tool to confirm P0249 and check for other related codes.
Step 2: Visually inspect the wastegate solenoid B connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the solenoid resistance with a multimeter; compare to manufacturer specs (typically 15-30 ohms).
Step 4: Check for voltage at the solenoid connector with the ignition on; should be battery voltage (12V).
Step 5: If voltage is low, trace circuit back to ECM and check fuses/relays.
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 it can cause reduced power, poor fuel economy, and potential engine damage from overboost.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on whether the solenoid or wiring needs replacement.