P0249
UniversalTurbocharger/Supercharger Wastegate Solenoid B Circuit Low
Medium SeverityThe P0249 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the control circuit for the Turbocharger Wastegate Solenoid B. This typically means the wastegate, which regulates turbo boost pressure, is not functioning correctly, leading to reduced engine performance and potentially increased fuel consumption.
⚠️ Before You Begin (Safety First)
Always ensure the engine is off and cool before working on any engine components. Disconnect the battery before performing any electrical work to prevent accidental short circuits or injury. Be cautious of hot exhaust components and rotating parts.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine power or "limp mode"
- Poor acceleration
- Possible turbocharger overboost or underboost
- Increased fuel consumption
Common Causes
- Faulty Turbocharger Wastegate Solenoid B
- Open or short circuit in the wastegate solenoid control circuit
- Corroded or loose electrical connectors
- Damaged wiring harness
- Faulty Powertrain Control Module (PCM) (less common)
Frequently reported on: Ford F-150 EcoBoost (2011-2016), Volkswagen Golf GTI (2006-2014), Subaru WRX (2008-2014), Audi A4 (2009-2016), Chevrolet Cruze 1.4L Turbo (2011-2016)
Diagnostic Steps
- Visually inspect all wiring and connectors associated with the Turbocharger Wastegate Solenoid B for damage, corrosion, or loose connections.
- Check the resistance of the wastegate solenoid using a multimeter; compare to manufacturer specifications.
- Test for proper voltage supply and ground at the solenoid connector when commanded by the PCM (requires a scan tool).
- If the solenoid tests faulty, replace the Turbocharger Wastegate Solenoid B.
- Clear the code and test drive the vehicle to confirm the repair.
👨🔧 When to Call a Professional
If after checking wiring and connections, the code persists, or if you are unsure about testing electrical circuits, it is best to consult a professional mechanic. Turbocharger systems can be complex, and incorrect diagnosis might lead to further damage.
Commonly Asked Questions
What is a wastegate solenoid?
A wastegate solenoid controls the wastegate, a valve that diverts exhaust gases away from the turbocharger turbine to regulate boost pressure and prevent overboosting.
Can I drive with a P0249 code?
While you can drive with this code, your vehicle will likely have reduced power and fuel efficiency. It's recommended to address it promptly to avoid potential long-term issues or damage to the turbocharger system.
Is this an expensive repair?
The cost varies. The wastegate solenoid itself is typically not excessively expensive (under $100-$200), but diagnosis and labor can add to the cost, especially if the solenoid is difficult to access.
How can I confirm the wastegate solenoid is the problem?
You can test the solenoid's resistance with a multimeter and check for proper voltage and ground signals with a scan tool and wiring diagram. A common test involves checking for a clicking sound when voltage is applied directly.
Could a P0249 code indicate a problem with the turbocharger itself?
Not directly. P0249 points to an electrical issue with the solenoid's circuit. However, a malfunctioning solenoid can lead to improper boost control, which over time could potentially stress or damage the turbocharger if left unaddressed.