P0247
Fix within a few daysThe engine computer detects a higher than expected voltage signal from the Turbocharger/Supercharger Wastegate Solenoid 'B' control circuit.
Code P0247 means your engine computer sees a high voltage signal from the wastegate solenoid 'B'. Common causes: Faulty wastegate solenoid (65%), wiring issues (30%). Drivability: Limit driving, fix within a few days. Repair cost: $100-$350 DIY, $200-$700 professional.
Can I Drive With P0247?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration. Monitor engine performance closely.
Stop driving immediately if: Flashing CEL, loud engine noises, burning smell, significant power loss, or engine going into 'limp mode' frequently.
Symptoms of P0247
- 1Check Engine Light is on
- 2Reduced engine power or 'limp mode'
- 3Engine hesitation or poor acceleration
- 4Unusual noises from the turbocharger area (whining, hissing)
- 5Engine may feel sluggish or unresponsive
Common Causes of P0247
Parts most likely causing this code, ranked by probability
The solenoid itself has an internal electrical fault, causing it to send a higher than expected voltage signal to the engine computer.
65% of P0247 cases are fixed by replacing this part
Damaged wiring or a short to a power source in the solenoid's circuit causes the engine computer to detect an abnormally high voltage.
30% of P0247 cases are fixed by repairing wiring or connectors
A rare internal malfunction within the engine computer incorrectly registers a high voltage signal from the wastegate solenoid circuit.
5% of P0247 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Visually inspect the wastegate solenoid 'B' and its electrical connector for any obvious damage, corrosion, or loose connections.
- Check the wiring harness leading to the wastegate solenoid 'B' for any signs of chafing, cuts, or rodent damage.
How to Diagnose P0247
- 1Visually inspect the wastegate solenoid 'B' and its electrical connector for damage, corrosion, or loose connections.
- 2Check the wiring harness leading to the wastegate solenoid 'B' for any signs of chafing, cuts, or shorts to power.
- 3Using a multimeter, test the voltage at the wastegate solenoid 'B' connector to verify the signal from the PCM and check for shorts to voltage.
- 4Test the resistance of the wastegate solenoid 'B' itself to ensure it falls within manufacturer specifications.
- 5If possible, use a scan tool to command the wastegate solenoid 'B' on and off and monitor its electrical feedback.
P0247 on Popular Vehicles
Ford F-150
2011-2024EcoBoost engines are prone to wastegate solenoid failures due to heat exposure. Wiring harness damage from rodents or chafing is also a common culprit.
80% fixed by replacing solenoid or repairing wiring
Chevrolet Silverado
2019-2024With the introduction of turbocharged engines, wastegate solenoid issues are becoming more common. Check for loose connectors or corrosion first.
75% fixed by replacing solenoid or repairing wiring
Subaru Forester/Outback
2009-2024Subaru's turbo models can experience P0247 due to solenoid failure or vacuum line issues affecting solenoid operation. Always inspect vacuum lines if applicable.
70% fixed by replacing solenoid or repairing wiring
Frequently Asked Questions
What does P0247 mean?
P0247 indicates that your vehicle's engine computer has detected an electrical problem with the 'B' wastegate solenoid circuit, specifically a higher than expected voltage signal. This solenoid controls the turbocharger or supercharger's boost pressure.
Can I drive with P0247?
Limit driving, fix within a few days. Driving with P0247 can lead to uncontrolled boost pressure, which can cause severe engine damage if it results in overboost. You will also experience reduced power and poor fuel economy.
Will P0247 clear itself?
No, P0247 will not clear itself. The underlying electrical fault or component failure needs to be diagnosed and repaired. The Check Engine Light will remain on until the issue is resolved and the code is cleared, either by the PCM after several drive cycles or with a scan tool.
How do I fix P0247 myself?
Start by visually inspecting the wastegate solenoid 'B' and its wiring for any obvious damage. If the wiring looks good, test the solenoid's resistance with a multimeter. If it's out of specification, replace the wastegate solenoid. If the solenoid tests good, you will need to trace the wiring for a short to voltage.
How much does it cost to fix P0247?
The cost to fix P0247 yourself is typically $100-$350 for a new wastegate solenoid. Professional repair at a shop will cost $200-$700, including parts and labor, depending on your vehicle and shop rates.
P0247 keeps coming back - why?
If P0247 keeps returning, it often means the initial diagnosis missed the true cause. This could be due to an intermittent wiring short that wasn't found, a faulty replacement solenoid, or a rare issue with the engine computer itself. Thoroughly re-inspect the entire circuit.
Will P0247 fail emissions/smog test?
Yes, P0247 will cause your vehicle to fail an emissions or smog test. A Check Engine Light being on is an automatic failure in most jurisdictions, and issues with boost control directly impact engine performance and emissions.
What's the difference between P0247 and P0246?
P0247 indicates a 'high' voltage signal in the wastegate solenoid 'B' circuit, meaning the PCM sees too much voltage. P0246 indicates a 'low' voltage signal, meaning the PCM sees too little voltage. Both point to an electrical issue with the solenoid or its circuit, but the specific fault (short to power vs. open circuit/short to ground) differs.
P0247 on Ford F-150?
On Ford F-150s, especially those with EcoBoost engines, P0247 commonly points to a faulty turbocharger wastegate solenoid. These solenoids can fail over time due to heat and vibration. Always check the wiring harness for rodent damage or chafing first, as this is also a known issue.
Questions to Ask Your Mechanic
Did you test the voltage and resistance of the wastegate solenoid 'B' circuit?
Good answer: Yes, I confirmed the solenoid's resistance is out of spec, or I found a short to power in the wiring leading to the solenoid.
Have you checked for any wiring shorts or open circuits to the wastegate solenoid 'B'?
Good answer: Yes, I performed a continuity test and checked for shorts to ground and power on the entire circuit, and found a damaged wire near the turbo.
Repair Cost Estimate
DIY Repair
Parts only
$100-$350
Shop Repair
Parts + labor
$200-$700
Save $100-$350 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires a multimeter and basic electrical diagnostic skills, along with the ability to locate and access the wastegate solenoid.
Cost of Waiting
Ignoring P0247 can lead to severe engine damage from uncontrolled boost pressure (overboost), potentially requiring a costly turbocharger replacement ($1,000-$3,000) or even engine repair. A $100-$350 solenoid fix now prevents a multi-thousand dollar bill later.
While You're In There...
If your wastegate is vacuum-actuated, old or cracked vacuum lines can affect solenoid operation and are easy to replace while accessing the solenoid.
The boost sensor works in conjunction with the wastegate solenoid to regulate boost pressure. If you're already diagnosing boost issues, checking or replacing this sensor can prevent future related codes.
Tools You'll Need
- OBD-II scan tool
- Multimeter
- Socket set
- Wrench set
- Wire strippers/crimpers (if wiring repair is needed)
- Electrical tape or heat shrink tubing
P0247 is a common turbocharger system code. Most repairs involve replacing a faulty solenoid or repairing a damaged wire, and your engine's performance will return to normal afterward.
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Your Next Steps
Step 1: Visually inspect the wastegate solenoid 'B' and its wiring harness for any obvious damage, corrosion, or loose connections. Pay close attention to areas where wires might rub against engine components.
Step 2: If the visual inspection doesn't reveal the problem, use a multimeter to test the resistance of the wastegate solenoid 'B'. Compare your reading to the manufacturer's specifications. If it's out of spec, replace the solenoid.
Step 3: If the solenoid tests good, use the multimeter to check for a short to voltage in the wiring harness leading to the solenoid. This will require a wiring diagram for your specific vehicle. Parts you'll likely need: a new wastegate solenoid if it tests bad, or wiring repair supplies if a short is found.