P0033
Fix within a few daysYour engine's computer detected a problem with the electrical circuit that controls the turbocharger or supercharger bypass valve. This valve helps regulate boost pressure.
Code P0033 means your turbo/supercharger bypass valve control circuit has a high voltage issue. Common causes: Bypass valve solenoid (60%), wiring (25%). Drivability: Yes, but with reduced power. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0033?
Yes, for short trips only
Essential trips under 10 miles, avoid highways and heavy acceleration
Stop driving immediately if: Flashing CEL, loud noises from the engine bay, significant power loss making driving unsafe
Symptoms of P0033
- 1Check Engine Light is on
- 2Noticeable loss of engine power or acceleration
- 3Turbo lag (delay in power delivery when accelerating)
- 4Engine may feel sluggish
- 5Reduced fuel economy
Common Causes of P0033
Parts most likely causing this code, ranked by probability
An electrical fault or mechanical failure within the solenoid prevents it from controlling the bypass valve correctly, triggering the circuit high code.
60% of P0033 cases are fixed by replacing this part
Frayed wires, poor connections, or corrosion create resistance or an open circuit, leading the PCM to detect a high voltage condition.
25% of P0033 cases are fixed by repairing wiring or connectors
A physically stuck or damaged bypass valve can prevent proper operation, potentially causing the control circuit to report an abnormal condition.
10% of P0033 cases are fixed by replacing the bypass valve
An internal PCM fault can send incorrect signals or misinterpret sensor readings, falsely triggering the P0033 code.
5% of P0033 cases are fixed by replacing the PCM
Check These First (Before Buying Parts)
- Visually inspect the turbocharger bypass valve solenoid and its electrical connector for any visible damage, corrosion, or loose connections.
- Check all vacuum lines connected to the turbo/supercharger system for cracks, kinks, or disconnections.
How to Diagnose P0033
- 1Visually inspect the bypass valve solenoid, its wiring harness, and connector for any obvious damage, corrosion, or loose connections.
- 2Check all vacuum lines connected to the turbo/supercharger system for cracks, leaks, or disconnections.
- 3Using a multimeter, test the resistance and voltage at the bypass valve solenoid connector. Compare readings to factory specifications.
- 4If possible, use a scan tool to command the bypass valve solenoid on and off to verify its operation and listen for a click.
- 5If the solenoid tests good, remove the bypass valve and inspect it for mechanical binding or damage.
P0033 on Popular Vehicles
Ford F-150 EcoBoost
2011-2024Ford EcoBoost engines are known for issues with the turbocharger bypass valve solenoid (also called a blow-off valve solenoid). Vacuum line integrity is also critical.
70% fixed by replacing the bypass valve solenoid or repairing vacuum lines
Chevrolet Silverado
2019-2024Newer Silverado models with forced induction can experience P0033 due to electrical faults in the bypass valve control circuit, often related to the solenoid or its connector.
65% fixed by replacing the bypass valve solenoid or repairing wiring
Honda Civic Type R/Si
2016-2024Performance Honda models with turbos can trigger P0033 from a failing bypass valve solenoid or issues with the boost control system's vacuum lines.
60% fixed by replacing the bypass valve solenoid or repairing vacuum lines
Frequently Asked Questions
What does P0033 mean?
P0033 indicates that your engine's computer has detected an electrical problem in the control circuit for the turbocharger or supercharger bypass valve, specifically a high voltage condition.
Can I drive with P0033?
Yes, you can drive with P0033, but expect reduced engine power and acceleration. The engine will likely be in "limp mode" to protect the turbocharger.
Will P0033 clear itself?
No, P0033 will not clear itself. The underlying electrical or mechanical issue needs to be diagnosed and repaired before the code will clear.
How do I fix P0033 myself?
Start by inspecting the bypass valve solenoid and its wiring for damage. Test the solenoid's resistance with a multimeter. If the solenoid is faulty, replace it. Check vacuum lines for leaks.
How much does it cost to fix P0033?
DIY costs range from $50-$200 for a new bypass valve solenoid or wiring repair. Professional repair costs typically range from $150-$500, including parts and labor.
P0033 keeps coming back - why?
If P0033 returns, it means the initial repair didn't address the root cause. This often points to an intermittent wiring issue, a faulty bypass valve itself, or a rare PCM problem.
Will P0033 fail emissions/smog test?
Yes, P0033 will cause your vehicle to fail an emissions or smog test because the Check Engine Light is on, indicating an active fault in the engine management system.
What's the difference between P0033 and P0034?
P0033 indicates a "high" voltage condition in the bypass valve control circuit, while P0034 indicates a "low" voltage condition in the same circuit. Both point to an electrical issue with the solenoid or its wiring.
P0033 on Ford F-150 EcoBoost - why?
On Ford EcoBoost engines, P0033 often points to a faulty turbocharger bypass valve solenoid or issues with the vacuum lines that control it. These components can degrade over time, leading to boost control problems.
Questions to Ask Your Mechanic
Did you check the resistance and voltage at the bypass valve solenoid connector?
Good answer: Yes, the resistance was out of spec, indicating an internal fault in the solenoid. We also confirmed proper voltage supply.
What did you find when inspecting the vacuum lines for the turbo system?
Good answer: We found a cracked vacuum hose leading to the bypass valve actuator, which was causing the control issue. We replaced it.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$500
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires basic electrical diagnostic skills with a multimeter and understanding of turbocharger systems.
Cost of Waiting
Ignoring P0033 can lead to continued reduced engine performance and fuel economy. Prolonged incorrect boost pressure can put undue stress on the turbocharger, potentially shortening its lifespan and leading to a much more expensive turbo replacement ($1,000-$3,000).
While You're In There...
If you're already working on the boost system, checking or cleaning the boost sensor can prevent future related codes, as it's critical for boost regulation.
These hoses are often brittle and crack over time, causing boost control issues. Replacing them while you have access is a smart preventative measure.
Tools You'll Need
- OBD-II Scan Tool
- Multimeter
- Basic Hand Tools (sockets, wrenches)
- Wire Strippers/Crimpers (if wiring repair needed)
- Vacuum Pump (optional, for testing vacuum lines/actuator)
P0033 is a common code on turbocharged or supercharged vehicles. The repair is usually straightforward, often involving a single component replacement, and will restore your engine's full power.
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Your Next Steps
Step 1: Visually inspect the bypass valve solenoid and its wiring. Look for any obvious damage, corrosion, or loose connections. Also, check all vacuum lines for cracks or disconnections.
Step 2: If no visual issues are found, use a multimeter to test the resistance of the bypass valve solenoid and check for proper voltage at its connector. Compare your readings to your vehicle's service manual specifications.
Step 3: If the solenoid tests faulty or the wiring is damaged, you'll likely need a new turbocharger bypass valve solenoid or a wiring repair kit.