Turbo/Super Charger Bypass Valve Control Circuit High
The P0033 code means the vehicle's onboard diagnostic system has detected: Turbo/Super Charger Bypass Valve Control Circuit High. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $600 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Common Symptoms
- Check Engine Light on
- Loss of turbo boost pressure
- Reduced engine power and acceleration
- Turbo may produce unusual whining noise
Probable Causes (Ranked by Likelihood)
- Faulty turbo bypass valve solenoid Very High
- Short circuit in bypass valve control wiring High
- Corroded connector at bypass valve Moderate
- ECM/PCM failure Low
Step-by-Step Diagnostic Procedure
-
Confirm P0033 with scan tool and review freeze frame data
-
Inspect wiring and connector to the turbo bypass valve solenoid
-
Measure voltage at the bypass valve solenoid connector with key on
-
Test bypass valve solenoid resistance and compare to specifications
Frequently Asked Questions
What does P0033 mean?
P0033 means the turbo or supercharger bypass valve control circuit has a high voltage condition, usually pointing to a wiring short or faulty solenoid.
Can I drive with P0033?
You can drive short distances, but you will likely experience reduced power due to improper boost control. Avoid heavy acceleration until repaired.
How is P0033 fixed?
The most common fix is replacing the bypass valve solenoid. In some cases, repairing a short in the wiring harness resolves the issue.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Share carcodefinder.com with a friend who needs to decode their check engine light.