P0029
UniversalExhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)
The engine computer has detected that the exhaust valve control solenoid circuit or its response on Bank 2 is outside the expected range or performance. The solenoid helps control exhaust valve timing or operation, commonly by directing engine oil through a valve-control system. This code identifies a detected condition; it does not prove the solenoid itself has failed. Depending on the vehicle and fault, engine performance, fuel use, or emissions may be affected, or there may be no noticeable symptoms.
⚠️ Before You Begin (Safety First)
If the engine runs roughly, loses power, stalls, overheats, or the oil-pressure warning appears, stop driving when it is safe and have the vehicle assessed. If the check-engine light is steady and the vehicle runs normally, arrange diagnosis soon and follow the vehicle owner's manual. Do not work around hot or moving engine parts.
Common Symptoms
- The check-engine light may be on, with no obvious change in how the vehicle drives.
- Rough running or uneven idle may occur if exhaust valve control is not responding as expected.
- Reduced power or sluggish acceleration may occur if valve operation is affected.
- Fuel economy or emissions may worsen if valve timing or operation is not being controlled correctly.
- The engine may hesitate or be difficult to start in some cases, depending on the vehicle and the underlying fault.
Common Causes
- A fault in the Bank 2 exhaust valve control solenoid or its ability to respond correctly.
- Damaged, loose, corroded, or oil-contaminated wiring or connectors in the solenoid circuit.
- An engine oil level or condition problem that interferes with an oil-operated valve-control system.
- A restriction or other fault in the oil passages or valve-control mechanism.
- A problem with the circuit's power, ground, or control signal, or with the engine computer; these require testing before components are replaced.
Diagnostic Steps
- Check the owner's manual for the meaning of Bank 2 on this vehicle; bank identification depends on the engine layout.
- With the engine off and cool, check the engine oil level and condition using the owner's manual procedure. Correct an obvious low level with the specified oil, and investigate any leaks or recurring loss.
- Visually inspect the accessible solenoid wiring and connector for looseness, damaged insulation, corrosion, or oil contamination. Do not disconnect or probe connectors while the engine is running.
- If you have a suitable scan tool, record the code and any related codes before clearing anything; related faults can help distinguish a circuit issue from a valve-control response problem.
- If the code returns, or the wiring and oil checks do not reveal an obvious issue, arrange testing with vehicle-specific service information rather than replacing the solenoid based on the code alone.
When to Call a Professional
Confirm the code and check for related codes, then compare scan data for commanded and actual exhaust valve-control operation on Bank 2 where the vehicle supports it. Inspect the solenoid connector and wiring, and verify engine oil level and condition. Test the circuit and control response using model-, year-, and engine-specific service information before deciding whether the solenoid, wiring, oil-control system, or another component needs repair.
Compare component listings
Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.
Commonly Asked Questions
Does P0029 prove the Bank 2 exhaust valve control solenoid is bad?
No. The code reports a range or performance condition in the solenoid circuit or its response. Wiring, connectors, oil supply, the valve-control mechanism, or control signals may also be involved.
What does Bank 2 mean?
Bank 2 is the engine bank identified as Bank 2 by the vehicle's engine layout. Its location varies, so use model-, year-, and engine-specific information rather than assuming a side of the vehicle.
Can I drive with P0029?
It depends on how the engine is running. If the vehicle behaves normally and the check-engine light is steady, arrange diagnosis soon. Stop driving when safe if there is severe rough running, stalling, overheating, major power loss, or an oil-pressure warning.
Could engine oil cause this code?
It may contribute if the valve-control system depends on engine oil flow. Check the level and condition, but do not assume an oil issue or a failed solenoid without further diagnosis.
What should be checked before replacing parts?
Confirm the code, review related codes and available scan data, inspect the Bank 2 solenoid connector and wiring, and check oil level and condition. Further circuit and valve-control tests depend on the specific vehicle.
Related Diagnostic Video
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.