Skip the auto shop - Our mechanics make house calls
  1. Home
  2. Articles
  3. P0029 OBD-II Trouble Code: Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)

P0029 OBD-II Trouble Code: Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)

check engine light logo

P0029 trouble code definition

Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)

What the P0029 code means

P0029 is the OBD-II generic code indicating the engine control module (ECM) has determined that the variable valve lift solenoid for the exhaust valves for bank 2 takes too long to engage or does not engage.

What causes the P0029 code?

  • The ECM activates the exhaust valve solenoid for bank 2 and the valve lift does not shift.

  • The exhaust variable valve lift solenoid is short circuited internally.

  • The variable valve lift solenoid has an open circuit internally.

  • The wiring or connections to the exhaust valve solenoid or the ECM is shorted or open.

What are the symptoms of the P0029 code?

  • The engine can lack power if the valve lift fails in the low position.
  • The engine may run rough or stall.
  • The engine will run very erratic at idle and on acceleration.
  • The check engine will be illuminated indicating a problem.

How does a mechanic diagnose the P0029 code?

  • Visually check the electrical connections and wire harness to the bank 2 exhaust valve solenoid.

  • Clear codes and verify if the code returns.

  • Utilize the test solenoid to operate the variable valve lift is operational mechanically.

  • Test the lift solenoid for internal short or open circuit to solenoid specifications.

  • Follow the manufacturer's specific pinpoint tests for further diagnosis.

Common mistakes when diagnosing the P0029 code?

Follow these simple guidelines to prevent mistakes:

  • Verify the failure by clearing the code and seeing it the problem is still present.

  • Do not attempt any diagnosis without special tools like a test solenoid.

  • Follow any pinpoint test, step by step, to isolate the failure on the system.

  • Do not replace any parts unless directed by the pinpoint or visual testing.

How serious is the P0029 code?

  • The engine can hesitate and have a lack of power during acceleration.

  • The engine may start real hard or run too lean.

  • The engine may stall when stopping or run rough.

What repairs can fix the P0029 code?

  • Clearing the fault codes and performing a road test to try and verify the failure

  • Replacing the variable valve lift solenoid for the exhaust camshaft bank 2

  • Repairing or replacing the wiring or connection to the exhaust lift solenoid

  • Repairing the ECM connector or replacing the ECM

Additional comments for consideration regarding the P0029 code

The variable valve lift solenoid can get clogged with sludge or thick oil, and not actuate the variable valve lift mechanism. The oil needs to be kept clean and of the proper viscosity.

Need help with a P0029 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....


Related questions

Q: Code p0037: Bank 1, Sensor 2 H02S Heater Control circuit signal had low voltage for a pre-determined period of time

Hello. If your oxygen sensor is reading low then it may be possible that it needs to be replaced. If there was a blown fuse or disconnected wire then there would be no signal at all. If the oxygen sensor...

Q: Low oil comes on..trys to stall while accelerating...jerks,etc. Will not start.

Hey there: The problem you're having with your GMC Envoy stalling could be caused by all or one of the components you've mentioned in your question. A dirty fuel filter will restrict the flow of gasoline to the injectors, as...

Q: My aura shakes when it starts saying "service traction" what is it?

Hello, thank you for writing in. At this point there are a lot of possible causes for your vehicle's symptoms. To gather more information, we need to start with having the vehicle scanned for diagnostic troubleshooting codes. This can be...