P0028
UniversalIntake Valve Control Solenoid Circuit Range/Performance (Bank 2)
Medium SeverityThis code indicates an issue with the variable valve timing (VVT) system specifically related to the intake valve control solenoid on Bank 2. This typically means the engine's computer is not seeing the expected electrical signals or performance from this component, which can affect engine performance and fuel efficiency.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is safely parked on a level surface with the parking brake engaged before performing any work. Disconnect the negative battery terminal before working on electrical components to prevent accidental shorts or injury. Allow the engine to cool down completely before touching any engine components to avoid burns.
Common Symptoms
- Check Engine Light illuminated
- Reduced engine performance or power
- Poor fuel economy
- Rough idle
- Engine may run erratically
Common Causes
- Faulty intake VVT solenoid (Bank 2)
- Clogged oil passages to the VVT solenoid
- Low or dirty engine oil
- Wiring harness issues (chafed, broken, corroded wires)
- Electrical connector problems
- Faulty Engine Control Module (ECM), though rare
Frequently reported on: Honda Accord (2008-2012), Toyota Camry (2007-2011), Nissan Altima (2007-2013), Chevrolet Malibu (2008-2012), Hyundai Sonata (2006-2010)
Diagnostic Steps
- Verify the P0028 code with an OBD-II scanner and check for other related codes.
- Inspect the engine oil level and condition; ensure it is clean and at the correct level.
- Visually inspect the wiring harness and electrical connector for the intake VVT solenoid on Bank 2 for any damage, corrosion, or loose connections.
- Test the resistance of the VVT solenoid using a multimeter, comparing it to manufacturer specifications.
- If necessary, replace the faulty intake VVT solenoid on Bank 2.
- Clear the code and test drive the vehicle to ensure the repair is successful.
👨🔧 When to Call a Professional
If after initial diagnostics you are unsure about the electrical testing or the physical replacement process, or if the code persists after replacing the solenoid, it's best to consult a certified mechanic. Complex electrical issues or underlying mechanical problems with the VVT system may require specialized diagnostic tools and expertise.
Commonly Asked Questions
What is Bank 2 and how do I find the intake VVT solenoid?
Bank 2 refers to the side of the engine that does not contain cylinder number 1. In V-type engines, this is usually the opposite bank from Bank 1. The intake VVT solenoid controls the intake camshaft timing. You may need to consult your vehicle's service manual for its exact location.
Can low or dirty oil cause a P0028 code?
Yes, absolutely. The variable valve timing system relies on clean engine oil at the correct pressure to operate correctly. Clogged oil passages or incorrect oil viscosity can prevent the solenoid from functioning properly, leading to this code.
Is it safe to drive with a P0028 code?
While not immediately critical, continued driving can result in reduced fuel economy, poor engine performance, and potentially lead to further engine damage over time if the underlying issue is not addressed. It's best to diagnose and repair it promptly.
How can I test the VVT solenoid before replacing it?
You can test the electrical resistance of the solenoid using a multimeter. Compare the reading to your vehicle's service manual specifications. You can also sometimes apply 12V directly to the solenoid (briefly) to hear if it clicks, indicating it's actuating.
What does "Range/Performance" mean in the code definition?
It means the Powertrain Control Module (PCM) detected that the voltage or resistance in the solenoid circuit is outside of the expected operating range, or that the solenoid itself is not performing its mechanical function as commanded (e.g., the cam timing is not changing as expected).