The P0028 code points to an issue with the intake valve control solenoid circuit range/performance for Bank 2, suggesting that the solenoid’s performance is outside of the expected parameters set by the engine control module (ECM).
This code can lead to a range of engine performance problems, including rough idle, loss of power, and occasional stalling. The code reflects the ECM’s attempt to optimize engine breathing by adjusting the timing of the intake valves, crucial for maintaining efficient engine operation and emissions control.
P0028 quick overview
| Meaning | P0028 – Intake Valve Control Solenoid Circuit Range/Performance Bank 2 |
| Is it serious? | Yes, this code can result in noticeable engine performance issues and should be addressed promptly to avoid potential damage. |
| Possible causes | – Faulty intake valve control solenoid – Wiring or connector issues to the solenoid – Intake manifold leaks or damage – Incorrect timing belt/chain alignment on Bank 2 |
| How to diagnose? | Inspect the wiring harness and connectors for the intake valve control solenoid for any signs of damage or poor connections. Test the intake valve control solenoid to ensure it operates within the manufacturer’s specifications. Inspect the intake manifold for leaks or damage that could affect engine performance. Verify timing belt/chain alignment for Bank 2 to ensure proper engine timing and operation. |
P0028 Meaning
Triggering of the P0028 code indicates that the engine’s ECM has detected an issue with the operation of the intake valve control solenoid on Bank 2, potentially impacting the engine’s ability to breathe efficiently. The intake valve control solenoid is instrumental in adjusting the timing of the intake valves to optimize engine performance across different operating conditions.
Faults in the solenoid itself, its electrical connections, or related engine timing components can lead to reduced engine efficiency, performance issues, and increased emissions.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
How to fix P0028 – learn from mechanics
I looked into P0028 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: Honda P0028
Vehicle information 2010 Honda Accord 3.5L V6
Issue + repair history
- Experiencing rough idle and occasional stalling
- Previous repairs include replacing air filter and cleaning throttle body
- Current symptoms: CEL on, code P0028
Other OBD2 Codes + Test Results
- P0028: Intake Valve Control Solenoid Circuit Range/Performance B2
- No additional codes reported
- Live data shows irregular intake valve control solenoid operation
Mechanic suggestions
- Check the wiring harness and connectors for the intake valve control solenoid
- Test the intake valve control solenoid for proper resistance and operation
- Inspect the intake manifold for leaks or damage
- Verify timing belt/chain alignment for Bank 2
Final fix
- Replaced faulty intake valve control solenoid for Bank 2, cleared codes, problem resolved.
Case #2: Ford P0028
Vehicle information 2015 Ford Explorer 3.5L V6
Issue + repair history
- Experiencing rough idle and loss of power
- Previous repairs include replacing ignition coils and fuel injectors
- Current symptoms: CEL on, code P0028
Other OBD2 Codes + Test Results
- P0028: Intake Valve Control Solenoid Circuit Range/Performance B2
- P0306: Cylinder 6 Misfire Detected
- Live data shows irregular intake valve control solenoid operation
Mechanic suggestions
- Check for vacuum leaks in the intake system
- Inspect the intake valve control solenoid wiring and connectors
- Test the intake valve control solenoid for proper function
- Perform a compression test on Bank 2 cylinders
Final fix
- Replaced faulty intake valve control solenoid for Bank 2, addressed cylinder 6 misfire issue, cleared codes, problem resolved.
Case #3: Toyota P0028
Vehicle information 2017 Toyota Tacoma 4.0L V6
Issue + repair history
- Experiencing rough idle and hesitation during acceleration
- Previous repairs include replacing spark plugs and throttle body
- Current symptoms: CEL on, code P0028
Other OBD2 Codes + Test Results
- P0028: Intake Valve Control Solenoid Circuit Range/Performance B2
- P0305: Cylinder 5 Misfire Detected
- Live data shows irregular intake valve control solenoid operation
Mechanic suggestions
- Check for clogged or restricted fuel injectors
- Inspect the intake valve control solenoid wiring and connectors
- Test the intake valve control solenoid for proper resistance and operation
- Perform a compression test on Bank 2 cylinders
Final fix
- Replaced faulty intake valve control solenoid for Bank 2, addressed cylinder 5 misfire issue, cleared codes, problem resolved.
How to diagnose P0028
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
| Diagnostic Step | Explanation |
|---|---|
| Inspect wiring and connectors | Look for damage or poor connections in the solenoid’s electrical circuit. |
| Test solenoid operation | Verify that the solenoid functions within specified ranges. |
| Inspect the intake manifold | Check for any leaks or damage that could affect performance. |
| Verify engine timing | Ensure the timing belt or chain on Bank 2 is correctly aligned. |
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko