The P0027 code indicates a problem with the exhaust valve control solenoid circuit range/performance for Bank 1, a critical component in managing engine exhaust flow and optimizing performance. This code can lead to symptoms such as rough idle, loss of power, and even intermittent stalling, highlighting the importance of the exhaust valve control system in maintaining efficient engine operation and emissions control.
P0027 quick overview
| Meaning | P0027 – Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1 |
| Is it serious? | Yes, it can cause noticeable engine performance issues, affect fuel efficiency, and lead to increased emissions. |
| Possible causes | – Faulty exhaust valve control solenoid – Wiring or connector issues to the solenoid – Vacuum leaks in the intake system – Oil contamination around the solenoid – Issues with fuel delivery or ignition system components |
| How to diagnose? | Inspect wiring and connectors related to the exhaust valve control solenoid for damage or poor connections. Check for vacuum leaks in the intake system, especially on Bank 1, using a smoke test. Verify solenoid operation using diagnostic tools to ensure it functions within the specified range. Test fuel system components like fuel pressure, ignition coils, and spark plugs for related issues. |
P0027 Meaning
When the P0027 code is triggered, it indicates that the ECM has detected a discrepancy in the expected versus actual performance of the exhaust valve control solenoid. This solenoid plays a vital role in adjusting the timing of exhaust valve openings to optimize engine performance and reduce emissions.
Issues such as wiring faults, vacuum leaks, or a faulty solenoid itself can impede proper solenoid operation, resulting in decreased engine efficiency and increased emissions. Diagnosing this code requires a thorough examination of both the electrical circuitry associated with the solenoid and the mechanical operation of the valve control system.
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How to fix P0027 – learn from mechanics
I looked into P0027 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 P0027
Vehicle information 2012 Honda Accord 3.5L V6
Issue + repair history
- Experiencing rough idle and loss of power
- Previous repairs include replacing air filter and cleaning throttle body
- Current symptoms: CEL on, codes P0027 and P0171
Other OBD2 Codes + Test Results
- P0027: Exhaust Valve Control Solenoid Circuit Range/Performance B1
- P0171: System Too Lean (Bank 1)
Mechanic suggestions
- Inspect the wiring and connectors for the exhaust valve control solenoid
- Check for vacuum leaks in the intake system, particularly on Bank 1
- Verify proper operation of the exhaust valve control solenoid using a scan tool
- Perform a smoke test to identify any hidden vacuum leaks
Final fix
- Replaced faulty exhaust valve control solenoid and addressed vacuum leak on Bank 1, cleared codes, problem resolved.
Case #2: Ford P0027
Vehicle information 2018 Ford F-150 5.0L V8
Issue + repair history
- Experiencing intermittent stalling and rough idle
- Previous repairs include replacing fuel filter and cleaning mass airflow sensor
- Current symptoms: CEL on, codes P0027 and P0300
Other OBD2 Codes + Test Results
- P0027: Exhaust Valve Control Solenoid Circuit Range/Performance B1
- P0300: Random/Multiple Cylinder Misfire Detected
Mechanic suggestions
- Inspect the wiring harness and connectors for the exhaust valve control solenoid
- Check for any signs of oil contamination around the exhaust valve control solenoid
- Perform a fuel pressure test to ensure adequate fuel delivery
- Test the ignition coils and spark plugs for cylinder misfires
Final fix
- Replaced faulty exhaust valve control solenoid and addressed underlying fuel delivery issue, cleared codes, problem resolved.
Case #3: Toyota P0027
Vehicle information 2005 Toyota Camry 2.4L 4-cylinder
Issue + repair history
- Experiencing rough idle and lack of power
- Previous repairs include replacing spark plugs and cleaning fuel injectors
- Current symptoms: CEL on, codes P0027 and P0420
Other OBD2 Codes + Test Results
- P0027: Exhaust Valve Control Solenoid Circuit Range/Performance B1
- P0420: Catalyst System Efficiency Below Threshold (Bank 1)
Mechanic suggestions
- Check the exhaust system for leaks or damage, especially near the catalytic converter
- Test the exhaust gas recirculation (EGR) system for proper operation
- Inspect the wiring and connectors for the exhaust valve control solenoid
- Perform a compression test to check engine health
Final fix
- Replaced faulty exhaust valve control solenoid and addressed catalytic converter efficiency issue, cleared codes, problem resolved.
How to diagnose P0027
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 | Check for damaged wiring or poor connections to the solenoid. |
| Perform a smoke test | Identify any vacuum leaks in the intake system on Bank 1. |
| Verify solenoid operation | Use diagnostic tools to test the solenoid’s functionality. |
| Inspect fuel and ignition components | Ensure adequate fuel delivery and spark for combustion. |
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