The OBD2 code P0084 points to an issue with the “Exhaust Valve Control Solenoid Circuit Bank 2,” signaling that the part of the engine managing how exhaust gases are released isn’t working correctly. This can lead to symptoms like engine hesitation, poor acceleration, or a rough idle.
P0084 quick overview
| Meaning | P0084: Exhaust Valve Control Solenoid Circuit Bank 2 |
| Is it serious? | Yes, it affects the engine’s performance and can lead to further issues if not addressed. |
| Possible causes | – Faulty exhaust valve control solenoid – Damage or wear in the wiring harness – Irregular voltage readings from the solenoid |
| How to diagnose? | Replace the faulty solenoid if needed. Inspect the wiring harness for damage. Check for vacuum leaks and engine health. |
P0084 Meaning
If your car shows a P0084 code, it means there’s a glitch with the part controlling the exhaust valves on one side of the engine. This can make your car run rough or feel slow.
Fixing it usually involves swapping out the solenoid that’s not working right and checking all the electrical connections to make sure they’re good. Sometimes, the problem can also be caused by leaks or other engine issues that need to be checked out.
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 P0084 – learn from mechanics
I looked into P0084 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: Chevrolet P0084
Vehicle information
2018 Chevrolet Silverado 1500 LTZ 6.2L V8
Issue + repair history
- Customer reported engine hesitation and poor acceleration
- Replaced exhaust valve control solenoid for bank 2
- Conducted thorough inspection of wiring harness for any signs of damage or wear
Other OBD2 Codes + Test Results
- DTC P0084: Exhaust valve control solenoid circuit bank 2
- No additional trouble codes present
- Live data revealed irregular voltage readings from exhaust valve control solenoid bank 2
Mechanic suggestions
- Checked for vacuum leaks (none detected)
- Verified proper functioning of camshaft position sensor
- Conducted a compression test to ensure engine health
Final fix
- Replacing the exhaust valve control solenoid for bank 2 resolved the issue
Case #2: Dodge P0084
Vehicle information
2016 Dodge Charger R/T 5.7L V8
Issue + repair history
- Complaints of engine misfire and rough idle
- Replaced exhaust valve control solenoid for bank 2
- Inspected wiring harness for any signs of damage or wear, none found
Other OBD2 Codes + Test Results
- DTC P0084: Exhaust valve control solenoid circuit bank 2
- No additional trouble codes present
- Live data showed erratic voltage readings from exhaust valve control solenoid bank 2
Mechanic suggestions
- Verified proper ground connections
- Checked for intake manifold leaks
- Inspected ignition system components for any faults
Final fix
- Replacing the exhaust valve control solenoid for bank 2 resolved the issue.
Case #3: Chevrolet P0084
Vehicle information
2018 Chevrolet Silverado 1500 LTZ 6.2L V8
Issue + repair history
- Customer complaint of rough idle and lack of power
- Replaced exhaust valve control solenoid for bank 2
- Conducted a compression test to check for internal engine issues, all cylinders within specification
Other OBD2 Codes + Test Results
- DTC P0084: Exhaust valve control solenoid circuit bank 2
- No other fault codes detected
- Live data showed inconsistent signal from exhaust valve control solenoid bank 2
Mechanic suggestions
- Inspected exhaust system for any restrictions or leaks
- Checked for vacuum leaks in the intake manifold
- Verified proper oil pressure to the variable valve timing system
Final fix
- Replacing the exhaust valve control solenoid for bank 2 resolved the issue, restoring engine performance and idle quality.
How to diagnose P0084
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 | Brief Explanation |
|---|---|
| Replace solenoid for bank 2 | Swaps out the malfunctioning part controlling exhaust flow. |
| Inspect wiring and connections | Checks for electrical issues that could disrupt solenoid function. |
| Check engine compression | Ensures the engine’s mechanical health isn’t affecting performance. |
| Look for vacuum and intake manifold leaks | Finds any leaks that could cause engine performance issues. |
| Verify proper oil pressure | Confirms adequate oil flow to variable valve timing components. |
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